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Current inorganic solid electrolyte membranes generally suffer thick thickness of hundreds micrometers as well as low ionic conductivity, which limits the energy density and cycle life of all-solid-state lithium batteries. In this work, wet coating is employed to fabricate the Li 6 PS 5 Cl solid electrolyte thin membrane. The interaction among solvents containing different functional groups with the Li 6 PS 5 Cl electrolyte was explored. A new polymeric binder is synthesized by polymerization of dimethyl aminoethyl methacrylate (DMAEMA), polyethylene glycol diacrylate (PEGDA), and lithium bis(trifluoromethanesulfonyl)imide (LiTFSI), showing excellent stability to Li 6 PS 5 Cl solid electrolyte particles and high tensile strength of 1.46 MPa. Thus, a 40-μm-thick freestanding Li 6 PS 5 Cl membrane with 90 wt% Li 6 PS 5 Cl content is realized through in situ photo-polymerization, possessing a relatively high room temperature ionic conductivity of 1.23 mS cm −1 . Moreover, the all-solid-state battery-based Li 6 PS 5 Cl membrane exhibits superior cycling stability after 1,000 cycles with a capacity retention of 76.92% at 0.2 C under 60 °C. When the mass load of the active material LiCoO 2 increases to 15.2 mg cm −2 , the all-solid-state cell still delivers a high initial discharge capacity of 123.0 mAh g −1 (1.87 mAh cm −2 ) with a capacity retention rate of 89.93% after 200 cycles.
Zhao et al. (Wed,) studied this question.