Synthesis and Electrochemical Properties of Li0.97+δTi0.03Fe0.97Mn0.03 PO4/C Composite Cathode Material

doi:10.3724/SP.J.1077.2008.00295

Abstract

Abstract: The composite cathode material of Li_0.97+δTi_0.03Fe_0.97Mn_0.03 PO₄/C was synthesized by carbothermal reduction of FeFe_0.97Mn_0.03 PO₄ which was prepared by co-precipitation method. The samples were characterized by X-ray diffraction, scanning electron microscope, FTIR absorption spectra, and their electrochemical performances were investigated in terms of rate discharge and cycling behavior. The results show that Li_0.97+δTi_0.03Fe_0.97Mn_0.03 samples are simple pure olive-type phase, and the particles are homogeneous with average particle size of about 1μm. The ion dopants of Mn⁴⁺ and Ti⁴⁺ do not affect the structure of the material. Compared with LiFePO₄/C, the composite compound Li_0.97+δTi_0.03Fe_0.97Mn_0.03 exhibits good electrode properties with discharge capacities of 134.0, 133.4, 130.1 and 127.2mAh·^g-1 at 0.2, 1, 5 and 10C rates, respectively. In addition, it shows excellent cycle stability at different rates.

Key words: lithium-ion battery, LiFePO₄, ion dopants

CLC Number:

TM912

TANG Zhi-Yuan,GAO Fei,XUE Jian-Jun. Synthesis and Electrochemical Properties of Li_0.97+δTi_0.03Fe_0.97Mn_0.03 PO₄/C Composite Cathode Material[J]. Journal of Inorganic Materials, DOI: 10.3724/SP.J.1077.2008.00295.

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Synthesis and Electrochemical Properties of Li_0.97+δTi_0.03Fe_0.97Mn_0.03 PO₄/C Composite Cathode Material

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