Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7745248 | Solid State Ionics | 2016 | 6 Pages |
Abstract
Novel lithium-ion (Li+)-conducting oxysulfides of the Li10GeP2S12 family were found in the ternary Li2S-P2S5-P2O5 system; Li10GeP2S12-type solid solutions with compositions Li3 + 5xP1 â xS4 â zOz (x = 0.03-0.08, z = 0.4-0.8) were confirmed. The solid solutions showed ionic conductivities from 4.14 Ã 10â 5 to 2.64 Ã 10â 4 S cmâ 1 at 298 K and a wide electrochemical window of 0-5.0 V (vs. Li/Li+). Among the solid solutions synthesized, the purest phase had the composition Li3.35P0.93S3.5O0.5 (x = 0.07, z = 0.5). Structural analysis revealed that the novel oxysulfides are isostructural to the original Li10GeP2S12 structure and the (P/â¡)(S/O)4 tetrahedra, which indicates the presence of cation defects with oxygen substitution in the crystal structure. Electrochemical stability of the oxysulfides was confirmed in the voltage range of 0-5.0 V. The solid-electrolyte interphase (SEI) resistivity and its cycle-dependence evaluation for new materials demonstrated that the oxysulfides had lower resistivities and furnished well-contacted SEI layers during the charge-discharge process.
Related Topics
Physical Sciences and Engineering
Chemistry
Electrochemistry
Authors
Kota Suzuki, Masamitsu Sakuma, Satoshi Hori, Tetsuya Nakazawa, Miki Nagao, Masao Yonemura, Masaaki Hirayama, Ryoji Kanno,