引用本文:
庄大高, 赵新兵, 谢健, 涂健, 朱铁军, 曹高劭. Nb 掺杂LiFePO4/C 的一步固相合成及电化学性能[J]. 物理化学学报,
2006, 22(07): 840-844.
doi:
10.1016/S1872-1508(06)60037-5
Citation: ZHUANG Da-Gao, ZHAO Xin-Bing, XIE Jian, TU Jian, ZHU Tie-Jun, CAO Gao-Shao. One-step Solid-state Synthesis and Electrochemical Performance of Nb-doped LiFePO4/C[J]. Acta Physico-Chimica Sinica, 2006, 22(07): 840-844. doi: 10.1016/S1872-1508(06)60037-5
Citation: ZHUANG Da-Gao, ZHAO Xin-Bing, XIE Jian, TU Jian, ZHU Tie-Jun, CAO Gao-Shao. One-step Solid-state Synthesis and Electrochemical Performance of Nb-doped LiFePO4/C[J]. Acta Physico-Chimica Sinica, 2006, 22(07): 840-844. doi: 10.1016/S1872-1508(06)60037-5
Nb 掺杂LiFePO4/C 的一步固相合成及电化学性能
摘要:
用固相法一步合成了Nb掺杂的LiFePO4/C复合材料, 研究了Nb掺杂量对材料电化学性能的影响. 结果表明, Nb掺杂后LiFePO4/C复合材料的电化学性能明显提高. 在0.5C、1C和2C充放电倍率下, 名义成分为Li0.96Nb0.008FePO4/C正极材料的比容量分别为161、148和132 mAh•g−1, 已达到实用化水平. 阻抗谱和循环伏安特性测试显示, Nb掺杂有效地降低了复合材料电极的阻抗和极化, 说明Nb掺杂的主要作用是提高了LiFePO4的电子电导率.
English
One-step Solid-state Synthesis and Electrochemical Performance of Nb-doped LiFePO4/C
Abstract:
Nb-doped LiFePO4/C was synthesized using one-step solid-state method. The effect of Nb contents on the electrochemical performance was investigated. The results showed that the electrochemical performances were remarkably promoted. The discharge capacities of Li0.96Nb0.008FePO4/C cathode material were 161, 148, and 132 mAh•g−1 at the charge and discharge rates of 0.5C, 1C, and 2C, respectively. The results of cyclic voltammetry and EIS analyses showed that the resistance and polarization of the LiFePO4/C composite electrode could be effectively decreased by Nb doping, which would improve the electron conductivity of LiFePO4.
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