A positive electrode sheet, a secondary battery, a battery module, a battery pack, and an electric device

By employing a core-shell structure and a coating layer design with specific element doping in the positive electrode active material of secondary batteries, the energy density and safety issues of secondary batteries have been solved, thereby improving the performance and lifespan of the batteries.

CN116998032BActive Publication Date: 2026-05-29CONTEMPORARY AMPEREX TECHNOLOGY CO LTD
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Patent Information

Application Number
CN202280017104.6
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2022-03-04
Publication Date
2026-05-29
Estimated Expiration
2042-03-04

AI Technical Summary

Technical Problem

Existing secondary batteries suffer from problems such as low energy density, low cell rate performance, poor dynamic performance, poor low-temperature performance, short cycle life, and low safety.

Method used

The first positive electrode active material has a core-shell structure, with the core being Li1+xMn1-yAyP1-zRzO4, the coating layer being pyrophosphate MP2O7 and phosphate XPO4, and the outer layer being carbon. Through specific element doping and two-layer coating, combined with the second positive electrode active material LiNiaCobMn(1-ab)O2, LiNiaCobAl(1-ab)O2 or LiCoO2, the conductivity and safety of the material are improved.

Benefits of technology

It improves the energy density, rate performance, kinetic performance, cycle performance and low temperature performance of secondary batteries, and enhances battery safety and extends cycle life.

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Abstract

The application provides a positive electrode sheet, a secondary battery, a battery module, a battery pack and a power utilization device. The positive electrode sheet comprises a positive electrode current collector and a positive electrode film layer with a single-layer or multi-layer structure arranged on at least one surface thereof; when the positive electrode film layer is a single-layer structure, at least one positive electrode film layer comprises a first positive electrode active material and a second positive electrode active material simultaneously; and / or when the positive electrode film layer is a multi-layer structure, the first positive electrode active material and the second positive electrode active material are simultaneously contained in at least one layer of at least one positive electrode film layer; the first positive electrode active material comprises a Li 1+x Mn 1‑y A y P 1‑z R z O4 core, a first coating layer comprising pyrophosphate MP2O7 and phosphate XPO4 which coats the core, and a second coating layer comprising a carbon element which coats the first coating layer. The secondary battery prepared from the positive electrode sheet has high energy density, high core rate performance, good kinetic performance and low-temperature performance, good cycle performance and high safety.
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