3D-hierarchical NiO-graphene nanosheet composites as anodes for lithium ion batteries with improved reversible capacity and cycle stability
3D-hierarchical NiO-graphene nanosheet composites as anodes for lithium ion batteries with improved reversible capacity and cycle stability
复制标题
3D分层NiO-石墨烯纳米片复合材料作为锂离子电池阳极，具有改进的可逆容量和循环稳定性
DOI：
10.1039/c2ra00963c
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发表时间：
2012-01-01
期刊：
影响因子：
3.9
通讯作者：
Qian, Xuefeng
中科院分区：
文献类型：
--
作者：
Tao, Liqi;Zai, Jiantao;Qian, Xuefeng
采用超声波法制备了NiO-石墨烯纳米片（GNS）复合材料，并通过X射线衍射、拉曼光谱、场发射扫描电子显微镜和透射电子显微镜对其进行了表征。结果表明，以纳米片为结构单元的三维分级NiO康乃馨均匀地锚定在GNS上，并作为间隔物减少GNS的堆叠。电化学性能表明，所获得的3D分级NiO-GNS复合材料具有显著高的可逆锂储存容量、良好的倍率性能和改善的循环稳定性，例如，即使在200 mA g（-1）的电流密度下50次循环后仍保持约1065 mA h g（-1）的可逆容量。复合材料电化学性能的显著提高归因于NiO在循环过程中的体积膨胀和收缩减小以及复合材料电导率的提高。
3D-hierarchical NiO-graphene nanosheet (GNS) composites as high performance anode materials for lithium-ion batteries (LIBs) were synthesized through a simple ultrasonic method, and characterized by X-ray diffraction, Raman spectrum, field emission scanning electron microscopy and transmission electron microscopy. The results show that the 3D-hierarchical NiO carnations with nanoplates as building blocks are homogeneously anchored onto GNS and act as spacers to reduce the stacking of GNS. Electrochemical performances reveal that the obtained 3D-hierarchical NiO-GNS composites exhibit remarkably high reversible lithium storage capacity, good rate capability and improved cycling stability, e.g. approximate 1065 mA h g(-1) of reversible capacity is retained even after 50 cycles at a current density of 200 mA g(-1). The remarkable improvement of electrochemical performances of the obtained composites could be attributed to the decrease of the volume expansion and contraction of NiO and the improvement of the electronic conductivity of composites during the cycling process.