| 通过掺杂V和F提高碳包覆的磷酸铁锂锂离子电池的电化学性能 |
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| 引用本文： | 占涛涛,李超,靳云霞,肖顺华.通过掺杂V和F提高碳包覆的磷酸铁锂锂离子电池的电化学性能[J].化学物理学报,2016,29(3):303-307. |
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| 作者姓名： | 占涛涛 李超 靳云霞 肖顺华 |
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| 作者单位： | 桂林理工大学化学与生物工程学院, 广西电磁化学功能材料重点实验室, 桂林 541006,桂林理工大学化学与生物工程学院, 广西电磁化学功能材料重点实验室, 桂林 541006,桂林理工大学化学与生物工程学院, 广西电磁化学功能材料重点实验室, 桂林 541006,桂林理工大学化学与生物工程学院, 广西电磁化学功能材料重点实验室, 桂林 541006 |
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| 基金项目： | This work was supported by the National Natural Science Foundation of China (No.51364008), the Science and Technology Research Projects of Guangxi institution of higher education (No.2013ZD030), and the Guangxi Natural Science Foundation (No.2014GXNSFAA118046). |
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| 摘 要： | 在原位聚合合成方法的基础上,结合两步烧结过程制得LiFe1-xVx(PO4)(3-y)/3Fy/C.V和F掺杂对碳包覆的磷酸铁锂材料的结构、形貌和电化学性能有影响.通过XRD、FTIR、SEM、充/放电测试和电化学阻抗谱对材料的结构、形貌和电化学性能进行了表征.结果表明,V和F的掺杂并没有破坏橄榄石结构中的LiFePO4/C,但可以提高晶体结构的稳定,降低电荷的转移阻抗,提高锂离子扩散速度,改善了LiFePO4/C材料的循环性能和高倍率性能.
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| 关 键 词： | LiFePO4/C LiFe$1-xVx(PO4)(3-y)/3Fy/C 电化学性能 扩散速率 |
| 收稿时间： | 2015/7/24 0:00:00 |
| 修稿时间： | 2015/11/10 0:00:00 |
Enhanced Electrochemical Performances of LiFePO4/C via V and F Co-doping for Lithium-Ion Batteries |
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| Tao-tao Zhan,Chao Li,Yun-xia Jin and Shun-hua Xiao.Enhanced Electrochemical Performances of LiFePO4/C via V and F Co-doping for Lithium-Ion Batteries[J].Chinese Journal of Chemical Physics,2016,29(3):303-307. |
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| Authors: | Tao-tao Zhan Chao Li Yun-xia Jin and Shun-hua Xiao |
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| Institution: | College of Chemistry and Bioengineering, Guangxi Key Laboratory of Electrochemical and Magneto-chemical Functional Materials, Guilin University of Technology, Guilin 541006, China,College of Chemistry and Bioengineering, Guangxi Key Laboratory of Electrochemical and Magneto-chemical Functional Materials, Guilin University of Technology, Guilin 541006, China,College of Chemistry and Bioengineering, Guangxi Key Laboratory of Electrochemical and Magneto-chemical Functional Materials, Guilin University of Technology, Guilin 541006, China and College of Chemistry and Bioengineering, Guangxi Key Laboratory of Electrochemical and Magneto-chemical Functional Materials, Guilin University of Technology, Guilin 541006, China |
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| Abstract: | Based on the method of in situ polymerization synthesis combined with two-step sinter-ing process, LiFe1-xVx(PO4)(3-y)/3Fy/C was prepared. The e ects of V and F co-doping on the structure, morphology, and electrochemical performances of LiFePO4/C were in-vestigated by X-ray di raction, Fourier transform infrared spectra, scanning electron mi-croscope, charge/discharge tests, and electrochemical impedance spectroscopy, respectively. The results indicated that the V and F co-doping did not destroy the olivine structure of LiFePO4/C, but it can stabilize the crystal structure, decrease charge transfer resistance, enhance Li ion di usion velocity, further improve its cycling and high-rate capabilities of LiFePO4/C. |
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| Keywords: | LiFePO4/C LiFe1-xVx(PO4)(3-y)/3Fy/C Electrochemical performances Di usion velocity |
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