Low-chlorine battery grade cobaltosic oxide as well as preparation method and application thereof

By mixing with transition metal oxides for sintering and backwashing process, the problem of residual chloride ions in cobalt carbonate was solved, the electrochemical properties of cobalt tetroxide and lithium cobaltate were improved, and the service life of the battery was extended.

CN120589798APending Publication Date: 2025-09-05GUANGDONG BRUNP RECYCLING TECH CO LTD +3
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Patent Information

Application Number
CN202510770842.3
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-06-10
Publication Date
2025-09-05

AI Technical Summary

Technical Problem

In the prior art, during the preparation of cobalt tetroxide from highly crystalline cobalt carbonate, chloride ions are difficult to remove, resulting in their residue in lithium cobalt oxide, affecting the electrochemical properties of the material and battery life.

Method used

Cobalt carbonate is generated through a parallel mixing reaction and mixed with transition metal oxides such as magnesium oxide, zinc oxide or manganese oxide for sintering to generate soluble chloride, which is subsequently removed by backwashing to form a surface coating and doping modification to reduce the chlorine content in cobalt trioxide.

Benefits of technology

Effectively reduce the chlorine content in cobalt tetroxide, improve the electrochemical performance and cycle stability of lithium cobalt oxide, reduce the interface instability between electrode materials and electrolytes, and extend battery life.

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Abstract

The invention belongs to the technical field of battery materials, and provides low-chlorine battery grade cobaltosic oxide and a preparation method and application thereof.The preparation method comprises the steps that cobalt carbonate is generated through a parallel flow mixing reaction, then cobalt carbonate and transition metal oxide are mixed and sintered, and cobaltosic oxide containing transition metal chloride is obtained; and carrying out backwashing and tempering on the cobaltosic oxide to obtain the low-chlorine battery grade cobaltosic oxide. Transition metal oxide is added to generate cobaltosic oxide in situ, meanwhile, transition metal reacts with the chlorine element in cobalt carbonate, and a reaction product can be removed through subsequent backwashing, so that the chlorine element content of cobaltosic oxide is effectively reduced; and meanwhile, the transition metal oxide can form coating and surface doping modification on the cobaltosic oxide in situ, so that the electrochemical performance of the lithium cobalt oxide synthesized by using the obtained cobaltosic oxide is further improved.
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Citation Information

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