Empowering all-solid-state Li-ion batteries with self-stabilizing Sn-based anodes

초록

All-solid-state Li-ion batteries (ASSLIBs) are promising but face several challenges, especially regarding Li-metal anodes prone to dendrite formation and Si-based anodes with limited performance. To address this issue, we propose a self-stabilizing Sn-based anode. While Sn anodes suffer from agglomeration during cycling, transition metal-Sn anodes, specifically FeSn2 anodes, self-stabilize during cycling by exhibiting uniformity and densification without cycling-induced agglomeration, owing to their unique electrochemical-cycling-induced size reduction and distinctive mechanical properties. A full cell with an FeSn2 anode, a LiNi 0.6 Co 0.2 Mn 0.2 O 2 cathode, and a Li6PS5Cl solid electrolyte exhibits highly reversible areal capacity (15.54 mAh cm- 2 at 100 mg cm- 2 cathode loading), excellent rate capability (74.5%/83.2% retention over 1,000 cycles at 10/20 C), and exceptional energy density at high current densities. The self-stabilizing FeSn2 anodes offer high energy density, compatibility with solid electrolytes, safety, wide operating temperature range, cost effectiveness, and scalability, thereby accelerating the realization of superior ASSLIBs.

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