We introduced a new elastic interface layer (EIL), (Li₂S)_0.75(P₂S₅)_0.25 glass, in all-solid-state batteries (ASSBs) to improve the solid-state interfacial structure, and analyzed its structural evolution in electrochemical charge/discharge cycles. This EIL had a lower bulk modulus, thereby providing good powder processability and high mechanical deformability against volume changes of the electrode. Compared to a cell configuring EIL, the reference cell exhibited a considerable increase in the electrolyte resistance; moreover, a new resistance component was identified in the high-frequency region (500–50 kHz). This high-resistance component resulting from interfacial deterioration such as metal fragmentation and micropore formation was successfully suppressed by applying a mechanically deformable EIL. We believe that this study would provide insights into the application of EIL for configuring a stable interface with a metallic electrode in ASSBs.

我们引入了一个新的弹性界面层（EIL），（Li ₂ S）_0.75（P ₂ S ₅）_0.25全固态电池（ASSB）中的玻璃，以改善固态界面结构，并分析了其在电化学充电/放电循环中的结构演变。该EIL具有较低的体积模量，从而提供了良好的粉末加工性和针对电极的体积变化的高机械变形性。与配置EIL的电池相比，参比电池的电解质电阻显着提高；此外，在高频区域（500–50 kHz）中发现了新的电阻成分。通过施加可机械变形的EIL，成功抑制了因界面劣化（例如金属碎裂和微孔形成）导致的高电阻成分。