New progress in power battery charging safety warning

With the rapid growth of the number of new energy vehicles, the power battery safety accident has become one of the key bottlenecks restricting the rapid development of new energy vehicles, and it also seriously threatens the personal safety of the occupants. power battery chargingFigure 1 : Lithium polymer battery making process for cylindrical cells Under the strong support of the national key research and development plan “new energy vehicle” special “electric vehicle infrastructure operation safety and interconnection technology” project, the project research team of Guodian NARI Technology Co., Ltd. proposed a multi-time scale lithium ion battery. The charging safety hazard warning method establishes an interactive response mechanism for electric vehicles and charging infrastructure and integrated monitoring platform. The breakthrough of key technologies will greatly improve the safety and reliability of power battery applications. The project carried out the thermal runaway mechanism under the condition of power battery overcharge and the performance attenuation mechanism under different stresses, and established a relatively complete power battery safety characteristic parameter characterization system; Comprehensively utilizing real-time and historical operational data of vehicles, applying data mining technology to analyze the coupling characteristics of power battery characteristic parameters and safety hazards, and establishing a monitoring method for safe operation of power battery system; Based on the characteristic parameters of the capacity increment curve, a power battery health state diagnosis method based on support vector machine is established, which realizes the identification of the power battery degradation mode. Aiming at the problem of safety hazard caused by sudden change of high-energy power battery capacity, the development of capacity-accelerated recession recognition and early warning technology based on quantile regression is combined with battery health assessment, accelerated recession identification and real-time operation of battery to form a multi-time scale. Power battery safety risk assessment and early warning methods effectively improve the safety and reliability of power battery use. TOB NEW ENERGY which has 15 years experience in lithium battery industry. We supply full kinds of lithium battery making equipment and material, we have ability to build lithium battery production line for our clients. We have cooperated with many famous company, such as Apple, Sumsang, 3M, SKC etc. Welcome to join us! Contact: Mr.Runner(Sales & Engineer ) Email: tob.runner@tobmachine.com Whatsapp: +86 15980946320 Skype: tob.runner@tobmachine.com Wechat: TOB-009

New iron trifluoride cathode boosts lithium battery storage capacity by 3 times

Recently, the University of Maryland, the National Laboratory of the Department of Energy and the US military researchers have developed a new type of cathode nanomaterial lithium battery, which has three times the energy density of existing commercial lithium batteries. The research results were published in Natural Communication. “Journal.

With the increasing use of lithium batteries, the demand for high energy density batteries is also growing. However, in a conventional commercial lithium battery, the anode material is usually a good conductive material such as graphite, but the capacity of the cathode material is very limited. Fan Xiulin, a researcher at the University of Maryland, one of the main authors of the paper, said, “Cathode materials are the bottleneck in lithium battery research. It is very difficult to improve battery energy density based on this.”

To solve this problem, researchers from various institutions in the United States have synthesized an engineered iron trifluoride (FeF3) that has higher energy density and is environmentally friendly.
Lithium Battery MaterialsIn fact, iron trifluoride materials have not been used as cathode materials for lithium batteries. When an electrode reaction occurs, iron trifluoride obtains electrons derived from lithium and is converted into iron and lithium fluoride. Since this compound has a certain hysteresis effect, the rate is low in the electrode reaction, and its reaction by-products also hinder the electrode reaction from proceeding. In addition, this reaction is not completely reversible, which means that the number of cycles of the iron trifluoride electrode reaction is very limited, and the economic performance of the battery is greatly reduced.

In response to these problems, the researchers discovered the mechanism of this electrode reaction from a microscopic level through a large number of experimental studies. Using a transmission electron microscope (TEM), the researchers determined the true size of the cathode nanomaterial and observed structural changes during its charge and discharge. Since then, the researchers used X-ray powder diffraction (XPD) technology to observe the crystal structure in the nanorods, and found that adding other atoms can effectively increase the reaction rate. Therefore, the research team used a chemical substitution method to add cobalt atoms and oxygen atoms to the iron trifluoride nanorods, which changed the reaction mechanism, which made the electrode reaction of iron trifluoride reversible and greatly increased the battery life.

TOB NEW ENERGY which has 15 years experience in lithium battery industry. We supply full kinds of lithium battery making equipment and material, we have ability to build lithium battery production line for our clients. We have cooperated with many famous company, such as Apple, Sumsang, 3M, SKC etc.

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Lithium battery electrode material breakthrough, battery may become smaller

As the most widely used rechargeable battery at the moment, lithium ion batteries have a very high energy density. Tin, silicon and other non-carbon materials are expected to replace the current commercial graphite oxide powder as a new generation of anode electrode materials, significantly increasing the mass energy density of lithium-ion batteries (Whkg-1), but its huge volume expansion has severely limited its volumetric performance advantages.

The carbon cage structure constructed of carbon nanomaterials is considered to be the main means to solve the problem of large volume expansion when the non-carbon anode electrode material is intercalated with lithium; however, in the process of constructing the carbon buffer network, too many reserved spaces are often introduced, resulting in the electrode materials The density is greatly reduced, which limits the anode volume performance of lithium-ion batteries.

Prof. Yang Quanhong’s research team has made breakthroughs in the design of anode materials for high-volume energy density lithium-ion batteries. Based on the assembly of graphene interfaces, he invented the precise and customized sulfur template technology for dense porous carbon cages. In the process of constructing a dense graphene network using capillary evaporation technology, they introduced sulfur as a flowable volume template to complete the customization of the graphene carbon coating for non-carbon active particles.

By adjusting the amount of sulfur template used, the three-dimensional graphene carbon cage structure can be precisely controlled to realize the “fitting” of the non-carbon active particle size, thereby acting as a lithium on the basis of effectively buffering the large volume expansion of the non-carbon active particles intercalating lithium. The lithium ion battery anode shows excellent volume properties.
Conductivity type graphene powderThe sulphur template method is proposed in the three-dimensional graphene dense network, and uses the sulfur as the “Transformers”-like fluidity, amorphous, and easy to remove, to achieve non-carbon active particles in the carbon cage structure. Tin oxide nanoparticles tightly coated.

This kind of carbon-non-carbon composite electrode material having a suitable reserved space and maintaining a high density can contribute a very high volumetric capacity, thereby greatly increasing the volumetric energy density of the lithium ion battery and making the lithium ion battery smaller.

TOB NEW ENERGY which has 15 years experience in lithium battery industry. We supply full kinds of lithium battery making equipment and material, we have ability to build lithium battery production line for our clients. We have cooperated with many famous company, such as Apple, Sumsang, 3M, SKC etc.

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The Floating Problem of PVDF Binder During the Drying Process of the Electrode and Its Solution

The coating process is an important step in the manufacturing process of the lithium battery electrode, and it is the process of transferring the electrode slurry from the liquid state to the electrode solid living substance. After the electrode slurry is prepared, it is passed through a screw pump, a filter, a screen, or the like, and is coated on the current collector after being coated via an extrusion coating head or a transfer roll. After oven drying, the liquid slurry solidifies on the surface of the current collector and has stronger adhesion.

In the oven drying process, there is no obvious anomaly on the surface, but during the rolling process after coating, it is sometimes found that after the battery electrode passes over the roller, the material drop, the leakage foil, or the pressure roller abnormally darkens. phenomenon.

This may not be due to a problem with the binder ratio during the preparation of the electrode paste, but may be due to the fact that the binder floats to the surface during drying of the electrode coating.

1.The reason for the binder floating
Lithium-ion battery pastes are mainly composed of active materials and conductive agent particles, solvents, binders, etc. In the process of drying, surface temperature and internal temperature of the electrodes will form a slight temperature gradient, and the surface temperature will be higher than the internal temperature.

During the drying process, the surface is first dried and the concentration of the substance is higher than the internal concentration. Under such a driving force, the binder in the electrode gradually migrates to the surface as the solvent volatilizes, and precipitates on the surface of the active material and the conductive agent. Therefore, the drying process will affect the pore structure and binder distribution of the electrode.

The reasons for the binder floating are mainly the drying rate is too fast and the oven temperature range is set unreasonably.

2.Disadvantages of binder floating
After the slurry coating is completed, the product needs to be inspected. The inspection items are generally pole load, electrode thickness, peel strength, resistivity, etc., and may also evaluate the Lipf6 electrolyte infiltration effect of the electrode. The float of the adhesive will reduce the peel strength of the battery electrode.

3.How to lower the adhesive float
The effect of drying temperature and oven setting on the peel strength of the electrode is shown in Fig. 1:
PVDF floating problem analyzeFigure1: Comparison of peeling strength of cathode electrode at different temperature intervals

In the figure, the Z axis is the peel strength value, the X axis is the temperature range distribution, and the Y axis is the interval temperature setting. Here, the 2/2 on the X-axis represents the drying section consisting of a four-section oven, where the vacuum drying oven temperature setting is the same for each two sections.

In order to prevent the floating problem of the binder in the drying process, the control of the temperature zone will select a three- or four-stage or even multi-stage temperature gradient distribution, generally low temperature to prevent the sprayed electrode from drying after entering the high temperature zone. The defect caused by the fast, interruption is the high temperature range. In this interval, PVDF has a high degree of crystallinity, has a good adhesion, and has a positive effect on the internal resistance and cycle performance of the manufactured battery.

TOB NEW ENERGY which has 15 years experience in lithium battery industry. We supply full kinds of lithium battery making equipment and material, we have ability to build lithium battery production line for our clients. We have cooperated with many famous company, such as Apple, Sumsang, 3M, SKC etc.

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France develops carbon nanotubes 30% lighter than lithium-ion battery packs

Recently, according to foreign media reports, the French company NAWA Technology is developing a supercapacitor based on nanotechnology – carbon nanotubes, its biggest feature is that in the case of ensuring the performance of electric vehicle battery power, compared to lithium-ion batteries Group weight loss 30%.
Carbon NanotubeFigure1: Carbon Nanotube

It is understood that carbon nanotubes are manufactured using carbon nanotechnology and graphene nanotechnology, and in addition to being able to significantly reduce weight, they can achieve faster storage and release of electrical energy than lithium-ion batteries. Ulrik Grape, CEO of NAWA Technologies, stated that our advantage is not only lightweight, but also that the faster charge/discharge rate is one of the advantages of this new technology. A power battery equipped with carbon nanotubes can recover power from kinetic energy recovery at a higher efficiency and quickly provide it to the motor.
GrapheneFigure2: Graphene

It is worth mentioning that although carbon nanotubes can provide very fast energy transmission, there is no large-capacity energy storage property. According to NAWA, the current technological route that can be considered is to integrate the battery pack with carbon nanotubes as a secondary battery into a lithium-ion power battery, and at the same time increase the charging rate, while also taking advantage of the high energy density of lithium-ion batteries. At the same time reduce the number of main battery charge and discharge, thereby extending its service life and improve endurance.

TOB NEW ENERGY which has 15 years experience in lithium battery industry. We supply full kinds of lithium battery making equipment and material, we have ability to build lithium battery production line for our clients. We have cooperated with many famous company, such as Apple, Sumsang, 3M, SKC etc.

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How to design to increase the battery capacity

Raising the battery’s energy density (capacity-type batteries only) is the top priority for designing batteries.

The capacity is not enough, the unit price is lower, the cycle is better, and the safety is even higher. The batteries that are made may be unattractive. So how can we increase the energy density of the battery? It can mainly be considered in several ways:

1.Increase the performance of materials that contribute to battery capacity: a. choose rich lithium material ; b. use more higher density material; c. use adhesive and conductive materials ; d. use materials with smaller thickness rebound ; e. choose a material system with better performance.

2.Reduce the volume of material that does not contribute to the battery capacity: This item is relatively complex, including: use of thinner aluminum plastic film, use of thinner battery separator, use of thinner tabs, use of thinner copper foil And aluminum foil, use thinner transparent adhesive tape and so on.

3.The use of more advanced battery production equipment: advanced equipment is mainly to improve the consistency of the production, reduce production fluctuations, and then to achieve the maximum value without changing the average value, and determine the quality of a batch of batteries, precisely It is the raised minimum here.

4.Improve the manufacturing conditions and conduct more stringent production monitoring.

5.Optimize the miscellaneous items that affect the cell’s capacity.

TOB NEW ENERGY which has 15 years experience in lithium battery industry. We supply full kinds of lithium battery making equipment and material, we have ability to build lithium battery production line for our clients. We have cooperated with many famous company, such as Apple, Sumsang, 3M, SKC etc.

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Charge for 10 minutes and running for 480 kilometers Lithium battery fast charge technology has a great breakthrough

A few days ago, some media reported that the 10-minute fast charging technology developed by the team of Wang Chaoyang of the Pennsylvania State University in the United States has overcome the key problems of rapid charging and battery life of lithium batteries.

It is reported that the U.S. Department of New Energy has announced plans to support the use of ultra-high-speed charging for electric vehicle batteries with US$19 million. Wang Chaoyang’s team’s technology won this plan and was officially adopted by the U.S. Department of New Energy. The goal is to reduce the cost of the battery to less than $100 per kilowatt-hour before 2028, increase the driving range to more than 480 kilometers, and reduce battery charging time to less than 15 minutes.

Fast charging of lithium ion batteryIt is understood that Wang Chaoyang team is on the basis of full-climate battery technology, to overcome the 10-minute fast charge technology, and has more than 1,000 cycles, equivalent to the life of 500,000 kilometers, this technology will become a 350 kilowatt-class fast charge Station’s battery products.

With the continuous development of battery technology, the “mileage anxiety” and “charging time anxiety” that are plaguing the development of new energy vehicles are being solved one by one.

TOB NEW ENERGY which has 15 years experience in lithium battery industry. We supply full kinds of lithium battery making equipment and material, we have ability to build lithium battery production line for our clients. We have cooperated with many famous company, such as Apple, Sumsang, 3M, SKC etc.

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Why lithium sulfur / lithium air battery does not have the power battery application prospects

It is generally accepted in the industry that the immediate term objective of lithium battery technology is to achieve 300wh / kg through a high-nickel NMC cathode and a silicon carbon anode. The medium-term (2025) target is based on a lithium-rich manganese-based / high capacity Si-C anode, to achieve 400wh / kg; forward is the development of lithium sulfur, lithium air battery, to achieve the specific energy than 500wh / kg.
Lithium air coin cell case
Figure 1:  Lithium air coin cell case
The long-term goal, lithium sulfur and lithium air battery theoretical value far exceeds 500wh / kg (lithium sulfur 2600wh / kg, lithium air 11000wh / kg), but its feasibility needs to be considered.
As a product, lithium air battery has four fatal flaws:
The first is the control of moisture. Lithium-ion battery is an open system, which is not the same as lithium-ion batteries, lithium-air use of oxygen in the air, while the air contains water, lithium will react with water. It is a difficult problem to solve both by oxygen permeation and waterproofing.
Second, catalytic reduction of oxygen. The reaction speed of oxygen is very slow. To improve the reactivity of oxygen, an efficient catalyst must be used. Nowadays the catalysts are all precious metals.
Third, is the lithium metal anode rechargeable.
Lithium Chips
Figure 2: Lithium Chips
Fourth, is the re-decomposition of the discharge product. Lithium-ion battery discharge product is lithium oxide, the solid lithium oxide re-catalyzed decomposition of oxygen and lithium, how difficult.
Look at the lithium-sulfur battery, the first is the electrode cycle performance is poor. On the one hand, dissolved lithium polysulfide diffuses to the negative electrode and then oxidizes at the positive electrode, resulting in a shuttle effect resulting in low coulombic efficiency and high self-discharge; on the other hand, dissolved lithium polysulfide also has a positive charge on the positive electrode surface during charging Deposition, resulting in the electrode surface due to blockage and inactivation, therefore, the electrode cycle performance is poor.
The second problem is the rechargeable of lithium metal anode, which is also a problem that is difficult to solve in a short time.
The third problem is the lithium-sulfur battery volume energy density is relatively low, may be only equal to lithium iron phosphate batteries. Because sulfur is an insulator , if you want to makes it conductive, allowing it to react and disperse it, a large amount of high surface area carbon must be used, resulting in a very small density of sulfur / carbon composites. In addition, the sulfur reaction is first dissolved and redeposited, so there must be a large number of liquid phase transmission channels on the electrode.
And now most of the lithium-sulfur battery, the sulfur electrode can not be pressed, the porosity is particularly high, so the volume energy density is very low.
TOB NEW ENERGY which has 15 years experience in lithium battery industry. We supply full kinds of lithium battery making equipment and material, we have ability to build lithium battery production line for our clients. We have cooperated with many famous company, such as Apple, Sumsang, 3M, SKC etc.

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Merry Christmas!

Christmas greetings – TOB new energy limited

In this special day, wishing you and your families peacefull Christmas and prosperous New Year. Thank you for all your continued support in 2017.

TOB new energy limited is specialized in lithium battery equipments and materials, we can supply a full set of lithium battery equipments and materials for research and testing. We provide you with a technology improvement program, we provide “one-stop” solution for you, provide a “Turn key” project for you.

Choose TOB, win-win future!

TOB NEW ENERGY LIMITED

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Warmly Congratulate XIAMEN TOB LIMITED on Winning The Outstanding Contribution Award of The Alibaba

Warmly congratulate XIAMEN TOB LIMITED on winning the outstanding contribution award of the Alibaba,

XIAMEN TOB LIMITED is an excellent company who has specialized in lithium ion battery producing machine and materials for more than 15 years.we can not only supply machine and material for lithium battery but also professional technical support.we have established more than 100 production line the different country,and our engineer will come to your factory to give you technical support.

We start business in Alibaba on 2012,so far,it has been 5 years pass,we have honour to winning the outsatnding contribution award of the Alibaba.we belived that give then you can get.

In the new year, we will march on.to be TOP OF BEST AND TOP OF BATTERY.and trust the harder it is, the more lucky it is.

Contact (Engineer & Sales): Miss Ailsa

 Email: tob.ailsa@tobmachine.com

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Whatsapp:+86 15980946821Alibaba award 1

Alibaba award