UV Curved PESF-LLZTO Composite Solid Electrolyte to In Situ Construct Ultrastable Interface for All Solid-State Lithium Battery

Optimizing interfacial contact between electrolyte and electrode is one of key factors to achieve stable all solid-state lithium batteries (ASSLBs). In this work, UV curving technique is reported to produce ASSLBs by in situ constructing integrated interface between PESF-LLZTO composite solid electrolytes (CSEs) and LiFePO 4 (LFP) cathode. Benefiting from the integral structure and ultrastable properties of the as-prepared CSE/LFP interface, the obtained ASSLBs delivers an initial discharge specific capacities of 162.8 mAh g −1 at 0.1 C and 30 °C, and successfully runs over 520 cycles at 0.5 C with a discharge capacity retention ratio of 96.3%.