Method for manufacturing a positive electrode active material for lithium secondary batteries and a lithium secondary battery containing a positive electrode active material manufactured using the same.

A three-stage calcination process with a higher second-stage temperature and lower third-stage temperature stabilizes the crystal structure of high-nickel NCM cathode materials, enhancing electrochemical performance and lifespan in lithium-ion batteries.

JP2026518964APending Publication Date: 2026-06-11POSCO FUTURE M CO LTD
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
POSCO FUTURE M CO LTD
Filing Date
2024-06-26
Publication Date
2026-06-11

AI Technical Summary

⚠Technical Problem

High-nickel NCM cathode materials used in lithium-ion batteries for electric vehicles face issues such as reduced particle strength, increased reaction with electrolyte, gas generation, and structural instability due to high nickel content, leading to unstable electrochemical properties and reduced lifespan.

⚗Method used

A three-stage calcination process is employed to produce a single-particle form of the positive electrode active material, with the second stage at a higher temperature and the third stage at a lower temperature than the first, followed by a coating process to stabilize the crystal structure and improve particle strength.

🎯Benefits of technology

The method results in a positive electrode active material with improved electrochemical properties, enhanced lifespan, and reduced gas generation, achieving higher energy density and safety.

✦ Generated by Eureka AI based on patent content.

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Abstract

This embodiment relates to a method for producing a positive electrode active material for a lithium secondary battery and a lithium secondary battery containing the same. A method for producing a positive electrode active material for a lithium secondary battery according to one embodiment includes the steps of: preparing a metal hydroxide containing nickel, cobalt, and manganese; mixing the metal hydroxide, lithium raw material, and dope raw material to produce a mixture; pre-calcining the mixture to obtain a pre-calcined product; calcining the pre-calcined product in a three-stage process: a first-stage calcination, a second-stage calcination, and a third-stage calcination to obtain a calcined product in single-particle form; and mixing the calcined product and a coating raw material, followed by heat treatment to obtain a metal oxide with a coating layer formed thereon, wherein the second-stage calcination may be performed at a higher temperature than the first-stage calcination, and the third-stage calcination may be performed at a lower temperature than the first-stage calcination.
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