A modified PVDF-HFP/PMMA crosslinked co-polymer for high-performance all-solid-state lithium metal batteries

For all-solid-state lithium batteries (ASSLBs), polymer-blended solid composite electrolytes (SCEs) have drawn wide interest owing to their significance in improving the interfacial solid-solid contacts and inhibiting the growth of lithium dendrites . In this work, SCEs based on PVDF-HFP/PMMA matrix containing MOFs (NH 2 -MIL-53(Al)) and LiTFSI were designed and synthesized employing an easy solution casting method. The synthesized samples were examined by XRD , SEM, EDS , and electrochemical tests. It was found that MPP-2 SCE not only has excellent ionic conductivity at 60 °C of 5.54 × 10 −4  S cm −1 , but also exhibits superior interfacial compatibility in Li||Li symmetric batteries , which can constantly cycle for about 800 h at 0.1 mA cm −2 with no short-circuiting. The assembled Li|MPP-2|LiFePO 4 cell exhibited a first discharge specific capacity of up to 157.1 mAh g −1 at 60 °C and 0.2 C. This work may help to further advance the progress of ASSLBs in the future.