Solid-state thin-film rechargeable batteries

Abstract

Thin-film solid-state rechargeable lithium batteries are ideal micropower sources for many applications requiring high energy and power densities, good capacity retention for thousands of discharge/charge cycles, and an extremely low self-discharge rate. Batteries fabricated using the crystalline LiCoO 2 cathode consistently provide the maximum power levels up to 30 mW/cm 2, long cycle life, negligible self-discharge and rapid charge rates. Similarly promising results have also been obtained with crystalline LiMn 2O 4 cathodes, although good reproducibility has not been achieved. These fully lithiated cathodes can be used with Li-free or Li-ion thin-film anodes to produce batteries that can withstand high temperature solder bonding processes.