Lithium ion secondary battery, battery device, and power device

By setting carbon coating material on the surface of the positive electrode active material and controlling the degree of graphitization and concentration, the problem of balancing energy density and kinetic performance in lithium-ion secondary batteries was solved, achieving a balance between high density and good kinetic performance.

CN121964778APending Publication Date: 2026-05-01CONTEMPORARY AMPEREX TECHNOLOGY CO LTD
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Patent Information

Application Number
CN202610208792.4
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Priority Date
2025-03-28
Filing Date
2025-04-23
Publication Date
2026-05-01

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, which are difficult to balance between high energy density and kinetic requirements.

Method used

By setting carbon coating material on the surface of the positive electrode active material, the graphitization degree and graphitization concentration of the positive electrode film are controlled, so that the median graphitization degree C50 is between 0.95 and 1.20, and the concentration (C90-C10)/C50 is between 0.01 and 0.04. Combined with appropriate particle size distribution and sintering process, uniform particle slip and high compaction density are achieved.

Benefits of technology

This improves the compaction density of the positive electrode and the energy density of the lithium-ion secondary battery, while maintaining good kinetic performance and reducing the problems of local stress concentration and inconsistent lithium intercalation rate caused by uneven graphitization.

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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 a graphitization degree C value cumulative distribution curve 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, and the concentration ratio (C90-C10) / C50 of the C value is 0.01-0.04; wherein the graphitization degree C value is IG / ID, IG represents the G peak intensity of the Raman spectrum at the position of 1580 + / -100 cm <-1 >, and ID represents the D peak intensity of the Raman spectrum at the position of 1350 + / -100 cm <-1 >.
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