Chemically Evolved Composite Lithium-Ion Conductors with Lithium Thiophosphates and Nickel Sulfides

Title
Chemically Evolved Composite Lithium-Ion Conductors with Lithium Thiophosphates and Nickel Sulfides
Authors
이종호안재평김형철정훈기박만수윤빈나최성준정으뜸안준성조수영이윤성임재민성주영장용준
Keywords
solid electrolytes; lithium-ion conductors; all-solid-state batteries; lithium thiophosphates; sulfur deficiency; nickel sulfides
Issue Date
2017-07
Publisher
ACS energy letters
Citation
VOL 2-1745
Abstract
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.
URI
http://pubs.kist.re.kr/handle/201004/65909
ISSN
2380-8195
Appears in Collections:
KIST Publication > Article
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