Superior electrochemical performance of ultrasmall SnS2 nanocrystals decorated on flexible RGO in lithium-ion batteries
Superior electrochemical performance of ultrasmall SnS2 nanocrystals decorated on flexible RGO in lithium-ion batteries
复制标题
柔性RGO修饰的超小SnS2纳米晶在锂离子电池中的优异电化学性能
DOI：
10.1039/c3ta11269a
复制
发表时间：
2013-01-01
影响因子：
11.9
通讯作者：
Wang, Taihong
中科院分区：
文献类型：
--
作者：
Mei, Lin;Xu, Cheng;Wang, Taihong
利用一种简单的回流方法，成功地实现了在柔性还原氧化石墨烯（RGO）上装饰高效、丰富的超小SnS2纳米晶体的杂化结构。与以往的研究相比，超小型SnS2纳米晶体可以致密有序地覆盖在RGO纳米片上，增加了RGO衬底单位面积上SnS2的负载数量。研究了超小型SnS2 nanocrystals@RGO纳米复合材料作为锂离子电池电极材料。在这种杂化结构中，RGO不仅作为SnS2纳米晶体均匀分布的固体载体，而且作为加速电子传递的载体。此外，RGO纳米片上的SnS2纳米晶体尺寸均匀且均匀，减少了电极极化，使锂离子电池具有优异的电化学性能。特定容量高达1034 mA h g−1实现了从一个超SnS2 nanocrystals@RGO电极即使200次0.1 c。重要的是,在超SnS2 nanocrystals@RGO电极显示优秀能力保留450周期甚至在高速率的5 c .成本效益综合SnS2 nanocrystals@RGO和优秀的电化学性能显示巨大的潜力为这种类型的纳米复合材料作为锂离子电池的主动电极。
A hybrid structure involving efficient plentiful ultrasmall SnS2 nanocrystals decorated on flexible reduced graphene oxide (RGO) has been successfully realized via a simple refluxing method. Compared to previous studies, the ultrasmall SnS2 nanocrystals can compactly and orderly cover the RGO nanosheets, increasing the loading number of SnS2 per unit area of the RGO substrates. The ultrasmall SnS2 nanocrystals@RGO nanocomposites were investigated as electrode materials for lithium-ion batteries. In this hybrid structure, RGO was not only used as a solid support to uniformly distribute the SnS2 nanocrystals, but also as a carrier to accelerate electron transport. In addition, the uniform size and homogeneous SnS2 nanocrystals on the RGO nanosheets reduced electrode polarization, resulting in excellent electrochemical performance for lithium-ion batteries. A specific capacity up to 1034 mA h g−1 was realized from an ultrasmall SnS2 nanocrystals@RGO electrode even after 200 cycles at 0.1 C. Importantly, the ultrasmall SnS2 nanocrystals@RGO electrode showed excellent capacity retention for up to 450 cycles even at a high rate of 5 C. The cost-effective synthesis of SnS2 nanocrystals@RGO and excellent electrochemical performance indicates the great potential for this type of nanocomposites as an active electrode for lithium-ion batteries.