Lithium ion battery positive electrode material and preparation method and application thereof

By using hydrogen sulfide atmosphere to perform high-temperature treatment and lithium powder coating in the process of preparing the positive electrode material of lithium ion battery, the problem of electrochemical performance reduction in the residue of sulfate in NCAOH is solved, and the capacity and circulation performance of the positive electrode material are improved.

CN119695050AActive Publication Date: 2025-03-25GEM WUXI ENERGY MATERIAL CO LTD
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Patent Information

Application Number
CN202411891080.4
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-20
Publication Date
2025-03-25
Estimated Expiration
2044-12-20

AI Technical Summary

Technical Problem

The high residual amount of sulfate in existing NCAOH results in a decrease in the electrochemical properties of the cathode material.

Method used

After mixing the ternary precursor containing sulfate with a lithium source, performing the first sintering treatment, performing the second sintering treatment in a hydrogen sulfide atmosphere, mixing it with lithium powder and performing the third sintering treatment in an inert atmosphere, a lithium battery positive electrode material is prepared.

Benefits of technology

It effectively reduces the sulfate content in the positive electrode material, improves the capacity and circulation performance of the material, and avoids the dissolution and structural stability of metal during alkali washing.

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Abstract

The invention relates to the technical field of positive electrode materials, in particular to a lithium ion battery positive electrode material and a preparation method and application thereof. The preparation method of the lithium ion battery positive electrode material comprises the following steps: uniformly mixing a ternary precursor containing sulfate radicals and a lithium source to obtain a premix; placing the premix in an oxygen-containing atmosphere, and carrying out first sintering treatment to obtain a first sintered material; placing the primary sintered material in a hydrogen sulfide atmosphere, and carrying out secondary sintering treatment at the temperature of 300-400 DEG C to obtain a secondary sintered material; and uniformly mixing the secondary sintering material with lithium powder, and carrying out third sintering treatment in an inert atmosphere to prepare the lithium ion battery positive electrode material. According to the invention, the phenomenon that elemental sulfur is generated when a ternary precursor containing sulfate radicals is subjected to high-temperature treatment in a hydrogen sulfide atmosphere is utilized, the treated product is subjected to lithium matching sintering to synthesize lithium sulfide to coat the surface of the material, and the inactive sulfate radicals are converted into lithium sulfide capable of reversibly intercalating and deintercalating lithium ions; therefore, the capacity and other electrochemical performances of the positive electrode material are improved.
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Citation Information

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