Warm Isostatic Press for Solid-State Battery Manufacturing

Warm Isostatic Press for Solid-State Battery Manufacturing

SPECIFICATIONS

The TOB-WIP-7-20-600 warm isostatic press is a high temperature equipment that presses materials under high temperature and high pressure to improve material density and performance. Warm Isostatic Pressing (WIP) is a critical manufacturing step in the production of high-performance solid-state batteries. Its primary function is to address the fundamental challenge of poor solid-solid interfaces inherent in SSBs and to significantly enhance the density and contact integrity of the electrode and electrolyte components.

Technical principle:

This is a device that uses the principle that fluids transmit the same force in the same direction.

The pressure generated by the internal fluid applies uniform force to all surfaces, which is used in compression molding and lamination molding in material processing, and high-density densification of electrolyte layers.

The production process of solid-state batteries using isostatic pressing is as follows: material preparation, coating, cutting, slitting, stacking and bagging under dry room conditions. After the battery is watertightly sealed, it is densified by isostatic pressing, the pressure medium is dried, and then formed.

The introduction of isostatic pressing in the production of solid-state batteries can accurately control key parameters such as electrode density, thickness and porosity, and make the electrodes and electrolyte materials of solid-state batteries closely combined, optimize interface contact, reduce internal resistance, improve ionic conductivity and mechanical strength of solid-state batteries, etc., and also reduce the production process of solid-state batteries and reduce production costs.

Warm isostatic press（Warm Isostatic Pressing，WIP）It is an advanced molding equipment that combines high temperature and uniform pressure. Its working principle is to apply isotropic pressure (usually hundreds of MPa) in a closed cavity through an inert gas (such as argon) and perform hot pressing on the material under high temperature (such as 300-400℃). This technology was originally widely used in the fields of ceramics and cemented carbide. In recent years, it has been introduced into lithium battery manufacturing, especially in the packaging of sulfide solid electrolyte membrane (SE membrane).

Advantages：

1. The 600MPA warm isostatic pressing equipment can achieve a dimensional tolerance control of +-0.5%. Combined with the AI-driven pressure compensation algorithm, the compaction density deviation of the battery electrode can be controlled within the range of +-0.02g/cm3.

2. Improve battery performance

Enhanced density: WIP applies high temperature and high pressure to make the electrodes and electrolyte materials of solid-state batteries more tightly combined at the microscopic level. This increase in density helps to reduce the voids and defects inside the battery, thereby improving the ionic conductivity and mechanical strength of the battery.

Experimental verification shows that the WIP process increases the capacity utilization rate of nickel-rich ternary positive electrodes (NCM 70%) by 10%, clearing the way for the application of high-nickel systems in solid-state batteries.

3. Optimizing interface contact: In solid-state batteries, the interface contact between the electrolyte and the electrode is one of the key factors affecting battery performance. WIP can optimize the interface contact between the electrolyte and the electrode and reduce the interface impedance through high temperature and high pressure treatment, thereby improving the energy density and power density of the battery.

4. Simplify the production process

Reduce production steps: In the traditional solid-state battery production process, multiple steps are required to ensure good contact and sealing between battery components. WIP can significantly reduce production steps and improve production efficiency through one-step high temperature and high pressure treatment.

5. Reduce production costs: The use of WIP can reduce the need for additional sealing steps, thereby reducing material and labor costs in the production process. In addition, since WIP can produce higher performance batteries, it can reduce overall costs by increasing the energy density of the battery and extending its service life. The "wet slurry + in-situ sulfurization" process proposed in the literature combined with WIP packaging does not require complex vacuum coating equipment, which can reduce mass production costs by more than 60%, providing a feasible path for large-scale manufacturing of soft-pack batteries.

6. Improve production efficiency and yield rate

Automated production: WIP can be combined with an automated production line to achieve continuous production and efficient output of solid-state batteries. This automated production method can significantly improve production efficiency and reduce production errors caused by human factors.

Improved yield rate: Through WIP processing, good contact and sealing between battery components can be ensured, thereby reducing the risk of battery failure caused by poor contact or loose sealing. This helps to improve the yield rate of solid-state batteries and reduce production costs.

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