Negative electrode sheet and preparation method thereof, lithium-ion battery and power-consuming device

By introducing metal salts into the negative electrode of lithium-ion batteries, the problem of lithium plating is solved, the cycle performance and coulombic efficiency of lithium-ion batteries are improved, and the growth of lithium dendrites is inhibited.

CN119230715BActive Publication Date: 2025-10-14CONTEMPORARY AMPEREX TECHNOLOGY CO LTD
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Patent Information

Application Number
CN202310796582.8
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-06-30
Publication Date
2025-10-14
Estimated Expiration
2043-06-30

AI Technical Summary

Technical Problem

During the cycling process of lithium-ion batteries, process and environmental factors may cause lithium deposition on the negative electrode, leading to the growth of lithium dendrites, threatening the reversible capacity and cycle life.

Method used

Metal salts are introduced into the negative electrode. The reduction potential of the metal salts is higher than that of lithium ions, and the difference in reduction potential with lithium ions is less than or equal to 0.8V. The metal salts dissolve in the electrolyte to form free metal ions, uniform current density, and inhibit lithium precipitation.

Benefits of technology

Effectively inhibit lithium plating, reduce side reactions, improve the cycle performance and coulombic efficiency of lithium-ion batteries, and reduce the impact on energy density.

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Abstract

The embodiment of the application discloses a negative pole piece, a preparation method thereof, a lithium ion battery and an electric device. The negative pole piece comprises a current collector and a negative active material layer arranged on at least one side of the current collector. The negative active material layer comprises a metal salt, the metal salt comprises metal ions, the reduction potential of the metal ions is greater than the reduction potential of lithium ions, and the difference between the reduction potential of the metal ions and the reduction potential of lithium ions is less than or equal to 0.8 V. The application of the negative pole piece to the lithium ion battery can effectively inhibit lithium precipitation and help improve the cycle performance and coulomb efficiency of the lithium ion battery.
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