Polymer-based solid-state electrolytes provide significant advantages in flexibility, lightweight characteristics, and scalability, rendering them highly promising for high-performance solid-state lithium metal batteries with improved safety. Nonetheless, obstacles, such as inadequate structural uniformity, slow Li+ transport kinetics, and insufficient interfacial compatibility, impede their practical utilization. This research employs the distinctive porous architecture of zeolite to restrict the mobility of ionic liquid EMIMTFSI, resulting in the synthesis of an innovative filler IL@Zeolite, which is integrated with PVDF-HFP to create composite polymer electrolytes. The filler decreases polymer crystallinity, aids in the dissociation of lithium salts, and creates new pathways for Li+ transport, thereby significantly enhancing the Li+ transfer kinetics. A conductivity of 0.89 mS cm–1 and Li+ transference number of 0.67 are attained. Simultaneously, it generates an SEI layer with a high LiF content, efficiently bridging the interface between the electrolyte and electrode. As a result, the fabricated lithium symmetric battery can consistently cycle for over 7000 h at a current density of 0.1 mA cm–2, whereas the solid-state LFP battery exhibits a capacity retention of 96.5% after 370 cycles at 0.2C (1C = 170 mAh g–1) and 86% after 500 cycles at 1C. The constructed solid-state lithium–oxygen battery can reliably cycle beyond 400 cycles. This offers a novel approach to enhance the efficacy of polymer solid-state electrolytes.
Zhang et al. (Tue,) studied this question.