Electrochemical chracteristics of all solid state rechargeable thin film lithium batteries fabricated on a polymer substrate

Abstract

The multilayer films of LiCoO 2 / M / LiCoO 2 / M / LiCoO 2 structure were prepared by a magnetron sputtering without post-annealing 1 . The as-deposited multilayer films exhibited a nanocrystalline structure, which is similar to that of LiCoO 2 single layer films. Electrochemical performances of the LiCoO 2 /M multilayer films and a LiCoO 2 single layer film were investigated at a current density ranging from 30 to 1000 uA/cm 2 , in which for those samples, the total thickness of LiCoO 2 layer is about 4.2um. The enhanced rate capability in the LiCoO 2 /Ag, Pt multilayer films is mainly ascribed to the increase of the electronic conductivity 2 . We have fabricated the all solid state thin film batteries for polymer substrate. As a result, we confirmed high initial irreversible capacity and low cycle ability because of interface and structure instability.