차세대 리튬이차전지를 위한 산화물 고체전해질의 연구동향

Research progress of oxide solid electrolytes for next-generation Li-ion batteries

Since the electrification of vehicles has been extended, solid-state batteries have been attracting a lot of interest because of their superior safety. Especially, polymer, sulfide, and oxide based materials are being studied as solid electrolytes, and each type of materials has advantaged and disadvantages over others. Oxide electrolytes has higher chemical and electrochemical stability compared to the other types of electrolytes. However, ionic conductivity isn’t high enough as much as that of organic liquid electrolytes. Also, there are many difficulties of fabricating solidstate batteries with oxide based electrolytes because they require a sintering process at very high temperature (above ~800 ℃). Herein, we review recent studies of solid-state batteries with oxide based electrolytes about the ionic conductivity, interfacial reactions with Li metal, and preparation of solid-state cell.