Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7727735 | Journal of Power Sources | 2016 | 6 Pages |
Abstract
For the lithium super-ionic conductor Li10GeP2S12, the partial substitution of sulfur by oxygen is achieved via a solid-state reaction. The solid-solution range of oxygen is found to be 0 â¤Â x < 0.9 in Li10GeP2S12âxOx. Structure refinements using synchrotron X-ray diffraction data confirm the preference for oxygen substitution in the PS4 tetrahedra. The local structural change in the P(S/O)4 tetrahedra upon substitution is also indicated by Raman spectroscopy. Ionic conduction properties are maintained even after the oxygen substitution in Li10GeP2S12; the ionic conductivity of Li10GeP2S12âxOx (0.3 â¤Â x â¤Â 0.6) ranges from 1.03 Ã 10â2 to 8.43 Ã 10â3 S cmâ1 at 298 K. No redox current is observed by cyclic voltammetry from nearly 0 to 10 V versus Li/Li+ except for that due to the lithium deposition/dissolution reactions. All-solid-state batteries using Li10GeP2S12âxOx (x = 0.3 and 0.6) as solid electrolytes with Li metal anodes show discharge capacities exceeding 100 mAh gâ1 and better cycling performance compared to batteries using the original Li10GeP2S12. The partial substitution of oxygen for sulfur in Li10GeP2S12 affords a novel solid electrolyte, Li10GeP2S12âxOx, with high conductive properties and electrochemical stability.
Related Topics
Physical Sciences and Engineering
Chemistry
Electrochemistry
Authors
Yulong Sun, Kota Suzuki, Kosuke Hara, Satoshi Hori, Taka-aki Yano, Masahiko Hara, Masaaki Hirayama, Ryoji Kanno,