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

doi:10.3724/SP.J.1077.2009.09472

Abstract

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

CLC Number:

TM912

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, DOI: 10.3724/SP.J.1077.2009.09472.

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

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