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Effects of Ta Ion Doping on Structure and Electrochemical Performances of Li_3V_2(PO_4)_3/C Cathode Materials

机译：钽离子掺杂对Li_3V_2（PO_4）_3 / C正极材料结构和电化学性能的影响

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摘要

Ta-doped Li_3V_2(PO_4)_3 cathode material coated by carbon was synthesized via a sol-gel method. Effects of Ta~(5+) doping on the physical structure and electrochemical performances of the Li_3V_2(PO_4)3/C cathode materials were investigated. Compared with the undoped sample, the Ta-doped samples had no excess peaks but the larger particle size and the narrower distribution of the particle size, indicating that Ta~(5+) entered into the structure of (Li_(1.5x)Ta_x)_3V_2(PO_4)_3/C rather than forming any impurities. When x was up to 0.01, the best electrochemical properties of the Ta-doped cathode materials had been displayed at the charge and discharge rate of 0.1 C with the voltage of 3.0 ～ 4.8V. The analysis of cyclic voltammetry revealed that the polarization of the Li_3V_2(PO_4)3/C cathode materials could be effectively decreased by Ta~(5+) doping(x=0.01), mainly resulting from the better electronic conductivity.
机译：通过溶胶-凝胶法合成了掺碳的钽掺杂Li_3V_2（PO_4）_3正极材料。研究了Ta〜（5+）掺杂对Li_3V_2（PO_4）3 / C正极材料物理结构和电化学性能的影响。与未掺杂样品相比，掺杂钽的样品没有多余的峰，但具有较大的粒径和较窄的粒径分布，表明Ta〜（5+）进入了（Li_（1.5x）Ta_x）结构。 _3V_2（PO_4）_3 / C而不是形成任何杂质。当x达到0.01时，在3.0〜4.8V的电压下，充放电速率为0.1 C时，钽掺杂的正极材料表现出最佳的电化学性能。循环伏安法分析表明，Li〜3V_2（PO_4）3 / C正极材料的极化可以通过Ta〜（5+）掺杂（x = 0.01）来有效降低，这主要是由于电子电导率更高。

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  • 来源
  • 会议地点 Shenzhen(CN)
  • 作者

    Lei Zhang; Tao Yang; Qian Yang; Zhaohui Huang; Minghao Fang; Yan-gai Liu;

  • 作者单位

    School of Materials Science and Technology, China University of Geosciences (Beijing), Beijing 100083, People's Republic of China;

    School of Materials Science and Technology, China University of Geosciences (Beijing), Beijing 100083, People's Republic of China;

    School of Materials Science and Technology, China University of Geosciences (Beijing), Beijing 100083, People's Republic of China;

    School of Materials Science and Technology, China University of Geosciences (Beijing), Beijing 100083, People's Republic of China;

    School of Materials Science and Technology, China University of Geosciences (Beijing), Beijing 100083, People's Republic of China;

    School of Materials Science and Technology, China University of Geosciences (Beijing), Beijing 100083, People's Republic of China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    lithium-ion battery; cathode material; Li_3V_2(PO_4)_3/C; doping;

    机译：锂离子电池;阴极材料； Li_3V_2（PO_4）_3 / C;掺杂;

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