Effect of excess Li₂S on electrochemical properties of amorphous li₃ps₄ films synthesized by pulsed laser deposition

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• 作者：Zhen Quan ; Masaaki Hirayama ; Daichi Sato ; Yueming Zheng ; Taka-aki Yano ; Kosuke Hara ; Kota Suzuki ; Masahiko Hara and Ryoji Kanno
• 刊名：Journal of the American Ceramic Society
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：100
• 期：2
• 页码：746-753
• 全文大小：1181K
• ISSN：1551-2916

文摘

Amorphous Li₃PS₄ films were synthesized by pulsed laser deposition (PLD) at room temperature using Li₃PS₄ targets with excess lithium and sulfur. Raman and X-ray photoemission spectroscopies indicated that the Li₃PS₄ film synthesized with a stoichiometric amount of Li₃PS₄ target contained lithium-deficient phases such as Li₄P₂S₆, Li_2−xS and sulfur due to composition deviation caused during the ablation process. The film synthesized with a 14% Li₂S-excess target (Li_3.42PS_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 Li₃PS₄ films for electrolytes in thin-film batteries.