Electrochemical lithium deposition-dissolution reaction of a Ti modified multi-layered solid electrolyte sheet

Abstract

Multi-layered solid electrolyte sheets (OHARA sheet (Ohara Inc. Kanagawa, Japan)/lithium phosphorus oxynitride (LiPON)) with a copper current collector film on the LiPON side were prepared, and the effects of Ti modification at the OHARA sheet/LiPON interface on the electrochemical lithium deposition- dissolution reaction were investigated. Lithium plating-stripping current in cyclic voltammograms increased with an appropriate amount of Ti modification, indicating that Li+ transfer resistance at the OHARA sheet/LiPON interface decreased due to the modification. In addition, the Ti modification stabilized the electrochemical lithium deposition-dissolution reaction. This suggested that Ti modification increase the number of Li+ transfer sites at the interface, resulting in a good distribution of nucleation reaction sites on the copper film as well as the stabilization of the current collector film.