Cathode active materials, methods of manufacture and use

A cathode active material with a core of Li1+xTM1-xO2 and a Sr or Ba oxide coating addresses surface reactions in lithium-ion batteries, enhancing battery stability and reducing resistance growth.

WO2026114628A1PCT designated stage Publication Date: 2026-06-04BASF SE
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Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
BASF SE
Filing Date
2025-11-07
Publication Date
2026-06-04

AI Technical Summary

Technical Problem

Existing lithium-ion batteries face issues with undesired reactions on the surface of cathode active materials, leading to electrolyte decomposition and solvent degradation, which are not effectively addressed by current coatings that often involve volatile compounds and are difficult to handle.

Method used

A cathode active material composed of a core material with a specific formula Li1+xTM1-xO2, where TM is a combination of Ni and at least one of Mn, Co, and Al, with a monolithic and polycrystalline structure, coated with Sr or Ba oxide crystals, providing a protective layer that minimizes surface reactions while allowing lithium exchange.

Benefits of technology

The cathode active material reduces the tendency for side reactions with the electrolyte, resulting in low resistance growth upon cycling and improved battery performance.

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Abstract

Cathode active material comprising (A) a core material according to general formula: Li1+xTM1-xO2, wherein TM is a combination of Ni and at least one of Mn, Co and Al, and, optionally, at least one more metal selected from Mg, Zr, Ti, Nb, Ta, Y, Ce, and W, and x is in the range of from zero to 0.07, wherein the majority of the core material (A) is (A-1) a monolithic material composed of particles with an average particle diameter in the range of from 1.1 to 5 µm, determined by SEM image analysis, and wherein a minority of the core material (A) is (A-2) a polycrystalline material composed of primary particles with a size in the range of from 100 to 1000 nm, and (B) crystals of an oxide of Sr or Ba, located at the outer surface of the monoliths (A-1) and at the outer surface and in the voids of polycrystalline material (A-2).
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