纺锤体形LiFePO4锂离子电池正极材料的制备与性能

doi:10.3866/PKU.WHXB20110241

Abstract

Abstract:

We synthesized LiFePO₄ directly by a solvothermal method at low temperature and then a heat treatment was carried out to give a LiFePO₄/C composite for using as a cathode in lithium ion battery. The crystal structure and the charge-discharge performance of the prepared samples were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, and galvanostatic charge-discharge testing. The results indicated that the LiFePO₄ synthesized at low-temperature (120 °C) with glycerol as a solvent had a single olivine-type crystal structure and a spindle-shaped morphology with a very narrow size distribution. After heat treatment, a LiFePO₄/C composite with excellent charge-discharge performance was obtained and the spindle morphology of the sample was intact. Galvanostatic charge-discharge tests showed that the prepared LiFePO₄/C cathode had an initial discharge specific capacity of 147.2 mAh·g^-1 at 0.1C at room temperature and it was 136.3 mAh·g^-1 after 50 cycles. The average discharge specific capacities of LiFePO₄/C at 0.2C, 0.5C, and 1C were about 130, 120, and 108 mAh·g^-1, respectively.

Key words: Lithium ion battery, LiFePO₄, Spindle-shaped, Solvothermal method, Charge-discharge performance

MSC2000:

O646

SU Chang, LU Guo-Qiang, XU Li-Huan, ZHANG Cheng, MA Chun-An. Synthesis and Properties of Spindle-Shaped LiFePO₄ for the Cathode Material of Lithium Ion Battery[J].Acta Phys. -Chim. Sin., 2011, 27(03): 609-614.

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Synthesis and Properties of Spindle-Shaped LiFePO₄ for the Cathode Material of Lithium Ion Battery

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Synthesis and Properties of Spindle-Shaped LiFePO₄ for the Cathode Material of Lithium Ion Battery