Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第27卷    第2期    总第215期    2017年2月

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文章编号:1004-0609(2017)-02-0289-06
煅烧温度对溶胶-凝胶法制备的Li2FeSiO4/C正极材料性能的影响
义丽玲1, 2,王先友1, 2,白艳松1, 2,王 钢1, 2,刘梅红1, 2

(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

Influences of sintering temperature on performances of Li2FeSiO4/C cathode material synthesized by sol-gel method
YI Li-ling1, 2, WANG Xian-you1, 2, BAI Yan-song1, 2, WANG Gang1, 2, LIU Mei-hong1, 2

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

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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