| MoO42-取代对Nasicon型Li3Fe2(PO4)3正极材料电化学性能的影响 |
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| 引用本文： | 张勃,何珺,华正伸,鲁豪祺,王新,彭会芬.MoO42-取代对Nasicon型Li3Fe2(PO4)3正极材料电化学性能的影响[J].无机化学学报,2013,29(18). |
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| 作者姓名： | 张勃 何珺 华正伸 鲁豪祺 王新 彭会芬 |
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| 作者单位： | 河北工业大学, 材料科学与工程学院, 天津 300130,河北工业大学, 材料科学与工程学院, 天津 300130,河北工业大学, 材料科学与工程学院, 天津 300130,河北工业大学, 材料科学与工程学院, 天津 300130,河北工业大学, 材料科学与工程学院, 天津 300130,河北工业大学, 材料科学与工程学院, 天津 300130;天津市材料层状复合与界面控制技术重点实验室, 天津 300130 |
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| 基金项目： | 河北省自然科学基金（No.E2016202358）资助项目。 |
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| 摘 要： | 以MoO42-部分取代Li3Fe2（PO4）3中的PO43-，研究表明：加入的MoO42-离子主要以固溶形式存在于Li3Fe2（PO4）3中，起到了显著改善其电化学性能的作用。其中，MoO42-掺杂浓度为0.3的样品表现出最佳的电化学性能，其在0.5C倍率下的首次放电容量为113.7 mAh·g-1，这一数值比未掺杂的提高了20.7%；经过60次循环充放电，容量保持率为94%。将放电倍率从0.5C逐步增大至5C，再降至初始的0.5C，并在每个倍率循环10次，这一材料的最终放电容量可达首次0.5C的95%。这些优异的性能应归因于MoO42-掺杂使材料的氧化还原能力增强，氧化还原电对的电势差减小，电池内部的电荷转移电阻减小，以及Li+扩散系数增加。
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| 关 键 词： | 正极材料 锂电池 混合阴离子效应 阴离子掺杂 电化学性能 |
| 收稿时间： | 2016/5/19 0:00:00 |
| 修稿时间： | 2016/9/19 0:00:00 |
Effect of MoO42- Substitution on Electrochemical Properties of Nasicon Li3Fe2(PO4)3 Cathode |
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| ZHANG Bo,HE Jun,HUA Zheng-Shen,LU Haoqi,WANG Xin and PENG Hui-Fen.Effect of MoO42- Substitution on Electrochemical Properties of Nasicon Li3Fe2(PO4)3 Cathode[J].Chinese Journal of Inorganic Chemistry,2013,29(18). |
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| Authors: | ZHANG Bo HE Jun HUA Zheng-Shen LU Haoqi WANG Xin and PENG Hui-Fen |
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| Institution: | School of Material Science & Engineering, Hebei University of Technology, Tianjin 300130, China,School of Material Science & Engineering, Hebei University of Technology, Tianjin 300130, China,School of Material Science & Engineering, Hebei University of Technology, Tianjin 300130, China,School of Material Science & Engineering, Hebei University of Technology, Tianjin 300130, China,School of Material Science & Engineering, Hebei University of Technology, Tianjin 300130, China and School of Material Science & Engineering, Hebei University of Technology, Tianjin 300130, China;Tianjin Key Laboratory of Laminating Fabrication & Interface Control Technology for Advanced Materials, Tianjin 300130, China |
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| Abstract: | MoO42-polyanion was tried to substitute for PO43-partially in the Li3Fe2(PO4)3 compound. The results proved that the introduced MoO42- anions mainly dissolved in the Li3Fe2(PO4)3 and the corresponding electrochemical properties were improved apparently. Among the MoO42-substituted materials, the sample with MoO42-content of 0.3 presented the excellent electrochemical properties. Its initial discharging capacity was 113.7 mAh·g-1 at a rate of 0.5C, which was about 20.7% higher than that without any MoO42-. The capacity retention was about 94% at a rate of 0.5C after 60 cycles. Moreover, this material could restore 95% of the initial capacity when the discharging rate was reset back to 0.5C even after higher cycling rate of 5C. The boost in electrochemical properties for the MoO42-substituted samples is ascribed to the synergistic effects of improved redox ability, decreased potential polarization and charge transfer resistance as well as increased diffusion coefficient of lithium ions. |
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| Keywords: | cathode lithium battery mixed anion effect anion substitution electrochemical properties |
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