Positive active material

By inducing selective growth of primary particles in lithium manganese oxide phases within lithium secondary batteries, the material addresses stability and performance issues, improving battery lifespan and reducing side reactions.

JP2026121316APending Publication Date: 2026-07-23ECOPRO BM CO LTD
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
ECOPRO BM CO LTD
Filing Date
2026-05-12
Publication Date
2026-07-23

AI Technical Summary

Technical Problem

Lithium-rich lithium manganese oxides used in lithium secondary batteries face issues with low electrochemical properties and stability due to excessive manganese and lithium, leading to rapid performance degradation and side reactions with the electrolyte during high-voltage operation.

Method used

A positive electrode active material comprising lithium manganese oxide with primary particles induced to grow in a selective direction, forming a solid solution or composite of phases belonging to the C2/m and R3-m space groups, and doped with halogens like fluorine during calcination to reduce specific surface area and mitigate lithium ion diffusibility.

Benefits of technology

This approach enhances the stability and lifespan of lithium secondary batteries by reducing side reactions and maintaining electrochemical performance, even under high voltage conditions, by controlling the growth of primary particles and their interaction with the electrolyte.

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Abstract

To provide a positive electrode active material that reduces the specific surface area of ​​lithium manganese oxide, thereby preventing a rapid decrease in battery performance due to side reactions during the initial battery reaction under high voltage conditions. [Solution] The present invention relates to a positive electrode active material comprising a lithium manganese oxide in which a phase belonging to the C2 / m space group and a phase belonging to the R3-m space group are solid-solved or composited, wherein the lithium manganese oxide includes secondary particles formed by the aggregation of a plurality of primary particles, at least a portion of the oxygen present in the lithium manganese oxide is replaced with halogen, and the average value of the short axis length of the primary particles, calculated from 20 primary particles selected in order of short axis length from the primary particles exposed on the surface of the secondary particles from an SEM image of the secondary particles, is 110 nm or more and less than 400 nm.
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