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Effect of excess Li 2 S on electrochemical properties of amorphous li 3 ps 4 films synthesized by pulsed laser deposition
Author(s) -
Quan Zhen,
Hirayama Masaaki,
Sato Daichi,
Zheng Yueming,
Yano Takaaki,
Hara Kosuke,
Suzuki Kota,
Hara Masahiko,
Kanno Ryoji
Publication year - 2017
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.14579
Subject(s) - amorphous solid , raman spectroscopy , lithium (medication) , materials science , pulsed laser deposition , analytical chemistry (journal) , stoichiometry , thin film , laser ablation , impurity , conductivity , laser , chemistry , crystallography , nanotechnology , optics , physics , medicine , organic chemistry , chromatography , endocrinology
Amorphous Li 3 PS 4 films were synthesized by pulsed laser deposition (PLD) at room temperature using Li 3 PS 4 targets with excess lithium and sulfur. Raman and X‐ray photoemission spectroscopies indicated that the Li 3 PS 4 film synthesized with a stoichiometric amount of Li 3 PS 4 target contained lithium‐deficient phases such as Li 4 P 2 S 6 , Li 2− x S and sulfur due to composition deviation caused during the ablation process. The film synthesized with a 14% Li 2 S‐excess target (Li 3.42 PS 4.21 ) contained fewer impurities, and exhibited a higher ionic conductivity of 5.3 × 10 −4 S/cm at 298 K than the lithium‐deficient film (3.1 × 10 −4 S/cm). The target composition is an important factor for the fabrication of highly conductive Li 3 PS 4 films for electrolytes in thin‐film batteries.