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Enhanced Electrochemical Performances of LiFePO4/C via V and F Co-doping for Lithium-Ion Batteries
Tao-tao Zhan,Chao Li,Yun-xia Jin,Shun-hua Xiao
Author NameAffiliationE-mail
Tao-tao Zhan   
Chao Li 
College of Chemistry and Bioengineering
, Guangxi Key Laboratory of Electrochemical and Magneto-chemical Functional Materials, Guilin University of Technology, Guilin 541006, China
 
 
Yun-xia Jin 
College of Chemistry and Bioengineering
, Guangxi Key Laboratory of Electrochemical and Magneto-chemical Functional Materials, Guilin University of Technology, Guilin 541006, China
 
 
Shun-hua Xiao 
College of Chemistry and Bioengineering
, Guangxi Key Laboratory of Electrochemical and Magneto-chemical Functional Materials, Guilin University of Technology, Guilin 541006, China
 
xiaoshunhua@glite.edu.cn 
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.
Key words:  LiFePO4/C  LiFe1-xVx(PO4)(3-y)/3Fy/C  Electrochemical performances  Di usion velocity
FundProject: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).
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
占涛涛,李超,靳云霞,肖顺华
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.
关键词:  LiFePO4/C  LiFe$1-xVx(PO4)(3-y)/3Fy/C  电化学性能  扩散速率
DOI:10.1063/1674-0068/29/cjcp1507163
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