Method for producing positive electrode active material and positive electrode active material

CN123036260APending Publication Date: 2026-11-03ECOPRO BM CO LTD
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Patent Information

Application Number
CN202580024167.8
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Priority Date
2024-10-31
Filing Date
2025-06-20
Publication Date
2026-11-03

AI Technical Summary

Technical Problem

Existing lithium-ion batteries have excessive residual lithium content in their positive electrode active materials, which affects the battery's lifespan and performance.

Method used

A positive electrode active material containing a lithium boron oxide coating is formed by preparing a transition metal hydroxide containing nickel, cobalt, and manganese, heating it in an oxygen atmosphere to form a preliminary lithium transition metal oxide, and then mixing it with a boron precursor and heating it to form a lithium transition metal oxide. The content of the boron precursor is controlled in the range of 0.7 mol% to 1.3 mol%.

Benefits of technology

It effectively reduces the amount of residual lithium in the positive electrode active material, improves the life characteristics and performance of lithium secondary batteries, and enhances the capacity and electrochemical characteristics of the battery.

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Abstract

The present disclosure relates to a method for manufacturing a positive electrode active material, comprising: obtaining a transition metal hydroxide containing nickel, cobalt and manganese; heating a first mixture in an oxygen atmosphere and at a first temperature to obtain a preliminary lithium transition metal oxide; and heating a second mixture in an oxygen atmosphere and at a second temperature to obtain a lithium transition metal oxide; wherein the first mixture contains the transition metal hydroxide and a lithium compound, the second mixture contains the preliminary lithium transition metal oxide and a boron precursor, the second temperature is in the range of 730 to 780 °C, and the boron precursor content of the second mixture is in the range of 0.7 to 1.3 mol% based on the transition metal other than lithium in the preliminary lithium transition metal oxide.
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