Sol-Gel Synthesis and Electrochemical Performance of LiMnPO4/C Cathode Material

doi:10.3724/SP.J.1077.2013.12268

Abstract

Abstract:

LiMnPO₄/C composite as a cathode material for lithium ion batteries was synthesized via a Sol-Gel method using tributyl phosphate as both chelating agent and phosphor source while lauric acid as a carbon source. Crystalline structure and morphology of the composite were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM) and transmission electron microscopy (TEM). The results indicate that the LiMnPO₄/C composite is well crystallized as an olivine structure without any detectable impurity phase at annealing temperature of 700℃. The spherical-like LiMnPO₄/C microparticles are composed of large numbers of nanoparticles with the size ranging from 50 nm to 100 nm, which are covered with a thin carbon layer. Cyclic voltammetry and galvanostatic charge-discharge tests reveal that LiMnPO₄/C composite has superior electrochemical performance. The initial discharge capacities of LiMnPO₄/C are 141 and 113 mAh/g at rates of 0.05C and 0.5C under room temperature, respectively, along with high cyclic stability and good charge-discharge performances under high and low temperatures.

Key words: lithium ion batteries, LiMnPO₄, Sol-Gel method, tributyl phosphate, lauric acid

CLC Number:

TM912

WANG Yan-Ming, WANG Fei, WANG Guang-Jian. Sol-Gel Synthesis and Electrochemical Performance of LiMnPO₄/C Cathode Material[J]. Journal of Inorganic Materials, 2013, 28(4): 415-419.

Figures/Tables 6

Fig. 1 XRD pattern of the LiMnPO4/C composite

Fig. 2 SEM (a,b) and TEM (c,d) images of the LiMnPO4/C composite

Fig. 3 Cyclic voltammograms of the LiMnPO4/C composite at the first and second cycles

Fig. 4 The initial charge/discharge profiles of the LiMnPO4/C composite at 0.05C rate under different temperatures

Fig. 5 Cycling performances of the LiMnPO4/C composite at 0.05C rate under different temperatures

Fig. 6 The discharge profiles (a) and cycling performances (b) of the LiMnPO4/C composite at various rates under room temperature

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Sol-Gel Synthesis and Electrochemical Performance of LiMnPO₄/C Cathode Material

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