Department of Chemical Engineering and Department of Chemistry, Center for Electrochemistry, University of Texas at Austin , 1 University Station, C0400 Austin, Texas 78712-0231, United States.
Department of Chemistry and the Institute for Computational Engineering and Sciences, University of Texas at Austin , Austin, Texas 78712-0165, United States.
ACS Nano. 2016 Dec 27;10(12):10778-10788. doi: 10.1021/acsnano.6b04214. Epub 2016 Nov 29.
Composites of nitrogen-doped reduced graphene oxide (NRGO) and nanocrystalline tin sulfides were synthesized, and their performance as lithium ion battery anodes was evaluated. Following the first cycle the composite consisted of LiS/LiSn/NRGO. The conductive NRGO cushions the stress associated with the expansion of lithiation of Sn, and the noncycling LiS increases the residual Coulombic capacity of the cycled anode because (a) Sn domains in the composite formed of unsupported SnS expand only by 63% while those in the composite formed of unsupported SnS expand by 91% and (b) Li percolates rapidly at the boundary between the LiS and LiSn nanodomains. The best cycling SnS/NRGO-derived composite retained a specific capacity of 562 mAh g at the 200th cycle at 0.2 A g rate.
合成了氮掺杂还原氧化石墨烯（NRGO）和纳米晶硫化锡的复合材料，并评估了它们作为锂离子电池阳极的性能。在第一次循环后，复合材料由 LiS/LiSn/NRGO 组成。导电 NRGO 缓解了与 Sn 嵌锂膨胀相关的应力，并且非循环 LiS 增加了循环阳极的剩余库仑容量，因为（a）由无支撑 SnS 形成的复合材料中的 Sn 域仅膨胀 63%，而由无支撑 SnS 形成的复合材料中的 Sn 域膨胀 91%，并且（b）Li 在 LiS 和 LiSn 纳米域之间的边界处迅速渗透。在 0.2 A g 速率下，第 200 次循环时，最佳循环 SnS/NRGO 衍生复合材料的比容量保持在 562 mAh g。
