Negative pole piece as well as preparation method and application thereof

Through the multi-layer active layer structure design and material selection, the lithium ion diffusion rate and transmission path are optimized, which solves the shortcomings of traditional negative electrode sheets in terms of energy density, fast charging capacity and cycle stability, and achieves high energy density, fast charging capacity and excellent cycle performance.

CN120565579AActive Publication Date: 2025-08-29JIANGSU ZENIO NEW ENERGY BATTERY TECH CO LTD
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Patent Information

Application Number
CN202510660463.9
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-05-21
Publication Date
2025-08-29
Estimated Expiration
2045-05-21

AI Technical Summary

Technical Problem

The single active layer structure of the traditional negative electrode sheet cannot take into account the battery energy density, fast charging capacity and cycle stability, and there are problems such as the contradiction between energy density and fast charging performance, limited cycle life and insufficient interface stability.

Method used

The multi-layer active layer structure design is adopted. The first active layer close to the current collector is carbon-coated secondary particle graphite, the intermediate layer is heteroatom-doped hard carbon, and the third active layer far from the current collector is porous carbon nanofiber. The lithium ion diffusion rate and transmission path are optimized through the synergy of the materials of each layer.

Benefits of technology

It realizes the high energy density, fast charging capability and excellent circulation performance of lithium-ion batteries, inhibits the growth of lithium dendrites, and improves the battery cycle stability and safety.

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Abstract

The invention relates to a negative pole piece and a preparation method and application thereof.The negative pole piece comprises a current collector and a negative active layer arranged on at least one face of the current collector in the thickness direction, the negative active layer comprises a first active layer, a second active layer and a third active layer, the first active layer is attached to the surface of the current collector, and the second active layer is attached to the surface of the current collector; the second active layer is arranged on the surface, far away from the current collector, of the first active layer, and the third active layer is arranged on the surface, far away from the first active layer, of the second active layer; the first active layer comprises carbon-coated secondary particle graphite, the second active layer comprises heteroatom-doped hard carbon, and the third active layer comprises porous carbon nanofibers. According to the lithium ion battery, the multiple active layers containing different active materials are arranged on the surface of the current collector, and meanwhile, the thickness of each active layer is regulated and the preparation process is optimized, so that the lithium ion battery containing the negative pole piece has high energy density, quick charge capacity and excellent cycle life.
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