Highly uniform Co9S8 nanoparticles grown on graphene nanosheets as advanced anode materials for improved Li-storage performance
Highly uniform Co9S8 nanoparticles grown on graphene nanosheets as advanced anode materials for improved Li-storage performance
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DOI：
10.1016/j.apsusc.2016.08.092
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发表时间：
2016-12-30
影响因子：
6.7
通讯作者：
Wang, Limin
中科院分区：
文献类型：
--
作者：
Liu, Shumin;Wang, Jinxian;Wang, Limin
以氧化石墨片、CoCl2中心点6H（2）O和硫脲为原料，采用溶剂热法制备了Co9S8/GNS（graphene nanosheets）纳米复合材料。将尺寸约为80 - 90 nm的高度均匀的Co9S8纳米颗粒均匀接枝在GNS表面，形成独特的Co9S8/GNS杂化纳米结构。当作为锂离子电池的负极材料进行评估时，与纯块状Co9S8相比，所制备的纳米复合材料实现了令人印象深刻的电化学性能，具有1480 mAh g（-1）的高可逆容量。此外，所合成的纳米复合材料呈现出优异的循环耐久性和高倍率性能。Co9S8/GNS纳米复合材料的电化学性能的改善可以归因于精心设计的结构，其具有大量的可接近的活性位点用于锂离子插入，快速的离子扩散速率和良好的电子导电性。(C)2016爱思唯尔B.V.保留所有权利。
A Co9S8/GNS (graphene nanosheets) nanocomposites has been synthesized via a facile solvothermal approach followed by thermal treatment in nitrogen at 500 degrees C using graphite oxide sheets, CoCl2 center dot 6H(2)O and thiourea as the starting materials. Highly uniform Co9S8 nanoparticles with a size of about 80-90 nm are evenly grafted on the surface of GNS, forming a unique Co9S8/GNS hybrid nanostructure. When evaluated as anode materials for lithium ion batteries, impressive electrochemical performances of the as-prepared nanocomposites are achieved compared to that of pure bulk Co9S8, with an high reversible capacity of 1480 mAh g(-1). Moreover, the as-synthesized nanocomposites present excellent cycling durability and high-rate capability. The improvement in the electrochemical properties could be attributed to the well-designed structure of the Co9S8/GNS nanocomposite which possesses large number of accessible active sites for lithium-ion insertion, fast ion diffusion rate and good electronic conductivity. (C) 2016 Elsevier B.V. All rights reserved.