Stabilizing lithium plating-stripping reaction between a lithium phosphorus oxynitride glass electrolyte and copper thin film by platinum insertion

作者：Okita Kengo; Ikeda Ken ichi; Sano Hikaru; Iriyama Yasutoshi^*; Sakaebe Hikari

来源：Journal of Power Sources, 2011, 196(4): 2135-2142.

DOI：10.1016/j.jpowsour.2010.10.014

• All-solid state lithium batteries
• Lithium metal anode
• Thin film
• Interface

Lithium (Li) plating-stripping reaction properties at the lithium phosphorus oxynitride glass electrolyte (UPON)/copper thin film (Cu) interface is improved by the insertion of nano-thickness platinum (Pt) layer at the interface The UPON films are formed on mirror-polished lithium-ion conductive solid electrolyte sheets and current collector thin films of Li Cu-Pt multi layer and Cu are formed on the UPON films The plating-stripping reactions at the UPON/current collector films interface are carried out by galvanostatic and potential sweep measurements Galvanostatic measurements reveal that Pt layer insei non reduces the overvoltage of the reaction and improves its coulomb efficiency Also cyclic voltammetry measurement suggests formation of Li-Pt alloys at higher voltages than 0V (vs Li/Li(+)) during the lithium plating process Scanning electron microscopy observation clarifies that platinum insertion moderate non-uniform lithium plating reaction Most probably Li-Pt alloys increase the reaction sites resulting in both the stabilization of current collector and the reduction of the overvoltage of the lithium platin

• 出版日期2011-2-15