Citation: GAO Ping, TAN Zhuo, CHENG Fu-Quan, ZHOU Heng-Hui, TAN Song-Ting. Effect of Doping with Ti⁴⁺ Ion on the Electrochemical Performance of LiFe_0.6Mn_0.4PO₄/C[J]. Acta Physico-Chimica Sinica, ;2012, 28(02): 338-342. doi: 10.3866/PKU.WHXB201111242 shu

Effect of Doping with Ti⁴⁺ Ion on the Electrochemical Performance of LiFe_0.6Mn_0.4PO₄/C

GAO Ping ^1,2 ,
TAN Zhuo ^1,2 ,
CHENG Fu-Quan ² ,
ZHOU Heng-Hui ^2, ,
TAN Song-Ting ^1,

1.
1. College of Chemistry, Xiangtan University, Xiangtan 411105, Hunan Province, P. R. China;
2. College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P. R. China

Received Date: 13 September 2011
Available Online: 24 November 2011
Fund Project: 国家高技术研究发展计划项目(863) (2009AA035200)资助 (863) (2009AA035200)

Ti-doped LiFe_0.6Mn_0.4PO₄/C materials were synthesized by a solid-state method. The structures, morphologies, and electrochemical performance of the materials were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and galvanostatic charge-discharge experiments. The results indicate that Ti⁴⁺ doping does not change the structure of the materials, but remarkably improves their electrochemical performance. Li(Fe_0.6Mn_0.4)_0.96Ti_0.02PO₄/C shows excellent rate performance, with initial specific discharge capacities of 160.3 and 134.7 mAh·g^-1 at 0.1C and 10C rates. Even at the higher rate of 20C, it shows a discharge capacity of 124.4 mAh·g^-1. Electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV) analyses show that the resistance and the polarization of the LiFe_0.6Mn_0.4PO₄/C composite electrode could be effectively decreased by Ti⁴⁺ doping, which would account for the improved electrode performance.
- Lithium-ion battery,
- LiFe_1-xMn_xPO₄,
- Cathode material,
- Ion doping,
- Rate capacity
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Effect of Doping with Ti4+ Ion on the Electrochemical Performance of LiFe0.6Mn0.4PO4/C

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Effect of Doping with Ti⁴⁺ Ion on the Electrochemical Performance of LiFe_0.6Mn_0.4PO₄/C