Positive electrode active material, positive electrode containing the same, and lithium secondary battery

A coated lithium composite transition metal oxide with Al and W enhances the stability and life characteristics of NCM-based lithium composite transition metal oxides in single-particle form by addressing particle cracking and electrolyte interactions.

JP2026520568APending Publication Date: 2026-06-23LG ENERGY SOLUTION LTD
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
LG ENERGY SOLUTION LTD
Filing Date
2024-06-28
Publication Date
2026-06-23

AI Technical Summary

Technical Problem

NCM-based lithium composite transition metal oxides in single-particle form exhibit inferior lithium mobility, high lithium diffusion resistance, and poor life characteristics under high voltage and high temperature conditions due to particle cracking and side reactions with the electrolyte.

Method used

A positive electrode active material is developed with a lithium composite transition metal oxide in single-particle or pseudo-single-particle form coated with aluminum (Al) and tungsten (W), and adjusted to specific nickel content and BET specific surface area conditions to enhance stability and reduce particle cracking.

Benefits of technology

The coating layer with Al and W improves high-voltage and high-temperature life characteristics by reducing particle cracking and side reactions, ensuring stable performance at 4.35V or higher.

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Abstract

The positive electrode active material according to the present invention comprises a lithium composite transition metal oxide in a pseudo-single particle form, which is a single particle consisting of one single nodule or a composite of 30 or fewer nodules, and a coating layer formed on the surface of the lithium composite transition metal oxide, wherein the coating layer contains aluminum (Al) and tungsten (W), and the positive electrode active material satisfies the following formula 1: [Formula 1] 45 ≤ X × X' ≤ 56, where X is the nickel content (in mol%) of the total metals other than lithium in the lithium composite transition metal oxide, and X' is the BET specific surface area (in m²) of the positive electrode active material. 2 It is / g).
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