Lithium-rich manganese-based positive electrode material, positive electrode foil, secondary battery, battery module and electrical device

By coating lithium-rich manganese-based positive electrodes with graphene of varying sheet sizes, the material's conductivity and high-temperature stability are enhanced, addressing the limitations of existing lithium-rich manganese-based materials and improving lithium-ion battery performance.

WO2026112961A1PCT designated stage Publication Date: 2026-06-04HUNAN SHANSHAN ENERGY TECH CO LTD +1
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Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
HUNAN SHANSHAN ENERGY TECH CO LTD
Filing Date
2024-11-29
Publication Date
2026-06-04

AI Technical Summary

Technical Problem

Lithium-rich manganese-based positive electrode materials face issues with low conductivity and instability under high-temperature conditions, limiting their application in lithium-ion batteries, despite their potential advantages of high operating voltage and specific capacity.

Method used

A lithium-rich manganese-based positive electrode material is coated with graphene of varying sheet sizes, forming a 3D electrically conductive network that enhances electrical conductivity and stabilizes the material at high temperatures, achieved through a method involving sintering and dispersion of graphene with specific sheet size ratios and controlled coating amounts.

Benefits of technology

The graphene-coated lithium-rich manganese-based positive electrode material exhibits improved electrical conductivity and high-temperature storage performance, reducing polarization resistance and enhancing ion and electron transport kinetics.

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Abstract

A lithium-rich manganese-based positive electrode material includes cores and coating layers coated on surfaces of the cores. The cores include a lithium-rich manganese base material, and the coating layers include graphene. The graphene includes a first graphene material with a first sheet size and a second graphene material with a second sheet size. A ratio α of the first sheet size to a particle size of the cores is in a range from 0.1 to 0.9, and a ratio β of the second sheet size to the particle size of the cores is in a range from 1 to 5.
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