Comparative investigation of phosphate-based composite cathode materials for lithium-ion batteries.
Comparative investigation of phosphate-based composite cathode materials for lithium-ion batteries.
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DOI：
10.1021/am502601r
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发表时间：
2014-08
影响因子：
9.5
通讯作者：
Jun‐chao Zheng;Ya-dong Han;Bao Zhang;Chao Shen;Lei Ming;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;Jia-feng Zhang
采用机械活化化学还原法合成了Li 3V 2（PO 4）3-LiVPO 4F、LiFePO 4-Li 3V 2（PO 4）3和LiFePO 4-Li 3V 2（PO 4）3-LiVPO 4F复合正极材料。X射线衍射（XRD）结果表明，所得产物为纯相，复合材料中各相的摩尔比与原料中的一致。透射电子显微镜（TEM）图像表明，各相共存的复合材料。LiFePO 4-Li 3V 2（PO 4）3-LiVPO 4F复合材料具有最佳的电化学性能。这些复合材料在0.1 C下的容量可达164 mAh g（-1），并且在0.5、1和5 C下具有良好的容量。其优异的电化学性能是由于它们之间的相互修饰和协同作用。
Li3V2(PO4)3-LiVPO4F, LiFePO4-Li3V2(PO4)3, and LiFePO4-Li3V2(PO4)3-LiVPO4F composite cathode materials are synthesized through mechanically activated chemical reduction followed by annealing. X-ray diffraction (XRD) results reveal that the obtained products are pure phase, and the molar ratio of each phase in the composites is consistent with that in raw material. Transmission electron microscopy (TEM) images show that each phase coexists in the composites. The LiFePO4-Li3V2(PO4)3-LiVPO4F composites exhibit the best electrochemical performance. These composites can deliver a capacity of 164 mAh g(-1) at 0.1 C and possess favorable capacities at rates of 0.5, 1, and 5 C. The excellent electrochemical performance is attributed to the mutual modification and the synergistic effects.