Preparation method of low-expansion silicon-based anode sheet, low-expansion silicon-based anode sheet and solid-state battery

By preparing low-expansion silicon-based anode sheets with cross-linked three-dimensional structures through electrospinning and cross-linking treatment, the volume expansion problem of silicon-based anode materials in solid-state batteries is solved, improving the cycle performance and safety of the batteries. This method is suitable for all-solid-state lithium batteries in new energy vehicles.

CN116544361BActive Publication Date: 2026-05-26CHINA FAW CO LTD +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CHINA FAW CO LTD
Filing Date
2023-06-20
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

Existing silicon-based anode materials suffer from severe volume expansion in solid-state batteries, leading to electrode structure damage and affecting battery cycle life and safety.

Method used

Low-expansion silicon-based anode sheets with cross-linked three-dimensional structures are prepared by electrospinning technology and ultraviolet or thermal initiation processes. Polymers, lithium salts, conductive agents and nano-silicon materials are prepared into nanofibers by electrospinning process, and combined with cross-linking treatment to form a three-dimensional network structure with good ion conduction and electron conduction properties, with reserved pores to accommodate silicon expansion.

Benefits of technology

It effectively reduces the expansion of the negative electrode, improves the cycle performance and capacity retention of the battery, extends the cycle life of the solid-state battery, and enhances the battery's safety and energy density.

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Abstract

This invention provides a method for preparing a low-expansion silicon-based anode sheet, a low-expansion silicon-based anode sheet, and a solid-state battery, to solve the problem of large volume expansion of anode sheets. The preparation method includes: weighing a polymer, dissolving the polymer completely in a solvent, adding a lithium salt to the solvent and dissolving it completely, and stirring for a first preset time; adding nano-silicon material and a conductive agent, stirring thoroughly to obtain a spinning solution, adding an initiator and stirring for a second preset time; loading the spinning solution into an electrospinning device, applying an electrospinning process, and preparing the spinning solution into nanofibers under preset voltage and distance conditions, and receiving them with copper foil to obtain a first silicon-based anode with a three-dimensional network structure; applying ultraviolet and / or thermal initiation processes to the first silicon-based anode to prepare a second silicon-based anode with a cross-linked three-dimensional structure; and rolling the prepared second silicon-based anode to a preset porosity to obtain a low-expansion silicon-based anode sheet.
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