Solid polymer electrolytes of ionic liquids a bicontinuous ion transport channel for 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 r...

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Published in:Journal of materials chemistry. A, Materials for energy and sustainability Materials for energy and sustainability, 2023-01, Vol.11 (4), p.1676-1683
Main Authors: Cho, Won-Jang, Cho, Seok-Kyu, Lee, Jun Hyuk, Yoon, Jeong Hoon, Kwon, Sangwoo, Park, Chanui, Lee, Won Bo, Yoo, Pil J, Lee, Minjae, Park, Sungkyun, Kang, Tai Hui, Yi, Gi-Ra
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Summary: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 LiFePO 4 -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 °C. Polymer electrolytes with bicontinuous nanostructures for lithium metal batteries were prepared by UV-polymerization of hydrophobic domains in microemulsions of ionic liquids, amphiphilic ionic liquids, lithium salts and monomers.
ISSN:2050-7488
2050-7496
DOI:10.1039/d2ta08139c