Cathode active material having a core-shell structure and method for producing the same

A cathode active material with a core-shell structure, featuring a nickel-rich core and a cobalt oxide shell, addresses issues of specific capacity, cycling performance, and conductivity in lithium-ion batteries, enhancing battery performance.

JP2026507257APending Publication Date: 2026-02-27BASF SE
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Patent Information

Application Number
JP2025551571
Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
Priority Date
2023-03-03
Filing Date
2024-02-26
Publication Date
2026-02-27

AI Technical Summary

Technical Problem

Existing cathode active materials in lithium-ion batteries, particularly Ni-rich materials, face challenges with specific capacity, cycling performance, resistance growth, and capacity loss due to corrosion, as well as inadequate electrical conductivity.

Method used

A cathode active material with a core-shell structure is developed, comprising a nickel-rich core (Li1+x TM1-x O2) and a shell containing cobalt compounds in the +III oxidation state and an oxide of B or W, where TM includes Ni, Mn, Co, and Al, with a glassy or amorphous shell covering the surface of secondary particles.

Benefits of technology

The cathode active material exhibits improved specific capacity, reduced resistance growth, enhanced cycling performance, and improved electrical conductivity, while minimizing capacity loss and corrosion.

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Abstract

(A) General formula Li 1+x TM 1-x a core material based on O2, wherein TM is a combination of Ni and at least two of Mn, Co and Al, and optionally at least one further metal selected from Mg, Ti, Zr, Nb, Ta and W, where x is in the range of -0.05 to +0.05, and the nickel content is in the range of 80 to 99 mol% of TM; (B) particles of cobalt compound(s) in which at least some of the cobalt is in the +III oxidation state; (C) a shell containing at least one oxide of B or W 1. A cathode active material comprising: The core material (A) is a polycrystalline material in which secondary particles are composed of primary particles, and particles (B) of a cobalt compound are concentrated on the surfaces of the secondary particles.
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