A high-rate silicon-based negative electrode solid-state battery and a preparation method thereof

By using a core-shell structure of lithium polyacrylate@nano-silicon/N-doped porous carbon in a silicon-based anode, the problem of electrode pulverization caused by the volume expansion of the silicon anode was solved, and a solid-state battery with high rate and excellent cycle performance was achieved.

CN122118102APending Publication Date: 2026-05-29YANCHENG INST OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
YANCHENG INST OF TECH
Filing Date
2026-03-04
Publication Date
2026-05-29

AI Technical Summary

Technical Problem

The dramatic volume expansion of silicon anodes during charging and discharging leads to mechanical pulverization of the electrode structure and deterioration of interfacial dynamics, affecting the high-rate performance and cycle life of solid-state batteries.

Method used

Lithium polyacrylate@nano-silicon/N-doped porous carbon is used as the negative electrode active material. Through the core-shell structure design, the nano-silicon particles are uniformly dispersed in the porous carbon, the carbon wall provides buffer space and mechanical support, and the lithium polyacrylate provides lithium source and adhesion force to form a stable interface film.

Benefits of technology

It significantly improves the rate performance and cycle stability of solid-state batteries, suppresses the pulverization of electrode materials, and enhances the first coulombic efficiency and the integrity of the electrode structure.

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Abstract

The application relates to the technical field of solid-state batteries, in particular to a high-rate silicon-based negative electrode solid-state battery and a preparation method thereof. The silicon-based negative electrode solid-state battery prepared by the application comprises a silicon-based negative electrode, a sulfide solid-state electrolyte and a positive electrode; wherein the silicon-based negative electrode is formed by pressing a silicon-based negative electrode material, and the silicon-based negative electrode material is a mixture of lithium polyacrylate@nanosilicon / N-doped porous carbon, a sulfide solid-state electrolyte and a conductive agent; the lithium polyacrylate@nanosilicon / N-doped porous carbon in the application is used as a negative electrode active material and is different from traditional nanosilicon, and can significantly improve the rate performance and cycle stability of the solid-state battery.
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