Lithium ion secondary battery, battery device, and power device

By controlling the proportion of large particles and the degree of graphitization in the positive electrode film, the problem of balancing energy density and kinetic performance in lithium-ion secondary batteries was solved, and a battery design with high density and good kinetic performance was achieved.

CN121035306APending Publication Date: 2025-11-28CONTEMPORARY AMPEREX TECHNOLOGY CO LTD
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Patent Information

Application Number
CN202511140599.3
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Priority Date
2025-03-28
Filing Date
2025-04-30
Publication Date
2025-11-28

AI Technical Summary

Technical Problem

Existing technologies struggle to simultaneously improve the energy density and kinetic performance of lithium-ion secondary batteries, especially lithium-containing transition metal phosphate materials, where increasing energy density leads to a decrease in kinetic performance.

Method used

By controlling the area ratio of particles with a diameter greater than or equal to 1.5 μm in the positive electrode film layer to be between 8.0% and 20.0%, and combining the graphitization degree C50 to be between 0.95 and 1.20, the graphitization degree of the positive electrode active material and the crystallinity of the carbon layer on the particle surface are improved, promoting particle slip and achieving a balance between high compaction density and good kinetic performance.

Benefits of technology

While maintaining the battery's dynamic performance, the compaction density and energy density of the electrode were improved, thus enhancing the overall performance of the lithium-ion secondary battery.

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Abstract

The invention provides a lithium ion secondary battery, a battery device and an electric device. The lithium ion secondary battery comprises a positive pole piece, a negative pole piece and an electrolyte, the positive pole piece comprises a positive current collector and a positive film layer arranged on at least one side of the positive current collector, the positive film layer comprises a positive active material, and the positive active material comprises lithium-containing transition metal phosphate particles of which at least partial surfaces are provided with carbon coating materials; in the tangent plane of the positive electrode film layer along the thickness direction of the pole piece, the area ratio of particles with the particle size of more than or equal to 1.5 microns is more than or equal to 8.0% and less than or equal to 20.0%; in a cumulative distribution curve of a graphitization degree C value obtained by the positive electrode film layer in a surface scanning mode of a laser microscopic confocal Raman spectrometer, the median C50 of the graphitization degree is greater than or equal to 0.95 and less than or equal to 1.20.
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