期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 11, 期 4, 页码 1676-1683出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d2ta08139c
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In this study, nanostructured solid polymer electrolytes (SPEs) with functionally separated ion transporting channels and solid-phase walls were successfully synthesized. These SPEs exhibit high ionic conductivity and mechanical strength, and show promising performance in solid-state lithium metal batteries.
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 ion-conductive 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 10-30 wt% amphiphilic ionic liquids, free-standing Bi-SPE films were successfully obtained by photopolymerization and then implemented in lithium metal batteries. At 10 wt% of amphiphilic ionic liquids, the ionic conductivity increased up to 1.4 mS cm(-1) keeping the mechanical strength at 0.8 MPa. A LiFePO4-paired lithium metal cell exhibits a stable discharge capacity of 121.9 mA h g(-1) with 90.3% capacity retention (CE = 99.9%) over 300 cycles at 0.5 C and 30 degrees C.
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