| 초록 |
Glass is well known as an electric insulator. However, it has been shown that this commonly known knowledge is not scientifically correct, and “superionic conducting glasses” are developed by the authors. Some glasses developed show the ionic conductivity of the order of 10-2 S/cm at room temperature, which corresponds to the conductivity of 5% sodium chloride solution. Sulfide glasses based on lithium sulfide and other metal sulfides are extensively searched in these days to find high lithium ion conductors. Two new routes are found to improve the lithium ion conductivity in the glasses. One is a combination of a small amount of oxides with sulfide-based glasses. The other is the crystallization of glasses to produce “glass-ceramics” which include some meta-stable crystalline phase with high conductivities. All-solid-state cells using these glassy and glass-ceramic solid electrolytes were fabricated and exhibited excellent cycling performance with high capacity. In conclusion, superionic conducting glasses are promising solid electrolytes for all-slid-state devices. |
