All-solid-state battery including a positive electrode with a larger area than a negative electrode and its manufacturing method

By designing all-solid-state batteries with a thicker positive electrode and controlled pressure application, the battery addresses interfacial resistance and short circuit issues, ensuring safety and performance in high-capacity batteries.

JP7768630B2Active Publication Date: 2025-11-12LG ENERGY SOLUTION LTD
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Patent Information

Application Number
JP2023526650
Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
Priority Date
2020-11-04
Filing Date
2021-11-02
Publication Date
2025-11-12
Estimated Expiration
2041-11-02

AI Technical Summary

Technical Problem

All-solid-state batteries face issues with high interfacial resistance and potential short circuits due to limited contact areas between electrodes and solid electrolyte layers, especially when thick electrodes are used, leading to safety concerns such as fire or explosion.

Method used

The battery design includes a positive electrode thicker than the negative electrode, with the area facing the pressure part smaller than the area not facing it, and applying pressure from the side of the smaller area to the larger area to uniformly pressurize the assembly, using a stronger positive electrode material and a thinner solid electrolyte layer.

Benefits of technology

This configuration reduces short circuits and twisting, enhances safety, and improves performance by maintaining electrode integrity and reducing interfacial resistance, allowing for high-capacity and high-density all-solid-state batteries.

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Abstract

The present invention relates to an all-solid-state battery including an electrode assembly including a positive electrode, a negative electrode, and a solid electrolyte layer disposed between the positive electrode and the negative electrode, and a battery case that houses the electrode assembly, wherein the positive electrode is thicker than the negative electrode, and when the electrode assembly is pressed, the area of ​​the electrode that directly faces a pressing part is smaller than the area of ​​the electrode that does not directly face the pressing part, and a method for manufacturing the same.
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Citation Information

Patent Citations

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    JP1984029748A

  • Method for manufacturing all solid state battery

    JP2014127463A

  • Method for manufacturing all-solid battery, and all-solid battery

    JP2019160516A

  • All-solid battery and method of manufacturing the same

    US20190157648A1