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Journal of Inorganic Materials

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2010 , Vol. 25 >Issue 3: 327 - 331

DOI: https://doi.org/10.3724/SP.J.1077.2009.09472

Research Letter

Effect of Heattreatment Temperature on the Electrochemical Performances of the Li2MnSiO4/C Composite Prepared through Polyol Process

  • LIU Wen-Gang ,
  • XU Yun-Hua ,
  • YANG Rong ,
  • HOJAMBERDIEV Mirabbos ,
  • ZHOU Zhi-Bin
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  • 1．School of Material Science and Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China；2.School of Science, Xi’an University of Technology, Xi’an 710048, China

Received date: 2009-07-08

  Revised date: 2009-10-26

  Online published: 2010-03-20

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Abstract

The Li2MnSiO4/C composite was synthesized through a polyol process following by heattreatment at intermediate temperatures. The precursors were precipitated from Si(OC2H5)4, LiAc·2H2O and Mn(Ac)2·4H2O in ethylene glycol by refluxing at 196℃ for 16h, the dried powders were milled, pressed and heat-treated at 500℃, 600℃ and 700℃ for 10h. The obtained samples were characterized by X-ray diffraction, automatic elemental analyzer, field emission scanning electron microscope (FESEM), energy dispersive spectroscope (EDS), and high resolution transmission electron microscope (HRTEM). As a result of the Rietveld refinement, two possible Li2MnSiO4 forms crystallizing in Pmn21 and P121/n1 space groups, respectively, are considered as the major phases, and Li2SiO3 is identified as the impurity phase. According to the FESEM observation, the mean particle size increases from 5-20nm to 20-40nm as the heattreatment temperature increasing from 500℃ to 700℃. Carbon is homogenously distributed on the prepared Li2MnSiO4/C composites. The HRTEM examination confirms that the Li2MnSiO4 particles are surrounded by a very thin amorphous carbon layer. The electrochemical experiments reveal that the Li2MnSiO4/C composite heat-treated at 600℃ for 10h has the higher electrochemical performance with an initial discharge capacity of 132.4mAh/g and a capacity retention ratio of 80% at the tenth cycle.

Key words： lithium manganese silicate; cathode material; polyol process; electrochemical performance

Cite this article

LIU Wen-Gang , XU Yun-Hua , YANG Rong , HOJAMBERDIEV Mirabbos , ZHOU Zhi-Bin . Effect of Heattreatment Temperature on the Electrochemical Performances of the Li2MnSiO4/C Composite Prepared through Polyol Process[J]. Journal of Inorganic Materials, 2010 , 25(3) : 327 -331 . DOI: 10.3724/SP.J.1077.2009.09472

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