All-solid-state lithium metal batteries (ASSLMBs) that incorporate solid electrolyte (SE) and lithium metal anode suggest considerable potential in addressing the security concerns and energy density limitation of conventional lithium-ion batteries (LIBs). However, the practical application of ASSLMBs is always restricted by the interfacial instability of lithium metal anode/electrolyte and inevitable lithium dendrites propagation in SE. Herein, a solvate ionic liquid is adopted to modify the interface stability of lithium metal anode/electrolyte and inhibit the growth of lithium dendrites via an in-situ formation of a robust solid electrolyte interphase (SEI) on the surface of lithium metal anode. Consequently, the ASSLMBs assembled with Li₆PS₅Cl (LPSCl) electrolyte, lithium metal anode that protected by robust SEI layer, and LiNbO₃@NCM622 cathode exhibit high initial capacity of 126.5 mAh·g⁻¹ and improved cycling stability with a capacity retention of 80.3% over 60 cycles at 0.1 C. This work helps to provide a facile route for the design of robust SEI in the application of ASSLMBs.

包含固体电解质 (SE) 和锂金属阳极的全固态锂金属电池 (ASSLMB) 在解决传统锂离子电池 (LIB) 的安全问题和能量密度限制方面具有相当大的潜力。然而，ASSLMBs 的实际应用总是受到锂金属阳极/电解质界面不稳定性和 SE 中不可避免的锂枝晶传播的限制。在此，采用溶剂化离子液体来改变锂金属负极/电解质的界面稳定性，并通过在锂金属负极表面原位形成坚固的固体电解质界面（SEI）来抑制锂枝晶的生长。_{因此，用 Li 6} PS ₅组装的 ASSLMBCl (LPSCl) 电解质、由坚固的 SEI 层保护的锂金属负极和 LiNbO ₃ @NCM622 正极表现出 126.5 mAh·g ⁻¹的高初始容量和改进的循环稳定性，在 0.1 C 下超过 60 次循环后容量保持率为 80.3% . 这项工作有助于为在 ASSLMB 应用中设计稳健的 SEI 提供一条简便的途径。