Secondary battery and electric device

By adjusting the ratio of nickel-cobalt ternary materials, the thickness-to-particle size ratio of the anode material layer, and the mass percentage of sulfate ester functional groups in the electrolyte, the structure of the secondary battery was optimized, the side reaction problem caused by lithium-nickel mixing was solved, and the fast-charging performance and cycle performance of the secondary battery were improved.

CN121862861BActive Publication Date: 2026-09-11ZHONGCHUANGXIN AVIATION TECH RES CENT (SHENZHEN) CO LTD
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Patent Information

Application Number
CN202610314692.X
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2026-03-13
Publication Date
2026-09-11
Estimated Expiration
2046-03-13

AI Technical Summary

Technical Problem

During charge-discharge cycles, the mixing of lithium and nickel in ternary lithium-ion batteries leads to increased side reactions between the cathode material and the electrolyte, which increases internal impedance and reduces cycle performance.

Method used

By adjusting the ratio of nickel-cobalt ternary materials, the thickness-to-particle size ratio of the anode material layer, and the mass percentage of sulfate functional groups in the electrolyte, cyclic sulfate compounds are introduced to optimize the structure of the positive and negative electrodes and the electrolyte composition, thereby reducing internal impedance and improving fast-charging and cycle performance.

Benefits of technology

By reducing the positive electrode interface impedance and suppressing the negative electrode side reaction, a balance is achieved between the fast charging performance and cycle performance of the secondary battery.

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Abstract

The application discloses a secondary battery and a power utilization device, and belongs to the technical field of secondary batteries. The secondary battery comprises a battery cell and an electrolyte, the battery cell comprises a positive electrode sheet and a negative electrode sheet, the positive electrode sheet comprises a positive electrode material layer, and the positive electrode material layer comprises a nickel-cobalt ternary material. By introducing a cyclic sulfate compound into the electrolyte and comprehensively regulating the phase ratio a of the nickel-cobalt ternary material, the ratio b between the thickness of the negative electrode material layer and the particle size Dv50 of the negative electrode material, and the mass percentage content c of the sulfate functional group in the electrolyte, so that a / (b x c) is within a suitable range, the internal impedance of the secondary battery can be reduced, the fast-charging performance of the secondary battery can be improved, the positive electrode sheet and the negative electrode sheet are not prone to side reactions with the electrolyte, and the cycle performance of the secondary battery is improved.
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