Chemical pre-lithiation reagent for sulfide solid-state battery as well as preparation method and application of chemical pre-lithiation reagent
By prelithiating the silicon-based negative electrode sheet with specific chemical prelithiation reagents, the problem of low energy density and cycle stability in the application of silicon-based materials in sulfide all-solid state batteries is solved, and higher battery performance is achieved.
CN119905691APending Publication Date: 2025-04-29ENPOWER (PEKING) INC
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Patent Information
- Application Number
- CN202510109946.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-23
- Publication Date
- 2025-04-29
AI Technical Summary
Technical Problem
The application of silicon-based materials in sulfide all-solid state batteries has problems of large initial irreversible capacity and low cycle stability, resulting in limited battery energy density and service life.
Method used
Specific chemical prelithiation reagents, including aromatic compounds, lithium sources, solvent A and solvent B, are used to soak or wet the silicon-based negative electrode sheet to regulate the prelithiation amount, and accurately achieve prelithiation of the silicon-based negative electrode.
Benefits of technology
The first Coulomb efficiency and energy density of sulfide all-solid state batteries have been improved, the volume expansion of silicon-based materials has been alleviated, and the cycle life of the battery has been extended.
✦ Generated by Eureka AI based on patent content.
Abstract
The invention provides a chemical pre-lithiation reagent for a sulfide solid-state battery as well as a preparation method and application of the chemical pre-lithiation reagent. The chemical pre-lithiation reagent comprises an aromatic compound, a lithium source, a solvent A and a solvent B, wherein the concentration of the aromatic compound in the chemical pre-lithiation reagent is 0.0009 mol / L-8. 5mol / L, the mass ratio of the lithium source to the aromatic compound is (1-10): (10-1), and the mass ratio of the solvent B to the solvent A is (1-10): (5-1); the polarity of the solvent A is 3-7; the polarity of the solvent B is less than 3. According to the pre-lithiation method, the purpose of regulating and controlling the pre-lithiation amount is achieved by preparing the specific pre-lithiation reagent and then soaking or wetting the silicon-based negative electrode piece, the purpose of pre-lithiation of the silicon-based negative electrode is accurately achieved, and the first coulombic efficiency and the energy density of the sulfide all-solid-state battery are improved. Meanwhile, the volume expansion of the silicon-based material is relieved to a certain extent, and the cycle life of the all-solid-state battery is prolonged.
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