SnS_2纳米花/石墨烯纳米复合物的一步法合成及其增强的锂离子存储性能（英文）  

One-Step Synthesis of SnS_2 Nanoflower/Graphene Nanocomposites with Enhanced Lithium Ion Storage Performance

作　　者：田爱华[1,2] 魏伟[1,2] 瞿鹏[1,2] 夏修萍 申琦[1] 

机构地区：[1]郑州大学化学与分子工程学院,郑州450001 [2]商丘师范学院化学化工学院河南省生物分子识别与传感重点实验室,河南商丘476000

出　　处：《物理化学学报》2017年第8期1621-1627,共7页Acta Physico-Chimica Sinica

基　　金：supported by the National Natural Science Foundation of China(21575131);the Key Scientific Research Project of High Schools in Henan Province(16A430025,17A480009)~~

摘　　要：SnS_2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Sn S_2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SnS_2纳米花/石墨烯(SnS_2 NF/GNs)纳米复合物。其中花状SnS_2由超薄纳米片组装而成,石墨烯纳米片将SnS_2包裹在其中。将该材料用作锂离子电池负极时,SnS_2 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SnS_2和石墨烯的协同效应。纳米结构的SnS_2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SnS_2体积的膨胀,而且可以提高纳米复合物的导电性。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.

关 键 词：锂离子电池 负极 SnS2纳米花 石墨烯 

分 类 号：TB332[一般工业技术—材料科学与工程] TM912[电气工程—电力电子与电力传动]