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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Synthesis and electrochemical performance of spherical-like Li2FeSiO4/C/SP cathode material for lithium-ion batteries
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Synthesis and electrochemical performance of spherical-like Li2FeSiO4/C/SP cathode material for lithium-ion batteries

机译：锂离子电池球形Li2FeSiO4 / C / SP正极材料的合成及电化学性能

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摘要

The novel spherical Li2FeSiO4/C/SP is successfully synthesized by two-step precipitation method. The structure and morphology of the as-prepared samples are characterized by means of XRD, SEM, TEM and HRTEM. The results show that the product is consisted of spherical Li2FeSiO4 microparticles coated with carbon layer and dispersive nanoparticle which is conductive carbon black. The growth mechanism of the spherical Li2FeSiO4/C/SP composites is discussed in particularly. The electrochemical performance is demonstrated by the electrochemical impedance spectra and charge-discharge curves. The product presents excellent electrochemical performance. This is the result of the uniform spherical morphology improved lithium-ion diffusion rate (1.271 x 10 (12) cm(2) s (1)) by shortening diffusion pathways of lithium ion, and the carbon coating enhance the electronic conductivity. It is found that the spherical Li2FeSiO4/C/SP composites show a high capacity as 171.8 mA h g (1) at 0.1 C and high coulombic efficiency as 93.6%. The outstanding high-rate capability is also presented as 113.7 mA h g (1) at 5 C. Moreover, it exhibits very stable discharge specific capacity at different current densities from 0.2 to 5 C. These indicate that the spherical Li2FeSiO4/C/SP is a very promising candidate for cathode material in lithium-ion batteries. (C) 2015 Elsevier B. V. All rights reserved.
机译：通过两步沉淀法成功地合成了新型球形Li2FeSiO4 / C / SP。通过XRD，SEM，TEM和HRTEM表征所制备样品的结构和形态。结果表明，该产物由包覆有碳层的球形Li2FeSiO4微粒和导电纳米炭黑组成。特别讨论了球形Li2FeSiO4 / C / SP复合材料的生长机理。电化学性能由电化学阻抗谱和充放电曲线证明。该产品具有出色的电化学性能。这是通过缩短锂离子的扩散路径而提高了锂离子扩散速率的均匀球形形态（1.271 x 10（12）cm（2）s（1））的结果，碳涂层增强了电子导电性。发现球形Li2FeSiO4 / C / SP复合材料在0.1 C时显示出171.8 mA h g（1）的高容量，在库仑效率中显示出93.6％的高容量。杰出的高倍率性能在5 C时也显示为113.7 mA hg（1）。此外，它在0.2至5 C的不同电流密度下均表现出非常稳定的放电比容量。这表明球形Li2FeSiO4 / C / SP为锂离子电池正极材料的非常有希望的候选者。 （C）2015 Elsevier B. V.保留所有权利。

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