Ye Lei, Wang Daiwei, Lu Qian, Jhang Li-Ji, Kou Rong, Pandey Alok Kumar, Lira Jasiel, Liao Meng, Wang Donghai
Department of Mechanical Engineering, The Pennsylvania State University, University Park, PA, 16802, USA.
Department of Chemical Engineering, The Pennsylvania State University, University Park, PA, 16802, USA.
Adv Mater. 2025 Jun;37(23):e2407724. doi: 10.1002/adma.202407724. Epub 2024 Aug 4.
All-solid-state lithium-sulfur batteries (ASSLSBs) have attracted intense interest due to their high theoretical energy density and intrinsic safety. However, constructing durable lithium (Li) metal anodes with high cycling efficiency in ASSLSBs remains challenging due to poor interface stability. Here, a compositionally stable, self-lithiated tin (Sn)-carbon (C) composite interlayer (LSCI) between Li anode and solid-state electrolyte (SSE), capable of homogenizing Li-ion transport across the interlayer, mitigating decomposition of SSE, and enhancing electrochemical/structural stability of interface, is developed for ASSLSBs. The LSCI-mediated Li metal anode enables stable Li plating/stripping over 7000 h without Li dendrite penetration. The ASSLSBs equipped with LSCI thus exhibit excellent cycling stability of over 300 cycles (capacity retention of ≈80%) under low applied pressure (<8 MPa) and demonstrate improved rate capability even at 3C. The enhanced electrochemical performance and corresponding insights of the designed LSCI broaden the spectrum of advanced interlayers for interface manipulation, advancing the practical application of ASSLSBs.
全固态锂硫电池（ASSLSBs）因其高理论能量密度和本质安全性而备受关注。然而，由于界面稳定性差，在全固态锂硫电池中构建具有高循环效率的耐用锂金属负极仍然具有挑战性。在此，开发了一种锂负极与固态电解质（SSE）之间的成分稳定、自锂化的锡（Sn）-碳（C）复合中间层（LSCI），它能够使锂离子在整个中间层均匀传输，减轻固态电解质的分解，并增强界面的电化学/结构稳定性，用于全固态锂硫电池。由LSCI介导的锂金属负极能够在7000小时以上实现稳定的锂电镀/剥离，且无锂枝晶穿透。配备LSCI的全固态锂硫电池因此在低施加压力（<8 MPa）下表现出超过300次循环的优异循环稳定性（容量保持率约为80%），甚至在3C倍率下也展现出改善的倍率性能。所设计的LSCI增强的电化学性能及相应的见解拓宽了用于界面调控的先进中间层的范围，推动了全固态锂硫电池的实际应用。
