Synthesis of New Lithium Ionic Conductor Thio-LISICON—Lithium Silicon Sulfides System

The new lithium ionic conductors, thio-LISICON (LIthium SuperIonic CONductor), were found in the ternary Li 2S–SiS 2–Al 2S 3 and Li 2S–SiS 2–P 2S 5 systems. Their structures of new materials, Li 4+ x Si 1− x Al x S 4 and Li 4− x Si 1− x P x S 4 were determined by X-ray Rietveld analysis, and the ele...

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Bibliographic Details
Published in:	Journal of solid state chemistry Vol. 168; no. 1; pp. 140 - 148
Main Authors:	Murayama, Masahiro, Kanno, Ryoji, Irie, Michihiko, Ito, Shinya, Hata, Takayuki, Sonoyama, Noriyuki, Kawamoto, Yoji
Format:	Journal Article
Language:	English
Published:	San Diego, CA Elsevier Inc 01-10-2002 Elsevier
Subjects:	Applied sciences Direct energy conversion and energy accumulation Electrical engineering. Electrical power engineering Electrical power engineering Electrochemical conversion: primary and secondary batteries, fuel cells Exact sciences and technology lithium ion conductor lithium silicon sulfide thio-LISICON lithium ion conductor lithium silicon sulfide thio-LISICON Electrical properties Ionic conductors Lithium batteries Secondary cell Chemical synthesis Silicon sulfides Superionic conductor Lithium sulfide
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Summary:	The new lithium ionic conductors, thio-LISICON (LIthium SuperIonic CONductor), were found in the ternary Li 2S–SiS 2–Al 2S 3 and Li 2S–SiS 2–P 2S 5 systems. Their structures of new materials, Li 4+ x Si 1− x Al x S 4 and Li 4− x Si 1− x P x S 4 were determined by X-ray Rietveld analysis, and the electric and electrochemical properties were studied by electronic conductivity, ac conductivity and cyclic voltammogram measurements. The structure of the host material, Li 4SiS 4 is related to the γ-Li 3PO 4-type structure, and when the Li + interstitials or Li + vacancies were created by the partial substitutions of Al 3+ or P 5+ for Si 4+, large increases in conductivity occur. The solid solution member x=0.6 in Li 4− x Si 1− x P x S 4 showed high conductivity of 6.4×10 –4 S cm −1 at 27°C with negligible electronic conductivity. The new solid solution, Li 4− x Si 1− x P x S 4, also has high electrochemical stability up to ∼5 V vs Li at room temperature. All-solid-state lithium cells were investigated using the Li 3.4Si 0.4P 0.6S 4 electrolyte, LiCoO 2 cathode and In anode.
ISSN:	0022-4596 1095-726X
DOI:	10.1006/jssc.2002.9701