UiO‐66‐NH2@67 Core–Shell Metal–Organic Framework as Fillers in Solid Composite Electrolytes for High‐Performance All‐Solid‐State Lithium Metal Batteries

Benefiting from employing solid composite electrolytes (SCEs), all‐solid‐state lithium‐ion batteries (ASSLBs) are recognized to occupy with high energy density and safety. Herein, a polymer‐based SCE membrane (SCE‐66@67) with core–shell structured metal–organic frameworks (MOFs) (UiO‐66‐NH 2 @67) as the fillers is presented. The SCE has combined the advantages of the two kinds of MOFs and shows a satisfying ionic conductivity (2.09 × 10 −4 S cm −1 at 60 °C) and a wide electrochemical stability window of ≈5.0 V. The full cell (Li/SCE‐66@67/LiFePO 4 ) also maintains a high capacity of 120.9 mAh g −1 at 3 C. This research might help to promote the development of future SCEs for ASSLBs.