Gallium (III) sulfide as an active material in lithium secondary batteries

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• 作者：Hiroshi Senoh^a ; ^{h.senoh@aist.go.jp"" rel=""nofollow} ; Hiroyuki Kageyama^a ; Tomonari Takeuchi^a ; Koji Nakanishi^b ; Toshiaki Ohta^b ; Hikari Sakaebe^a ; Masaru Yao^a ; Tetsuo Sakai^a ; Kazuaki Yasuda^a
• 关键词：Lithium secondary battery ; Gallium (III) sulfide ; Capacity retention ; Rate capability ; X-ray diffraction ; X-ray absorption fine structure
• 刊名：Journal of Power Sources
• 出版年：2011
• 出版时间：1 July 2011
• 年：2011
• 卷：196
• 期：13
• 页码：5631-5636
• 全文大小：607 K

文摘

In an attempt to identify an active material for use in lithium secondary batteries with high energy density, we investigated the electrochemical properties of gallium (III) sulfide (Ga₂S₃) at 30 °C. Ga₂S₃ shows two sloping plateaus in the potential range between 0.01 V and 2.0 V vs. (Li/Li⁺). The specific capacity of the Ga₂S₃ electrode in the first delithiation is ca. 920 mAh g⁻¹, which corresponds to 81 % of the theoretical capacity (assuming a 10-electron reaction). The capacity in the 10th cycle is 63 % of the initial capacity. Ex situ X-ray diffraction and X-ray absorption fine structure analyses revealed that the reaction of the Ga₂S₃ electrode proceeds in two steps: Ga₂S₃ + 6Li⁺ + 6e⁻  2Ga + 3Li₂S and Ga + xLi⁺ + xe⁻  Li_xGa.