钛离子掺杂对LiFe0.6Mn0.4PO4/C 电化学性能的影响

doi:10.3866/PKU.WHXB201111242

Abstract

Abstract: 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.

Key words: Lithium-ion battery, LiFe_1-xMn_xPO₄, Cathode material, Ion doping, Rate capacity

MSC2000:

O646

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 Phys. -Chim. Sin., 2012, 28(02): 338-342.

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

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