Constructing a Robust Solid–Electrolyte Interphase Layer via Chemical Prelithiation for High‐Performance SiOxAnode

• DOI: 10.1002/aesr.202200083
• Publication Date: 2022-08-05T01:33:55Z
• Authors: Shiming Chen; Zijian Wang; Lu Wang; Zhibo Song; Kai Yang; Wenguang Zhao; Lele Liu; Jianjun Fang; Guoyu Qian; Feng Pan; Luyi Yang
• Keywords: lithium-ion batteries; prelithiation; TJ807-830; 02 engineering and technology; Environmental technology. Sanitary engineering; 7. Clean energy; Renewable energy sources; initial coulombic efficiencies; solid–electrolyte interphases; 0210 nano-technology; SiOx anodes; TD1-1066

Being considered as a promising anode material for next‐generation lithium‐ion batteries, silicon oxide (SiOx) suffers from low initial coulombic efficiency and unstable solid–electrolyte interphase (SEI), which hinder its commercial use. To address these issues, herein, an optimized chemical prelithiation method is developed using a molecularly engineered lithium–biphenyl‐type complex, which facilitates improved prelithiation efficiency. More importantly, owing to the reaction between the prelithiation agent and sodium carboxymethyl cellulose binder, a stable artificial SEI layer with hard inorganic particles embedded in soft organic matrix can be preformed on the surface of the SiOxanode after prelithiation. The preformed SEI layer remains stable during long‐term cycling, contributing to significant improvement of capacity retention (87.4%) over pristine SiOx(68.6%) after 100 cycles at 0.2 C. Through demonstrating a hitherto unknown interfacial constructing strategy for SiOx, this study provides a fresh perspective on realizing high‐capacity Si‐based anodes.