A silicon-based composite negative electrode material and its preparation method and application

The prelithiation and high-quality coating of silicon oxide materials by in-situ coating-co-lithium sintering method solve the problem of prelithiation in the prior art that the coating and coating layers are uneven, and efficient electrochemical performance improvement is achieved.

CN116387491BActive Publication Date: 2025-03-18SVOLT ENERGY TECHNOLOGY CO LTD
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Patent Information

Application Number
CN202310463702.2
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-04-26
Publication Date
2025-03-18
Estimated Expiration
2043-04-26

AI Technical Summary

Technical Problem

The prior art destroys the original carbon cladding layer on the silicon oxide surface during prelithiation, resulting in attenuation of the cyclic performance of the material. The traditional cladding method results in uneven cladding and weak bonding force, affecting the material performance.

Method used

In-situ cladding-co-lithium sintering method is used to prelithiate the silicon oxide material and achieve high-quality cladding on the surface of the silicon oxide material. The ion conductor cladding layer is used as the shell to enhance the binding force between the prelithiated silicon oxide particles and the cladding layer.

Benefits of technology

It effectively reduces the irreversible capacity of the silicon oxide negative electrode in the first cycle, improves the first Coulomb efficiency, improves the rate performance and cycle stability, and maintains the structural integrity of the cladding layer.

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Abstract

The present invention provides a silicon-based composite negative electrode material and a preparation method and application thereof, wherein the silicon-based composite negative electrode material comprises pre-lithiated silicon oxide particles and an ion conductor coating layer located on the surface of the pre-lithiated silicon oxide particles. In the present invention, there is a strong binding force between the pre-lithiated silicon oxide particles and the ion conductor coating layer, which effectively stabilizes the structure of the material and achieves high-quality coating of the inner core while achieving pre-lithiation. Pre-lithiation of silicon oxide particles not only reduces the irreversible capacity of the silicon oxide negative electrode in the first cycle, but also improves its first coulombic efficiency; the high-quality ion conductor coating layer not only promotes Li + The transmission of silicon iodine improves the rate performance of silicon iodine negative electrode materials, and also effectively inhibits the side reactions between active materials and electrolytes, thereby improving the cycle stability of silicon iodine negative electrode materials.
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