Secondary batteries and electrical appliances

By using lithium-containing transition metal oxides and lithium transition metal phosphates as positive electrode active materials in lithium-ion secondary batteries, and through modification and porosity optimization, the problem of low power density in lithium-ion secondary batteries was solved, achieving high power density and good high-temperature cycling performance.

CN119852484BActive Publication Date: 2026-06-30CONTEMPORARY AMPEREX TECHNOLOGY CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CONTEMPORARY AMPEREX TECHNOLOGY CO LTD
Filing Date
2024-10-29
Publication Date
2026-06-30

AI Technical Summary

Technical Problem

Existing lithium-ion secondary batteries have low power density when using lithium-containing transition metal oxides as positive electrode active materials.

Method used

Lithium-containing transition metal oxides and lithium-containing transition metal phosphates are used as positive electrode active materials. The zirconium content in the core region corresponding to 1/2 radius of the primary particle center of the lithium transition metal oxide is 40%-60%. Through doping and/or coating modification, the electrode porosity measured by the true density method is 23%-27%, which improves the wettability of the electrolyte and the ion conduction path.

Benefits of technology

It improves the power density and high-temperature cycle performance of lithium-ion secondary batteries, enhances kinetic performance, and slows down the voltage drop rate at low SOC.

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Abstract

This application provides a lithium-ion secondary battery and an electrical device. Specifically, this application provides a lithium-ion secondary battery, characterized in that the lithium-ion secondary battery includes a positive electrode sheet, the positive electrode sheet includes a positive current collector and a positive electrode film layer disposed on the positive current collector and including a positive electrode active material, wherein the positive electrode active material includes a lithium-containing transition metal oxide and a lithium-containing transition metal phosphate, the lithium-containing transition metal oxide includes nickel, cobalt, manganese and / or aluminum, and zirconium, the zirconium content in the core region corresponding to 1 / 2 radius of the primary particle center of the lithium-containing transition metal oxide is 40%-60%, the lithium-containing transition metal phosphate includes iron, and the lithium-containing transition metal phosphate includes secondary particles formed by the agglomeration of primary particles.
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