Proceedings of MATSUS23 & Sustainable Technology Forum València (STECH23) (MATSUS23)
DOI: https://doi.org/10.29363/nanoge.matsus.2023.271
Publication date: 22nd December 2022
All-solid-state batteries (ASSBs) with sulfide-based solid electrolytes (SEs) have been considered the most promising next-generation energy storage system due to their high energy density. Silicon (Si) has been intensively studied as an anode material due to the high theoretical capacity (3572 mAh g-1, Li15Si4) and a relatively low working voltage (~0.5 V vs Li/Li+) in ASSBs. However, poor electrochemical properties caused by the large volume change (~ 300%) and low electronic conductivity of Si have limited its practical use. Here, we report Si nanoparticles embedded in carbon nanofiber (CNF) coated with solid electrolyte (LPSCl) (Si/CNF@LPSCl) as anode material to achieve high energy density and cycle stability for ASSBs. The CNF is a desirable host matrix for the Si nanoparticles due to its good mechanical property and high electronic conductivity. The conformal coating of SE on the surface of Si/CNF composite enhances the interfacial stability between the active material and the SE, which leads to the improvement in electrochemical properties by suppressing the contact loss. The Si/CNF@LPSCl composite electrode exhibits a reversible capacity of ~ 1172 mAh g-1 at 0.1C and stable cyclability of ~ 84.3% at 0.5C after 50 cycles.
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