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  • corporate headquarters : Building 5th, NO.1633 Jicheng Road, Tong'an District, Xiamen City, Fujian Province, China
  • business hours : 24/7-365 Customer Service
  • contact : Amy Wang
  • Email : tob.amy@tobmachine.com
  • phone : +86-18120715609
  • Whatsapp : +86-18120715609
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if you are interested in our products and our company!we hope to build up sincere friendship with you for a long time.
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  • Battery
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    Battery Materials
    TOB NEW ENERGY provides lithium ion battery materials include Cathode Materials, Anode Materials, Casing Materials, Battery Current Collectors, Conducive Materials, Graphene and Graphite Oxide, Binders, Battery Tabs, Battery Separator and Tape, Aluminum Laminate Film, Electrolyte, Pack Materials, Porous Metal Foam Materials, Nanomaterials and many others.
  • Coin
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    Coin Cell Equipment
    TOB New Energy provides professional coin cell lab equipment for lithium ion coin cell lab research, mainly include the small mixer device for slurry, manual film coating machine, electrode cutter, electrode press machine and crimping machine for coin cell sealing.  All the equipment suitable for all kinds of coin cells, such as CR2016, CR2025, CR2032, CR2430 and so on. Coin cell research is the most convenient way for powder materials analysis.
  • Dry
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    Dry Electrode Film Solution
    TOB New Energy dry electrode technology is to mix electrode active material, conductive agent and battery binder to get electrode powder, without using any solvent, then rolled the dry electrode powder into the electrode film. After that, according to the production process requirements, the film of dry electrode material was rolled to the appropriate thickness. Then, conductive adhesive coating on the current collector foil and drying it. The last, laminated the dry electrode film and current collector foil together to get the finished dry electrode.
  • Electrode
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    Electrode Preparation
    Electrode preparation from materials baking to spot welding process before battery cells finished. Including slurry mixing, slurry testing, electrode coating, electrode rolling press, notching and battery tab welding.
  • Cylindrical
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    Cylindrical Cell Assembly Machine
    From winding process to the last sealing process for 18650, 21700, 26650, 32650, 4680, 4690, cylindrical cell assemblY line.
  • Pouch
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    Pouch Cell Assembly Equipment
    From winding process to the last sealing process for pouch polymer cell assemble line.
  • Prismatic
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    Prismatic Cell Assembly Machine
    Aluminum Shell Cell Assembly Machine
  • Supercapacitor
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    Supercapacitor Equipment
    TOB can provide a set of supercapacitor solutions, including production line design and equipment supply.
  • Battery
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    Battery Tester
    Lithium ion Battery Testing Equipment is used for pouch cell, cylinder cell, coin cell parameter testing, it can test voltage, cycle life, capacitry and resistance.
  • Battery
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    Battery Production Line
    A full set of lithium battery producing equipment from mixing to last testing equipment, Including Manual machine, semi-auto battery machine and full auto battery machine.
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what we do for you
about us
WHAT WE DO? Xiamen TOB New Energy Technology Co., Ltd. is a high-tech enterprise specialized in high-end equipment of lithium-ion battery and supercapacitor. Our core technology team has over 20 years experience in lithium-ion battery researching and manufacturing.  TOB new energy was established in 2012, we have always been focusing on the development and operation of lithium-ion battery and its peripheral products. We provide advanced equipment and materials, professional and experienced battery manufacturing technology and comprehensive battery production line solutions for international companies and research institutions who work in lithium-ion battery sector. Our main products include Battery mixer, Electrode coating machine, Electrode slitting machine, Battery winding machine, Electrode stacking machine, Battery sealing and crimping machine, and Battery test system.  TOB adheres to strict quality control and thoughtful customer service, we have obtained the ISO9001 quality management system and C E certificates. Our clients include BMW, Mercedes Benz, A123, SKC, MIT, IIT, and many others. We have designed more than 200 lithium-ion battery and supercapacitor production lines for the companies located in United States, Europe, Russia, India, Korea, Southeast Asia, Australia and South America.  We warmly welcome customers around the world to establish cooperation and create a bright future with us together. We are not only selling the equipment or materials, but provide you an integrated battery solution.
300
+
engineers & workers
5000
+
clients in worldwide
100
+
projects completed
    our works
    latest projects
    We have designed more than 200 lithium-ion battery and supercapacitor production lines for the companies located in United States, Europe, Russia, India, Korea, Southeast Asia, Australia and South America.
    all projects
  • Sodium-ion Battery Lab Line Project
    Sodium-ion Battery Lab Line Project
    Project Name: Sodium-ion Battery Lab Line Project Description: Xiamen Tob New Energy Technology Co., Ltd. designs and establishes a sodium-ion battery lab line for the customer's laboratory, which can manufacture pouch cell, coin cell and 18650S/1.3Ah, 32138S/10Ah, 32140S /10Ah sodium-ion cell. Xiamen Tob New Energy Technology Co., Ltd. provides a complete set of battery manufacturing technology, production line equipment, raw materials, and various consumables. Date: May 2023 Location: China .container-t001 { max-width: 1000px; margin: 0 left; } .carousel { display: block; text-align: left; position: relative; margin-bottom: 50px; } .carousel > input { clip: rect(1px, 1px, 1px, 1px); clip-path: inset(100%); height: 1px; width: 1px; margin: -1px; overflow: hidden; padding: 0; position: absolute; } .carousel > input:nth-of-type(7):checked ~ .carousel__slides .carousel__slide:first-of-type { margin-left: -600%; } .carousel > input:nth-of-type(6):checked ~ .carousel__slides .carousel__slide:first-of-type { margin-left: -500%; } .carousel > input:nth-of-type(5):checked ~ .carousel__slides .carousel__slide:first-of-type { margin-left: -400%; } .carousel > input:nth-of-type(4):checked ~ .carousel__slides .carousel__slide:first-of-type { margin-left: -300%; } .carousel > input:nth-of-type(3):checked ~ .carousel__slides .carousel__slide:first-of-type { margin-left: -200%; } .carousel > input:nth-of-type(2):checked ~ .carousel__slides .carousel__slide:first-of-type { margin-left: -100%; } .carousel > input:nth-of-type(1):checked ~ .carousel__slides .carousel__slide:first-of-type { margin-left: 0%; } .carousel > input:nth-of-type(1):checked ~ .carousel__thumbnails li:nth-of-type(1) { box-shadow: 0px 0px 0px 5px rgba(40, 170, 130, 0.6); } .carousel > input:nth-of-type(2):checked ~ .carousel__thumbnails li:nth-of-type(2) { box-shadow: 0px 0px 0px 5px rgba(40, 170, 130, 0.6); } .carousel > input:nth-of-type(3):checked ~ .carousel__thumbnails li:nth-of-type(3) { box-shadow: 0px 0px 0px 5px rgba(40, 170, 130, 0.6); } .carousel > input:nth-of-type(4):checked ~ .carousel__thumbnails li:nth-of-type(4) { box-shadow: 0px 0px 0px 5px rgba(40, 170, 130, 0.6); } .carousel > input:nth-of-type(5):checked ~ .carousel__thumbnails li:nth-of-type(5) { box-shadow: 0px 0px 0px 5px rgba(40, 170, 130, 0.6); } .carousel > input:nth-of-type(6):checked ~ .carousel__thumbnails li:nth-of-type(6) { box-shadow: 0px 0px 0px 5px rgba(40, 170, 130, 0.6); } .carousel > input:nth-of-type(7):checked ~ .carousel__thumbnails li:nth-of-type(7) { box-shadow: 0px 0px 0px 5px rgba(40, 170, 130, 0.6); } .carousel__slides { position: relative; z-index: 1; padding: 0; margin: 0; overflow: hidden; white-space: nowrap; box-sizing: border-box; display: flex; } .carousel__slide { position: relative; display: block; flex: 0 0 100%; width: 100%; height: 100%; overflow: hidden; transition: all 300ms ease-out; vertical-align: top; box-sizing: border-box; white-space: normal; } .carousel__slide div:before { d...
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  • Cylindrical Supercapacitor Lab Line Project In Europe
    Cylindrical Supercapacitor Lab Line Project In Europe
    Project Name: Cylindrical Supercapacitor Lab Line Project Description: Xiamen Tob New Energy Technology Co., Ltd. has designed and established a cylindrical supercapacitor lab line for European customers. TOB provides a complete set of supercapacitor production technology, production line design, supercapacitor lab line equipment, raw materials, and various consumables. The entire supercapacitor lab line will be installed and debugged by TOB engineers at the customer's factory, and training will be provided on the use and maintenance of the equipment until it reaches the acceptance standards. Date: 2023 - 2024 Location: Europe .container-t001 { max-width: 1000px; margin: 0 left; } .carousel { display: block; text-align: left; position: relative; margin-bottom: 50px; } .carousel > input { clip: rect(1px, 1px, 1px, 1px); clip-path: inset(100%); height: 1px; width: 1px; margin: -1px; overflow: hidden; padding: 0; position: absolute; } .carousel > input:nth-of-type(7):checked ~ .carousel__slides .carousel__slide:first-of-type { margin-left: -600%; } .carousel > input:nth-of-type(6):checked ~ .carousel__slides .carousel__slide:first-of-type { margin-left: -500%; } .carousel > input:nth-of-type(5):checked ~ .carousel__slides .carousel__slide:first-of-type { margin-left: -400%; } .carousel > input:nth-of-type(4):checked ~ .carousel__slides .carousel__slide:first-of-type { margin-left: -300%; } .carousel > input:nth-of-type(3):checked ~ .carousel__slides .carousel__slide:first-of-type { margin-left: -200%; } .carousel > input:nth-of-type(2):checked ~ .carousel__slides .carousel__slide:first-of-type { margin-left: -100%; } .carousel > input:nth-of-type(1):checked ~ .carousel__slides .carousel__slide:first-of-type { margin-left: 0%; } .carousel > input:nth-of-type(1):checked ~ .carousel__thumbnails li:nth-of-type(1) { box-shadow: 0px 0px 0px 5px rgba(40, 170, 130, 0.6); } .carousel > input:nth-of-type(2):checked ~ .carousel__thumbnails li:nth-of-type(2) { box-shadow: 0px 0px 0px 5px rgba(40, 170, 130, 0.6); } .carousel > input:nth-of-type(3):checked ~ .carousel__thumbnails li:nth-of-type(3) { box-shadow: 0px 0px 0px 5px rgba(40, 170, 130, 0.6); } .carousel > input:nth-of-type(4):checked ~ .carousel__thumbnails li:nth-of-type(4) { box-shadow: 0px 0px 0px 5px rgba(40, 170, 130, 0.6); } .carousel > input:nth-of-type(5):checked ~ .carousel__thumbnails li:nth-of-type(5) { box-shadow: 0px 0px 0px 5px rgba(40, 170, 130, 0.6); } .carousel > input:nth-of-type(6):checked ~ .carousel__thumbnails li:nth-of-type(6) { box-shadow: 0px 0px 0px 5px rgba(40, 170, 130, 0.6); } .carousel > input:nth-of-type(7):checked ~ .carousel__thumbnails li:nth-of-type(7) { box-shadow: 0px 0px 0px 5px rgba(40, 170, 130, 0.6); } .carousel__slides { position: relative; z-index: 1; padding: 0; margin: 0; overflow: hidden; white-space: nowrap; box-sizing: border-box; display: flex; } .carousel__slide { position: relative; display: block; flex: 0 0 100%; width: 100%; height: 100%; overflow: hi...
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  • 60138 Supercapacitor Pilot Line Project
    60138 Supercapacitor Pilot Line Project
    Project Name: 60138( Dia:60mm,Height:138mm),3000F Super-Capacitor Pilot Line Project Description: Xiamen TOB New Energy Technology Co., Ltd. designs and builds a 60138 super- capacitor pilot line for our southeast Asia customers. TOB NEW ENERGY provide a full set of super-capacitor production equipment, testing equipment and materials. TOB New Energy send engineers to the customer's factory for equipment debugging until the super-capacitor production line can run normally. After the project is completed, supply good after sales service to promise the line running stable. Date: 2022 - 2023 Location: Southeast Asia .container-t001 { max-width: 1000px; margin: 0 left; } .carousel { display: block; text-align: left; position: relative; margin-bottom: 50px; } .carousel > input { clip: rect(1px, 1px, 1px, 1px); clip-path: inset(100%); height: 1px; width: 1px; margin: -1px; overflow: hidden; padding: 0; position: absolute; } .carousel > input:nth-of-type(12):checked ~ .carousel__slides .carousel__slide:first-of-type { margin-left: -1100%; } .carousel > input:nth-of-type(11):checked ~ .carousel__slides .carousel__slide:first-of-type { margin-left: -1000%; } .carousel > input:nth-of-type(10):checked ~ .carousel__slides .carousel__slide:first-of-type { margin-left: -900%; } .carousel > input:nth-of-type(9):checked ~ .carousel__slides .carousel__slide:first-of-type { margin-left: -800%; } .carousel > input:nth-of-type(8):checked ~ .carousel__slides .carousel__slide:first-of-type { margin-left: -700%; } .carousel > input:nth-of-type(7):checked ~ .carousel__slides .carousel__slide:first-of-type { margin-left: -600%; } .carousel > input:nth-of-type(6):checked ~ .carousel__slides .carousel__slide:first-of-type { margin-left: -500%; } .carousel > input:nth-of-type(5):checked ~ .carousel__slides .carousel__slide:first-of-type { margin-left: -400%; } .carousel > input:nth-of-type(4):checked ~ .carousel__slides .carousel__slide:first-of-type { margin-left: -300%; } .carousel > input:nth-of-type(3):checked ~ .carousel__slides .carousel__slide:first-of-type { margin-left: -200%; } .carousel > input:nth-of-type(2):checked ~ .carousel__slides .carousel__slide:first-of-type { margin-left: -100%; } .carousel > input:nth-of-type(1):checked ~ .carousel__slides .carousel__slide:first-of-type { margin-left: 0%; } .carousel > input:nth-of-type(1):checked ~ .carousel__thumbnails li:nth-of-type(1) { box-shadow: 0px 0px 0px 5px rgba(40, 170, 130, 0.6); } .carousel > input:nth-of-type(2):checked ~ .carousel__thumbnails li:nth-of-type(2) { box-shadow: 0px 0px 0px 5px rgba(40, 170, 130, 0.6); } .carousel > input:nth-of-type(3):checked ~ .carousel__thumbnails li:nth-of-type(3) { box-shadow: 0px 0px 0px 5px rgba(40, 170, 130, 0.6); } .carousel > input:nth-of-type(4):checked ~ .carousel__thumbnails li:nth-of-type(4) { box-shadow: 0px 0px 0px 5px rgba(40, 170, 130, 0.6); } .carousel > input:nth-of-type(5):checked ~ .carousel__thumbnails li:nth-of-type(5) { box-shadow: 0px 0px 0px 5px r...
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  • Dry Electrode Supercapacitor Production Line
    Dry Electrode Supercapacitor Production Line
    Project Name: Dry Electrode Supercapacitor Production Line Description: XIAMEN TOB NEW ENERGY TECHNOLOGY CO., LTD. designed and established a 60138 supercapacitor production line which is using dry electrode process for the customer's battery factory, and TOB New Energy provides a full set of production technology, production line equipment, raw materials and supplies of various consumables. Date: From January 2021 to January 2023 Location: North America .container-t001 { max-width: 1000px; margin: 0 left; } .carousel { display: block; text-align: left; position: relative; margin-bottom: 50px; } .carousel > input { clip: rect(1px, 1px, 1px, 1px); clip-path: inset(100%); height: 1px; width: 1px; margin: -1px; overflow: hidden; padding: 0; position: absolute; } .carousel > input:nth-of-type(6):checked ~ .carousel__slides .carousel__slide:first-of-type { margin-left: -500%; } .carousel > input:nth-of-type(5):checked ~ .carousel__slides .carousel__slide:first-of-type { margin-left: -400%; } .carousel > input:nth-of-type(4):checked ~ .carousel__slides .carousel__slide:first-of-type { margin-left: -300%; } .carousel > input:nth-of-type(3):checked ~ .carousel__slides .carousel__slide:first-of-type { margin-left: -200%; } .carousel > input:nth-of-type(2):checked ~ .carousel__slides .carousel__slide:first-of-type { margin-left: -100%; } .carousel > input:nth-of-type(1):checked ~ .carousel__slides .carousel__slide:first-of-type { margin-left: 0%; } .carousel > input:nth-of-type(1):checked ~ .carousel__thumbnails li:nth-of-type(1) { box-shadow: 0px 0px 0px 5px rgba(40, 170, 130, 0.6); } .carousel > input:nth-of-type(2):checked ~ .carousel__thumbnails li:nth-of-type(2) { box-shadow: 0px 0px 0px 5px rgba(40, 170, 130, 0.6); } .carousel > input:nth-of-type(3):checked ~ .carousel__thumbnails li:nth-of-type(3) { box-shadow: 0px 0px 0px 5px rgba(40, 170, 130, 0.6); } .carousel > input:nth-of-type(4):checked ~ .carousel__thumbnails li:nth-of-type(4) { box-shadow: 0px 0px 0px 5px rgba(40, 170, 130, 0.6); } .carousel > input:nth-of-type(5):checked ~ .carousel__thumbnails li:nth-of-type(5) { box-shadow: 0px 0px 0px 5px rgba(40, 170, 130, 0.6); } .carousel > input:nth-of-type(6):checked ~ .carousel__thumbnails li:nth-of-type(6) { box-shadow: 0px 0px 0px 5px rgba(40, 170, 130, 0.6); } .carousel__slides { position: relative; z-index: 1; padding: 0; margin: 0; overflow: hidden; white-space: nowrap; box-sizing: border-box; display: flex; } .carousel__slide { position: relative; display: block; flex: 0 0 100%; width: 100%; height: 100%; overflow: hidden; transition: all 300ms ease-out; vertical-align: top; box-sizing: border-box; white-space: normal; } .carousel__slide div:before { display: block; content: ""; width: 100%; padding-top: 60%; } .carousel__slide div > img { position: absolute; top: 0; left: 0; right: 0; bottom: 0; width: 100%; height: 100%; } .carousel__thumbnails { list-style: none; padding: 0; margin: 0; display: flex; margin: 0 -10px; } .carousel__slides +...
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  • Projects for Lithium ion Pouch Cell Lab Scale Line Building in Brazil
    Projects for Lithium ion Pouch Cell Lab Scale Line Building in Brazil
    Project Name: Projects for Lithium ion pouch cell lab scale line building Description: Xiamen TOB New Energy Technology Co., Ltd. designed a lithium-ion pouch cell lab line for the customer's battery laboratory, and TOB New Energy also provided a complete set of the battery lab equipment and some raw materials for their research. Date: 2020 Location: Brazil .container-t001 { max-width: 1000px; margin: 0 left; } .carousel { display: block; text-align: left; position: relative; margin-bottom: 50px; } .carousel > input { clip: rect(1px, 1px, 1px, 1px); clip-path: inset(100%); height: 1px; width: 1px; margin: -1px; overflow: hidden; padding: 0; position: absolute; } .carousel > input:nth-of-type(6):checked ~ .carousel__slides .carousel__slide:first-of-type { margin-left: -500%; } .carousel > input:nth-of-type(5):checked ~ .carousel__slides .carousel__slide:first-of-type { margin-left: -400%; } .carousel > input:nth-of-type(4):checked ~ .carousel__slides .carousel__slide:first-of-type { margin-left: -300%; } .carousel > input:nth-of-type(3):checked ~ .carousel__slides .carousel__slide:first-of-type { margin-left: -200%; } .carousel > input:nth-of-type(2):checked ~ .carousel__slides .carousel__slide:first-of-type { margin-left: -100%; } .carousel > input:nth-of-type(1):checked ~ .carousel__slides .carousel__slide:first-of-type { margin-left: 0%; } .carousel > input:nth-of-type(1):checked ~ .carousel__thumbnails li:nth-of-type(1) { box-shadow: 0px 0px 0px 5px rgba(40, 170, 130, 0.6); } .carousel > input:nth-of-type(2):checked ~ .carousel__thumbnails li:nth-of-type(2) { box-shadow: 0px 0px 0px 5px rgba(40, 170, 130, 0.6); } .carousel > input:nth-of-type(3):checked ~ .carousel__thumbnails li:nth-of-type(3) { box-shadow: 0px 0px 0px 5px rgba(40, 170, 130, 0.6); } .carousel > input:nth-of-type(4):checked ~ .carousel__thumbnails li:nth-of-type(4) { box-shadow: 0px 0px 0px 5px rgba(40, 170, 130, 0.6); } .carousel > input:nth-of-type(5):checked ~ .carousel__thumbnails li:nth-of-type(5) { box-shadow: 0px 0px 0px 5px rgba(40, 170, 130, 0.6); } .carousel > input:nth-of-type(6):checked ~ .carousel__thumbnails li:nth-of-type(6) { box-shadow: 0px 0px 0px 5px rgba(40, 170, 130, 0.6); } .carousel__slides { position: relative; z-index: 1; padding: 0; margin: 0; overflow: hidden; white-space: nowrap; box-sizing: border-box; display: flex; } .carousel__slide { position: relative; display: block; flex: 0 0 100%; width: 100%; height: 100%; overflow: hidden; transition: all 300ms ease-out; vertical-align: top; box-sizing: border-box; white-space: normal; } .carousel__slide div:before { display: block; content: ""; width: 100%; padding-top: 50%; } .carousel__slide div > img { position: absolute; top: 0; left: 0; right: 0; bottom: 0; width: 100%; height: 100%; } .carousel__thumbnails { list-style: none; padding: 0; margin: 0; display: flex; margin: 0 -10px; } .carousel__slides + .carousel__thumbnails { margin-top: 10px; } .carousel__thumbnails li { flex: 1 1 auto; max-width: ...
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testimonials
what customers said
Great experience with TOB NEW ENERGY. l found the machines l was looking for on their website. They quickly confirmed that it was available and shipped it. l worked with Gavin. Gavin was very professional, helpful, and easy to work with. Process was easy and smooth.
Brian Howie
Brian Howie
eco systcm
It is a pleasure doing business with supplier. Great communication and fast delivery! I ordered this coating machine and its quality is very good. I really appreciate the people who worked behind delivering the product from China to my place.
Olivia Silva
Olivia Silva
eco systcm
I chose TOB because I simply could not find any other provider that offered all the materials I needed under one platform, such NCA, NMC,graphene oxide powder,etc. I really liked the speed of the supplier and quality of the product.
Marry Smith
Marry Smith
eco systcm
We developed a great partnership with TOB New Energy and their dedication to our researching is evident in all aspects of the lab. We appreciate their attention to detail and creative approach to bringing our new inspiration to move forward.
Joe Deer
Joe Deer
eco systcm
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latest news
Analysis Approach for Low Capacity Issue of Battery Cells
Analysis Approach for Low Capacity Issue of Battery Cells Apr 15, 2025
Analysis Approach for Low Capacity Issue of Battery Cells
The determination of low battery capacity (low capacity) for battery cells is based on a straightforward comparison between the post-formation (post-charging/discharging cycle) capacity and the designed capacity value. If the capacity measured after the formation process is lower than the designed value, the first response should be to confirm whether there are errors in the formation process settings (such as discharge current, charging time, cut-off voltage, and formation temperature). ①If the formation step settings are correct, it is necessary to change the testing point and re-perform the formation process on the battery cell to check if there are issues with the formation equipment or channels. ②Assuming no abnormalities are found in the formation data after changing the equipment, then the original equipment is likely problematic. ③If the re-test still shows low capacity, it can be confirmed that the low-capacity issue truly exists. After confirming the existence of low capacity, it is necessary to further determine the frequency and severity of the low-capacity occurrences to grasp the actual situation of low capacity from an overall perspective. This requires a more systematic approach. Before conducting a systematic analysis, it is advisable to first disassemble the re-charged low-capacity battery cells to inspect the interface. If no issues are found, it is likely due to insufficient positive electrode coating weight or inadequate design margin. If there are interface problems, it may be due to other issues in the manufacturing process or design. Next, we will investigate the causes of low capacity from the design end and the process manufacturing end. I. Design End Material system compatibility: In particular, the compatibility between the negative electrode and electrolyte has a significant impact on battery cell capacity. For newly introduced negative electrodes or electrolytes, if repeated tests show that each battery cell experiences lithium plating and low capacity, there is a high likelihood of material mismatch. The reasons for mismatch may include: ①Inadequate density, thickness, or instability of the SEI (Solid Electrolyte Interphase) film formed during formation; ②Possible delamination of the graphite layer caused by PC (propylene carbonate) in the electrolyte; ③Excessively high designed areal density or compaction density, making the battery cell unable to adapt to high-rate charging and discharging. Adequacy of capacity design margin: ①Starting from the gravimetric capacity of the positive electrode material: Due to errors in positive/negative electrode coating, formation cabinet accuracy, and adhesive effects on capacity, a certain capacity margin must be reserved during design. For new materials, accurate assessment of the gravimetric capacity of the positive electrode in the specific system is crucial. The same positive electrode material may not exhibit the same gravimetric capacity when paired with different negative ...
  • What is COV in lithium-ion battery coating？
    What is COV in lithium-ion battery coating？
    What is COV in lithium-ion battery coating？ Mar 26, 2025
    What is COV The COV (Coefficient of Variation) in lithium-ion battery coating is a statistical indicator used to quantify the consistency of the coating process. It is calculated using the formula: COV = (Standard Deviation σ / Mean) × 100%. By eliminating differences in dimensions, this indicator reflects the dispersion degree of the dataset. A lower COV value indicates better coating uniformity. How to Evaluate Coating Quality Using COV Evaluation of Coating Surface Density Consistency The COV directly reflects the degree of fluctuation in coating surface density. For example, a COV of 0.5% for coating surface density indicates that the standard deviation of the data is 0.5% of the mean value. Industry standards are as follows: COV ≤ 0.3%: Extremely high surface density consistency. 0.3% < COV < 0.5%: Current mainstream level. COV > 0.5%: Process optimization is required. This indicator directly impacts cell capacity design. For instance, with a COV of 0.5%, a 3σ corresponds to a fluctuation of 1.5%, and the minimum cell capacity design needs to be set at 98.5% of the mean value. Analysis of AB Surface Coating Uniformity By using in-situ resistance testing methods (such as the BER2500 device), the resistance of the A-side, B-side, and total through-resistance of the electrode are measured respectively, and the COV value of each resistance is calculated. The larger the COV, the more uneven the distribution of the conductive network in the coating. For example, in a double-sided coating process, if there is a significant difference in the COV of AB surface resistance, it may be due to uneven distribution of conductive agents caused by slurry sedimentation or different drying rates, which may further lead to lithium plating or reduced cycle life of the battery. Optimization Directions for Process Parameters Slurry Stability: Changes in slurry viscosity and solid content directly affect the coating COV. It is necessary to ensure that the slurry has no sedimentation and stable fluidity. Drying Control: Excessively high or low temperatures can cause coating cracks or incomplete drying, affecting surface density consistency. Equipment Precision: Slit extrusion coating technology is more suitable for reducing COV due to its closed system and high-precision control. Precautions Sensitivity to Extreme Values: COV is susceptible to outliers. It is necessary to combine data cleaning or supplement other indicators (such as CPK) for comprehensive evaluation. Multidimensional Verification: In addition to surface density, it is recommended to combine COV values of resistance, thickness, and other parameters to comprehensively evaluate coating quality.
  • In the rolling process, why does the positive electrode use hot rollers and the negative electrode uses cold pressing?
    In the rolling process, why does the positive electrode use hot rollers and the negative electrode uses cold pressing?
    In the rolling process, why does the positive electrode use hot rollers and the negative electrode uses cold pressing? Mar 07, 2025
    This is mainly due to three reasons: differences in material characteristics between the cathode and anode, varying process effects and performance requirements, and different temperature sensitivities of binders. 1.Differences in Material Characteristics Between Cathode and Anode The cathode materials (such as LiFePO4, NCM) are hard and poorly conductive, and hot rolling can effectively enhance the compaction effect: the high hardness of particles leads to high compaction resistance (the compaction resistance of the cathode is four times that of the anode), and hot rolling softens the PVDF binder to enhance the bonding force between the active material and the current collector. Hot rolling can reduce pole piece rebound by about 50%, reduce rolling force by up to 62% (depending on the specific material system and process capabilities), and simultaneously improve the distribution of conductive agents, enhancing electron conduction efficiency. The anode's graphite is low in hardness and prone to plastic deformation, but excessive compaction can easily lead to particle crushing: secondary cold rolling adjusts thickness and pore structure in stages, reducing stress concentration and avoiding particle fracture caused by a single high pressure. Secondary rolling can make the pore distribution more uniform, reducing the expansion rate from 5.00% to 4.47% after cycling and improving cycle stability. 2.Process Effects and Performance Requirements Optimization of cathode hot rolling: Hot rolling at 100°C significantly reduces pole piece resistance (by 2.1%) and thickness rebound rate (by 50%), while increasing the peak peel strength. Hot rolling requires less rolling force when thinning pole pieces, and thickness uniformity is easier to control (uniformity of roller surface temperature is required to be high, as it deteriorates at 120°C). Advantages of anode secondary cold rolling: Secondary cold rolling gradually increases compaction density, avoiding a decrease in peel strength caused by a single high pressure (e.g., peel strength after one-time rolling is 0.298N vs. remaining stable at 0.298N after secondary rolling). The lateral and longitudinal elongation rates stabilize at 0.27% and 1.17%, respectively, reducing the risk of pole piece cracking. 3.Binder and Temperature Sensitivity The cathode's PVDF maintains good viscosity at high temperatures (40~150°C), and hot rolling promotes crosslinking with active substances, enhancing bonding strength. The anode's aqueous binder (such as CMC/SBR) is heat-sensitive, and high temperatures may cause degradation. Cold rolling maintains chemical stability, avoiding a decrease in peel strength. Due to the cathode's hardness and poor conductivity, hot rolling is required to improve compaction and electrical performance; anode secondary cold rolling balances the need for plastic deformation with structural integrity, avoiding particle crushing and stabilizing peel strength. The differences in processes between the ...
  • What is the problem with solid-state batteries?
    What is the problem with solid-state batteries?
    What is the problem with solid-state batteries? Feb 18, 2025
    What are solid-state batteries? Solid-state batteries are a type of battery that uses solid electrolytes to replace traditional liquid or gel-type electrolytes. Compared to conventional lithium-ion batteries, solid-state batteries have a more stable structure, offering higher energy density, safer performance, and faster charging speed. The main problems with solid-state batteries: Technical Aspects Low ionic conductivity: The strong interaction between ions and high migration energy barriers in solid electrolytes result in lower ionic conductivity compared to liquid electrolytes, leading to slow charging and discharging rates and rapid capacity fading. Lithium dendrite growth: Even with solid electrolytes of high mechanical strength, it is difficult to completely inhibit the growth of lithium dendrites, which can form on the surface of the negative electrode and even penetrate through the solid electrolyte, causing battery short circuits. Solid-solid interface issues: The solid-solid interface in solid-state batteries has a small contact area, and volume changes during electrode charging and discharging can disrupt the interface structure, worsening contact, increasing interface impedance, and potentially causing chemical reactions to form unstable interface layers. Mechanical performance challenges: Solid materials in solid-state batteries are more prone to cracking when subjected to mechanical stress, such as during battery assembly or during vibrations or collisions in use, affecting battery performance and safety. Poor low-temperature performance: Solid-state batteries may experience more pronounced performance degradation in low-temperature environments, affecting their use in cold regions. Cost Aspects High material costs: Expensive materials such as lithium metal and special ceramic electrolytes, including high-priced lithium sulfide, are typically used, resulting in costs significantly higher than those of liquid lithium batteries. High manufacturing costs: The production process is complex, requiring precision processes and equipment, such as high-density stacking and high-precision electrolyte coating, as well as special production environments, with low production efficiency, leading to higher manufacturing costs. Environmental and Recycling Aspects Resource and energy consumption issues: From raw material extraction, processing, to manufacturing, significant natural resources and energy are consumed. The mining and refining of new materials can damage the environment, and the high energy consumption during production increases carbon emissions. Recycling challenges: The recycling and disposal of discarded solid-state batteries pose challenges. Their internal structures are complex, containing multiple metals and chemicals. Improper recycling can pollute the environment, and recycling technologies and processes are immature and costly.

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