中文摘要：

SnS2由于具有较高的储锂容量（645 mAh·g-1）、价格低廉等优点而受到研究者的广泛关注。但纯SnS2在脱嵌锂过程中存在严重的体积膨胀效应，造成活性物质粉化和剥落，从而导致容量的迅速衰减。针对这一问题，本文采用简单的一步溶剂热法制备了SnS2纳米花/石墨烯（SnS2 NF/GNs）纳米复合物。其中花状SnS2由超薄纳米片组装而成，石墨烯纳米片将SnS2包裹在其中。将该材料用作锂离子电池负极时，SnS2 NF/GNs表现出优越的电化学性能，如：循环200圈后可逆容量仍可达523 mAh·g-1复合物材料提高的储锂性能得益于SnS2和石墨烯的协同效应。纳米结构的SnS2可以有效的缓冲体积的膨胀，缩短锂离子的扩散距离。石墨烯纳米片不仅可以进一步缓冲SnS2体积的膨胀，而且可以提高纳米复合物的导电性。

英文摘要：

SnS2 is considered as an attractive anode material to substitute commercial graphite anodes of lithium-ion batteries due to its high specific capacity of 645 mAh·g-1 as well as low cost. Nevertheless, it suffers poor large volume expansion during the lithiation/delithiation processes, leading to the loss of electrical contact and rapid capacity fading. Herein, by using a facile one-step solvothermal method, SnS2 nanoflower/graphene nanocomposites （SnS2 NF/GNs） were prepared, where flower-like SnS2 hierarchical nanostructures consisting of ultrathin nanoplates, are tightly enwrapped in graphene nanosheets. As anode materials for lithium-ion batteries, the SnS2 NF/GNs electrode exhibit superior electrochemical performance, with a reversible capacity of 523 mAh·g-1 after 200 charge-discharge cycles. The enhanced Li storage performance was attributed to the synergistic effect of SnS2 and graphene. The SnS2 NF can effectively accommodate the volume change and shorten Li＋ diffusion distance, while graphene nanosheets can further alleviate the volume expansion of SnS2 and improve the electronic conductivity.