Enhanced electrochemical performance of Na3V2(PO4)3 with Ni2+ doping by a spray drying-assisted process for sodium ion batteries
Enhanced electrochemical performance of Na3V2(PO4)3 with Ni2+ doping by a spray drying-assisted process for sodium ion batteries
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通过喷雾干燥辅助工艺增强 Ni2 掺杂 Na3V2(PO4)3 钠离子电池的电化学性能
DOI：
10.1016/j.ssi.2018.07.006
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发表时间：
2018-10-15
影响因子：
3.2
通讯作者：
Huang, Xiaobing
中科院分区：
文献类型：
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作者：
Zheng, Wei;Gao, Ruichuan;Huang, Xiaobing
采用喷雾干燥法制备了不同Ni 2+掺杂量（x = 0，0.05，0.1，0.15，0.2）的球形Na 3V 2-xNix（PO 4）（3）/C复合材料。XRD分析表明，少量Ni 2+掺杂不会改变Na 3V 2（PO 4）（3）/C的结构。扫描电镜（SEM）显示球形Na_3V_（2-x）Ni_x（PO_4）（3）/C材料的粒径为1-2 μ m。四点探针法和电化学阻抗谱（EIS）测试结果表明，Ni 2+掺杂的Na 3V 2（PO 4）（3）/C复合材料比未掺杂的Na 3V 2（PO 4）（3）/C复合材料具有更高的电子电导率和更小的电荷转移电阻，有利于电池性能的提高。特别是Na_3V_（1.85）Ni_（0.15）（PO_4）（3）/C，在5C高倍率下放电容量达到104.5mAh·g ~（-1）。此外，在5C下1000次循环后，保持了95.4%的优异容量保持率。
Spherical Na3V2-xNix(PO4)(3)/C composites with different Ni2+ doping contents (x = 0, 0.05, 0.1, 0.15, 0.2) were prepared through a spray drying-assisted method for sodium batteries. The XRD analysis indicates that a small amount of Ni2+ doping does not alter the structure of Na3V2(PO4)(3)/C. SEM demonstrates that the particle size of spherical Na3V2-xNix(PO4)(3)/C materials are 1-2 mu m. The four-point probe method and electrochemical impedance spectroscopy (EIS) show that the Ni2+ doped Na3V2(PO4)(3)/C samples possess higher electronic conductivity and smaller charge transfer resistance compared with the undoped Na3V2(PO4)(3)/C cathode composite, which is favorable for improving the cell performance. Especially for the Na3V1.85Ni0.15(PO4)(3)/C, it exhibited a superior discharge capacity of 104.5 mAh.g(-1) at a high rate of 5C. Moreover, after 1000 cycles at 5C, an excellent capacity retention of 95.4% is maintained.