Cobalt tetraoxide, preparation method thereof, lithium cobalt oxide, positive electrode sheet and battery

By controlling the preparation process of cobalt carbonate and pre-sintering and calcining with flash dryers and rotary kilns, the grain size and specific surface area of ​​cobalt tetroxide are adjusted, and the problem of difficult control of cobalt tetroxide particle size, grain size and specific surface area in the prior art is solved, and the preparation of cobalt tetroxide with high sintering activity and mechanical strength is achieved, and the electrochemical performance of lithium cobalt oxide is improved.

CN119118214BActive Publication Date: 2025-03-28GUANGDONG BRUNP RECYCLING TECH CO LTD +1
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Patent Information

Application Number
CN202411587551.2
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-11-08
Publication Date
2025-03-28
Estimated Expiration
2044-11-08

AI Technical Summary

Technical Problem

The prior art is difficult to effectively control the particle size, grain size and specific surface area of ​​cobalt tetroxide while maintaining high sintering activity and mechanical strength, resulting in the impact of the electrochemical properties and morphology of lithium cobalt oxide.

Method used

By controlling the preparation process of cobalt carbonate, cobalt carbonate with a specific crystallinity and particle size is obtained, and pre-sintered by a flash dryer, and then calcined in a rotary kiln to adjust the grain size and specific surface area of ​​the (111) crystal surface of cobalt tetroxide to satisfy the range of 3.33g-1≤≤6.90g-1.

Benefits of technology

The preparation of cobalt tetroxide with high sintering activity and good mechanical properties is achieved, thereby improving the specific capacity of the obtained lithium cobalt oxide and the first charge and discharge efficiency.

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Abstract

The present invention discloses a cobalt oxide and a preparation method thereof, lithium cobalt oxide, a positive electrode sheet and a battery, and relates to the technical field of positive electrode materials for lithium batteries. The Dv50, the grain size D(111) of the (111) crystal plane and the specific surface area BET of the cobalt oxide satisfy the following relationship: 3.33 g ‑1 ≤#imgabs0#≤6.90g ‑1 , wherein the Dv50 of the cobalt oxide is 3-20 μm. The cobalt oxide is obtained by pre-sintering and calcining cobalt carbonate with a crystallinity of 30%-80% and a median particle size Dv50 of 3-22 μm; the cobalt oxide has high reactivity with the lithium source and good mechanical properties, and the obtained lithium cobalt oxide has a high lithium ion diffusion rate, thereby having a high specific capacity and initial charge and discharge efficiency.
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Citation Information

Patent Citations

  • Preparation method of large-particle-size and high-density spherical cobalt oxide

    CN105399148A

  • Preparation method and application of small-particle cobaltosic oxide

    CN118387935A

Cited By

  • Cobalt(ii,iii) oxide and preparation method therefor, lithium cobalt oxide, positive electrode sheet, and battery

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