Xie Xiuqiang, Su Dawei, Chen Shuangqiang, Zhang Jinqiang, Dou Shixue, Wang Guoxiu
Centre for Clean Energy Technology, School of Chemistry and Forensic Science, University of Technology Sydney, Broadway, Sydney, NSW 2007 (Australia), Fax: (+61) 2-9514-1460.
Chem Asian J. 2014 Jun;9(6):1611-7. doi: 10.1002/asia.201400018. Epub 2014 Apr 11.
Na-ion batteries have been attracting intensive investigations as a possible alternative to Li-ion batteries. Herein, we report the synthesis of SnS2 nanoplatelet@graphene nanocomposites by using a morphology-controlled hydrothermal method. The as-prepared SnS2/graphene nanocomposites present a unique two-dimensional platelet-on-sheet nanoarchitecture, which has been identified by scanning and transmission electron microscopy. When applied as the anode material for Na-ion batteries, the SnS2/graphene nanosheets achieved a high reversible specific sodium-ion storage capacity of 725 mA h g(-1), stable cyclability, and an enhanced high-rate capability. The improved electrochemical performance for reversible sodium-ion storage could be ascribed to the synergistic effects of the SnS2 nanoplatelet/graphene nanosheets as an integrated hybrid nanoarchitecture, in which the graphene nanosheets provide electronic conductivity and cushion for the active SnS2 nanoplatelets during Na-ion insertion and extraction processes.
钠离子电池作为锂离子电池的一种可能替代方案，一直吸引着广泛的研究。在此，我们报告了通过一种形貌控制的水热法合成SnS2纳米片@graphene纳米复合材料。所制备的SnS2/石墨烯纳米复合材料呈现出独特的二维片上片状纳米结构，这已通过扫描和透射电子显微镜得到证实。当用作钠离子电池的负极材料时，SnS2/石墨烯纳米片实现了725 mA h g(-1)的高可逆比钠离子存储容量、稳定的循环性能以及增强的高倍率性能。可逆钠离子存储的电化学性能改善可归因于SnS2纳米片/石墨烯纳米片作为一种集成混合纳米结构的协同效应，其中石墨烯纳米片在钠离子嵌入和脱嵌过程中为活性SnS2纳米片提供电子导电性和缓冲作用。
