One-pot synthesis of NiO/C composite nanoparticles as anode materials for lithium-ion batteries
One-pot synthesis of NiO/C composite nanoparticles as anode materials for lithium-ion batteries
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DOI：
10.1016/j.jallcom.2016.02.038
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发表时间：
2016-06
影响因子：
6.2
通讯作者：
Lipeng Zhang;Jiechen Mu;Zhao Wang;Guomin Li;Yanling Zhang;Yinghe He
中科院分区：
文献类型：
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作者：
Lipeng Zhang;Jiechen Mu;Zhao Wang;Guomin Li;Yanling Zhang;Yinghe He
采用一锅水热法制备了碳含量可控的纳米NiO/C复合锂离子电池负极材料。复合材料由非晶碳和纳米NiO组成。用X射线衍射（XRD）分析确定NiO晶体的结构，并从能量色散谱（EDS）结果计算碳含量。扫描电子显微镜（SEM）图像显示了纯NiO和NiO/C纳米颗粒的粒径分布相对较窄。电化学性能测量表明，在50次循环后，NiO/C纳米复合材料保持了585.9 mAh g−1的高可逆容量，远高于不含碳的纯NiO纳米颗粒的356.1 mAh g− 1。NiO/C纳米粒子还表现出显著的放电容量、高充放电速率和优异的循环稳定性。这些改进可以归因于NiO颗粒上均匀的碳涂层，这显著增强了电极的导电性并提高了电极的结构稳定性。
Nanostructured NiO/C composite particles with controlled carbon content for lithium-ion battery anode were prepared via a one-pot hydrothermal approach and subsequent calcination in a high purity nitrogen atmosphere. The composites were composed of amorphous carbon and nanocrystalline NiO. The structure of the NiO crystals was determined with X-ray diffraction (XRD) analysis and the content of carbon was calculated from the energy dispersive spectroscopy (EDS) results. Scanning electron microscopy (SEM) images showed a relatively narrow distribution of particle size for both the neat NiO and NiO/C nanoparticles. Electrochemical performance measurements demonstrated that, after 50 cycles, NiO/C nanocomposites maintained a high reversible capacity of 585.9 mAh g−1, much higher than that of 356.1 mAh g−1of the neat NiO nanoparticles without carbon. The NiO/C nanoparticles also exhibited a remarkable discharge capacity, a high charge/discharge rate and an excellent cycle stability. The improvements can be attributed to the even carbon coating on the NiO particles, which significantly enhances the conductivity and improves the structural stability of the electrode.