Electrochemical properties of VPO4/C nanosheets and microspheres as anode materials for lithium-ion batteries.
Electrochemical properties of VPO4/C nanosheets and microspheres as anode materials for lithium-ion batteries.
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DOI：
10.1021/am5016638
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发表时间：
2014-04
影响因子：
9.5
通讯作者：
Jun‐chao Zheng;Ya-dong Han;Bao Zhang;Chao Shen;Lei Ming;Xing Ou;Jia-feng Zhang
中科院分区：
文献类型：
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作者：
Jun‐chao Zheng;Ya-dong Han;Bao Zhang;Chao Shen;Lei Ming;Xing Ou;Jia-feng Zhang
采用水热法和煅烧法成功地合成了VPO 4/C纳米片和微球。XRD结果表明，所得产物均为正交晶系的VPO 4相。SEM和TEM图像表明，通过控制合成条件可以获得纳米片和球形形貌。两种样品均被无定形碳均匀包覆。电化学测试结果表明，纳米片结构的样品比微球结构的样品具有更好的电化学性能。VPO_4/C纳米片在0.05 C下的初始放电容量为788.7 mAh g（-1），在1、2和4 C下的放电容量均较好。纳米片结构能有效提高VPO 4/C负极材料的电化学性能。
VPO4/C nanosheets and microspheres are successfully synthesized via a hydrothermal method followed by calcinations. The XRD results reveal that the obtained products both have an orthorhombic VPO4 phase. The SEM and TEM images demonstrate that nanosheets and spherical morphology can be obtained by controlling the synthesis conditions. The samples are both uniformly coated by amorphous carbon. The electrochemical test results show that the sample with a nanosheet structure has a better electrochemical performance than the microsphere samples. The VPO4/C nanosheets can deliver an initial discharge capacity of 788.7 mAh g(-1) at 0.05 C and possessed a favorable capacity at the rates of 1, 2, and 4 C. The nanosheet structure can effectively improve the electrochemical performances of VPO4/C anode materials.