کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1293479 | 973550 | 2011 | 6 صفحه PDF | دانلود رایگان |
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− ⇆ LixGa.
Research highlights
► Ga2S3 is proposed as a novel anode active material in lithium secondary batteries.
► Lithiation/delithiation reactions of Ga2S3 occur during galvanostatic cycles.
► The reaction of Ga2S3 proceeds in two steps at 0.01–2.0 V vs. (Li/Li+).
► The specific capacity in the first delithiation is more than twice that of graphite.
Journal: Journal of Power Sources - Volume 196, Issue 13, 1 July 2011, Pages 5631–5636