Positive pole piece, battery and electric equipment

The positive electrode sheet structure with polyanion and layered ternary materials synergistically addresses manganese dissolution issues, enhancing battery performance by maintaining energy density and cycle life through targeted manganese adsorption.

CN119252855AActive Publication Date: 2025-01-03CONTEMPORARY AMPEREX TECHNOLOGY CO LTD
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Patent Information

Application Number
CN202310807049.7
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2023-07-03
Publication Date
2025-01-03
Estimated Expiration
2043-07-03

AI Technical Summary

Technical Problem

Lithium-ion secondary batteries face challenges in balancing cycle performance and energy density, with polyanion cathode materials containing Mn elements improving cycle performance but reducing energy density, while layered ternary materials enhance energy density but compromise cycle performance, and manganese dissolution affects battery life by blocking separators or damaging the negative electrode SEI film.

Method used

A positive electrode sheet structure is designed with a polyanion positive electrode material containing Mn elements close to the current collector, sandwiched by a layered ternary material and a manganese ion adsorbent in the second layer, limiting manganese diffusion and utilizing the layered ternary material as a carrier for the adsorbent without adding an extra layer, thereby adsorbing dissolved manganese.

Benefits of technology

This structure enhances battery performance by maintaining energy density and improving cycle life by effectively adsorbing dissolved manganese, reducing the risk of thermal runaway and negative electrode damage.

✦ Generated by Eureka AI based on patent content.

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Abstract

The invention relates to a positive pole piece, a battery and electric equipment. The positive pole piece comprises a positive current collector, a first positive active material layer and a second positive active material layer; the second positive active material layer is positioned on one side, deviating from the current collector, of the first positive active material layer; the first positive electrode active material comprises a polyanion positive electrode material containing an Mn element; the second positive electrode active material layer comprises a second positive electrode active material and a manganese ion adsorbent; the second positive electrode active material includes a layered ternary material. According to the present invention, the Mn element-containing polyanion positive electrode material is sandwiched between the current collector and the layered ternary material, and the manganese ion adsorbent is arranged in the second positive electrode active material layer, such that the Mn in the Mn element-containing polyanion positive electrode material must penetrate through the second positive electrode active material layer when the Mn is dissolved out and is diffused outward so as to restrict the diffusion of the Mn to the negative electrode.
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Citation Information

Patent Citations

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