Room-Temperature Fabrication of Flexible Thin-Film Lithium Batteries Based on Solid Electrolytes and Polyimide Substrates
Flexible thin-film lithium batteries can power flexible electronic devices and wearable devices. Here we report room-temperature fabrication of flexible batteries with Li/LiPON/LiFe (WO4)2 active layers on polyimide substrates by sequential magnetron sputtering and thermal evaporation. Inorganic solid electrolyte LiPON films were well prepared to achieve lithium ion conductivity of 1.794×10-6 S/cm in the composition of Li2.7P(O0.99N0.11)4. Due to two redox centers of Fe3+ and W6+ in amorphous LiFe (WO4)2 cathode films, large initial specific capacities of 115.5 μAh/(cm2-μm) and 65.4 μAh/(cm2-μm) are achieved in the flat and bending batteries respectively. After 200 cycles, the discharge capacity remains 27.6 μAh/(cm2-μm). Low-temperature fabrication process of flexible batteries insures the use of lightweight and thin polymer substrates instead of high temperature resistant metal and ceramic substrates.
Seung-Bok Choi and Yun-Hae Kim
M. Chen et al., "Room-Temperature Fabrication of Flexible Thin-Film Lithium Batteries Based on Solid Electrolytes and Polyimide Substrates", Applied Mechanics and Materials, Vol. 723, pp. 664-669, 2015