Lithium-ion rechargeable battery

JP2026090559APending Publication Date: 2026-06-02SEMICON ENERGY LAB CO LTD
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
SEMICON ENERGY LAB CO LTD
Filing Date
2026-03-02
Publication Date
2026-06-02

AI Technical Summary

Technical Problem

Lithium-ion secondary batteries face challenges in maintaining capacity during charge-discharge cycles, cycle characteristics, safety, reliability, and cost, with existing cathode active materials requiring improvement.

Method used

A positive electrode active material with distinct inner and outer regions, where the inner region is a non-stoichiometric compound and the outer region is a stoichiometric compound, coated with graphene oxide to prevent shape changes and enhance stability, is developed. The material is produced through a sol-gel process and heat treatment, with specific elemental ratios and crystal structure alignments.

Benefits of technology

The solution suppresses capacity degradation, enhances charge-discharge characteristics, and improves safety and reliability of lithium-ion secondary batteries, while maintaining high capacity and stability during cycling.

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Abstract

To provide a positive electrode active material that can improve the cycle characteristics of secondary batteries. [Solution] Surface layer of a positive electrode active material such as lithium cobalt oxide having a layered rock salt type crystal structure Two types of regions are provided in the part. The inner region is a non-stoichiometric compound containing a transition metal such as titanium, and the outer region is a non-stoichiometric compound containing a transition metal such as titanium. The outer region consists of compounds of typical elements such as magnesium oxide. Both regions are of the rock salt type. It has the following crystalline structure. Furthermore, the internal layered rock salt type crystalline structure and the two types of regions on the surface are topographic It is xy. Because these are topotaxis, the crystal structure of the positive electrode active material produced by charging and discharging It can effectively suppress changes in structure. Furthermore, the outer coating layer that comes into contact with the electrolyte is chemically stable. Because it is a compound of typical elements, it can be used to create a secondary battery with excellent cycle characteristics.
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