Solid Polymer Electrolyte of Ionic Liquids via a Bicontinuous Ion Transport Channel for Lithium Metal Batteries
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Solid polymer electrolytes (SPEs) are a key component of solid-state lithium metal batteries. For attaining high ionic conductivity and high mechanical strength simultaneously, nanostructured SPEs are designed to have functionally separated ion transporting channels and solid-phase walls. Here, we report ionconductive bicontinuous solid polymer electrolytes (Bi-SPEs) from thermodynamically stable bicontinuous microemulsions of ionic liquids and diacrylates in the presence of amphiphilic ionic liquids and lithium salt. From stable bicontinuous microemulsions with 10–30wt% amphiphilic ionic liquids, free-standing Bi-SPE films were successfully obtained by photopolymerization and then implemented in lithium metal batteries. At 10wt% of amphiphilic ionic liquids, the ionic conductivity increased up to 1.4mS/cm keeping the mechanical strength at 0.8MPa. A LiFePO4-paired lithium metal cell exhibits a stable discharge capacity of 121.9mAh/g with 90.3% capacity retention over 300 cycles at 0.5C and 30°C.