Chemically Evolved Composite Lithium-Ion Conductors with Lithium Thiophosphates and Nickel Sulfides
- Chemically Evolved Composite Lithium-Ion Conductors with Lithium Thiophosphates and Nickel Sulfides
- 이종호; 안재평; 김형철; 정훈기; 박만수; 윤빈나; 최성준; 정으뜸; 안준성; 조수영; 이윤성; 임재민; 성주영; 장용준
- solid electrolytes; lithium-ion conductors; all-solid-state batteries; lithium thiophosphates; sulfur deficiency; nickel sulfides
- Issue Date
- ACS energy letters
- VOL 2-1745
- The development and application of all-solid-state batteries with a fast lithium-ionic conductor are hampered by structural instability and rigid stoichiometry restrictions. Here, we present a family of lithium thiophosphate prototypes with a novel principle, controlling sulfur deficiencies with the addition of nickel sulfide-based additives, for fast lithium-ion conduction and distinct electrochemical stability under the extended material constituent. Well-controlled sulfur deficiency of the Li3PS4 framework accompanied by nickel sulfide additive offers the notable increase of lithium-ion conductivity (2 × 10– 3 S  cm– 1 at 25 °C) and high electrochemical stability (up to 10 V vs Li/Li+) in a wide composition range. We further confirm the potential application of our fast composite lithium-ion conductor as an electrolyte for the all-solid-state battery with 117 mAh  g– 1 capacity delivery and stable cycle life.
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