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Room Temperature Operation of All-Solid-State Potassium-Ion Battery Enabled by Unconventional Ionic Solid Electrolyte
Ryo Sakamoto1, Kosuke Nakamoto1, Atsushi Inoishi1
1Institute for Materials Chemistry and Engineering, Kyushu University, 6-1 Kasuga-koen, Kasuga, 816-8580, Japan.
Abstract:
The unconventional ionic solid, K6[Rh4Zn4(L-cys)12O]·nH2O, exhibited excellent formability as well as high ionic conductivity. These features enabled a straightforward assembly of all-solid-state potassium-ion battery: A cold-pressed solid sample of K6[Rh4Zn4(L-cys)12O]·nH2O, which was sandwiched by solid samples of K2Ni[Fe(CN)6] and chloranil as cathode, and anode, respectively, displayed an initial discharge capacity of 21.6 mAh g-1-electrodes at 25 °C at a current density of 0.5 mA cm-2 (∼0.34C). Energy dispersive X-ray spectroscopy analysis confirmed that K+ ions swiftly conduct through K6[Rh4Zn4(L-cys)12O]·nH2O between the cathode and anode during charge-discharge cycles.
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