(1. 湘潭大学 化学学院 电化学能源储存与转换湖南省重点实验室，湘潭 411105；
2. 湘潭大学 化学学院 新能源装备及储能材料与器件国家国际科技合作基地，湘潭 411105)
摘 要: 采用溶胶-凝胶法合成锂离子电池正极材料Li2FeSiO4/C，研究煅烧温度对材料结构和电化学性能的影响。通过X射线衍射(XRD)、扫描电镜(SEM)、电化学阻抗测试(EIS)和充放电测试等方法对不同煅烧温度下合成的Li2FeSiO4/C材料的结构、表观形貌及电化学性能进行表征。结果表明：在650 ℃下合成的Li2FeSiO4/C具有良好的电化学性能，0.1C倍率下的首次放电比容量达到159.1 (mA？h)/g，50次循环后容量保持率高达92.1%。
关键字: Li2FeSiO4/C；正极材料；锂离子电池；溶胶-凝胶法
（1. Hunan Province Key Laboratory of Electrochemical Energy Storage and Conversion, School of Chemistry, Xiangtan University, Xiangtan 411105, China;
2. National Base for International Science and Technology Cooperation, School of Chemistry, Xiangtan University, Xiangtan 411105, China）
Abstract:The Li2FeSiO4/C composite cathode material was synthesized by sol-gel method, and the influences of sintering temperatures on the electrochemical properties of Li2FeSiO4/C were examined. The structure, morphology and electrochemical performance of Li2FeSiO4/C composites sintered at various temperatures were investigated by X-ray diffractometry (XRD), scanning electron microscopy (SEM), electrochemical impedance spectroscopy (EIS) and charge-discharge tests. The results reveal that the sample sintered at 650 ℃ can deliver the highest reversible capacity of 159.1 (mA？h)/g at rate of 0.1C, with excellent capacity retention of 92.1% after 50 cycles among all the samples.
Key words: Li2FeSiO4/C; cathode material; lithium-ion battery; sol-gel method
