Grafting strategy achieving self‐healing polymer/sulfide electrolyte for high‐performance solid‐state lithium–silicon batteries

作者：Xiaoyan Wang, Shenggong He, Zheng Hu, Hao Xu, Likun Pan, Jinliang Li · 发表于：Rare Metals · 年份：2025 · DOI：10.1007/s12598-025-03412-w · 被引用次数：10 · 研究领域：Advancements in Battery Materials、Advanced Battery Materials and Technologies、Advanced Battery Technologies Research

Abstract Severe structural fractures and persistent side reactions at the interface with liquid electrolytes have hindered the commercialization of silicon (Si) anodes. Solid‐state electrolytes present a promising solution to address these issues. However, the high interfacial resistance of rigid ceramic electrolytes and the limited ionic conductivity of polymer electrolytes remain significant challenges, further complicated by the substantial volume expansion of Si. In this work, we chemically grafted a flame‐retardant, self‐healing polyurethane‐thiourea polymer onto Li 7 P 3 S 11 (SHPUSB‐40%LPS) via nucleophilic addition, creating an electrolyte with exceptional ionic conductivity, high elasticity, and strong compatibility with Si anodes. We observed that FSI − was strongly adsorbed onto the LPS surface through electrostatic interactions with sulfur vacancies, enhancing Li + transport. Furthermore, SHPUSB‐40%LPS exhibits dynamic covalent disulfide bonds and hydrogen bonds, enabling self‐assembly of the electrolyte at the interface. This dynamic bonding provides a self‐healing mechanism that mitigates structural changes during Si expansion and contraction cycles. As a result, the Si anode with SHPUSB‐40%LPS presents excellent cycling stability, retaining nearly 53.5% of its capacity after 300 cycles. The practical applicability of this design was validated in a 2 Ah all‐solid‐state Si||LiNi 0.6 Mn 0.2 Co 0.2 O 2 pouch cell, which maintained a stable Li‐ion storage capacity r...