Negative electrode and method for manufacturing the same, and electric device

By designing a conductive enhancement layer and a gradient electrolyte layer in the thinned region of the negative electrode, the problems of insufficient ion flux and lithium plating in the thinned region of lithium batteries are solved, thereby improving the fast charging performance of the battery and reducing the cost.

CN121905792BActive Publication Date: 2026-06-02SUZHOU QINGTAO NEW ENERGY TECH CO LTD
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Patent Information

Application Number
CN202610355482.5
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2026-03-23
Publication Date
2026-06-02
Estimated Expiration
2046-03-23

AI Technical Summary

Technical Problem

Existing technologies cannot effectively solve the problems of insufficient ion flux and lithium plating in the thinned region of lithium batteries, which leads to performance degradation of the battery under fast charging conditions. Furthermore, the use of high-concentration lithium salts increases material costs and triggers interfacial side reactions.

Method used

A composite structure layer, including a conductive enhancement layer and a gradient electrolyte layer, is covered in the thinned region of the negative electrode active material layer. The conductive enhancement layer is composed of conductive materials and nano-quantum dots, and the lithium salt concentration in the gradient electrolyte layer increases progressively to optimize charge transport dynamics and ensure that the ion flux matches the electron flux.

Benefits of technology

It effectively suppresses lithium plating, improves the battery's fast-charging capacity retention rate, and avoids the use of expensive materials, thus reducing costs.

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Abstract

The embodiment of the application discloses a negative electrode and a preparation method thereof and an electric device. The negative electrode comprises a current collector and an active material layer arranged on at least one side of the current collector. The active material layer comprises a main body area and a thinned area at an end. The negative electrode further comprises a composite structure layer covering and adhering to the surface of the thinned area. The composite structure layer comprises a conductive enhancement layer and a gradient electrolyte layer which are sequentially combined along the thickness direction of the active material layer and gradually away from the current collector. The gradient electrolyte layer comprises lithium salt. The concentration of the lithium salt in the gradient electrolyte layer linearly increases away from the conductive enhancement layer. The conductive enhancement layer and the gradient electrolyte layer along the thickness direction of the active material layer and gradually away from the current collector are covered and adhered to the thinned area. The charge transport kinetics of the region is optimized, a continuous ion driving force is formed during large-current charging, the ion flux and the electron flux are matched, lithium precipitation is effectively inhibited, the fast-charging capacity retention rate of the battery is improved, and the cost is reduced.
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