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20卷    第9期    总第138期    2010年9月

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文章编号:1004-0609(2010)09-1748-05
溶胶−凝胶法制备LiFePO4/C复合材料及其性能
尹雄鸽, 黄可龙, 刘素琴, 徐  洋

(中南大学 化学化工学院,长沙 410083)

摘 要: 为了提高LiFePO4的电化学性能,以柠檬酸为络合剂和碳源,采用溶胶−凝胶法制备LiFePO4/C复合正极材料。采用FTIR和XRD等对前驱体及产物进行表征,并测试样品的电化学性能。结果表明:经700 ℃烧结10 h所得产物具有单一的橄榄石型晶体结构,碳含量为10.81%(质量分数)。 样品在0.1C下首次放电比容量为127.1 mA∙h/g,在0.2C、0.5C、1C下首次放电比容量分别为106.1、83.3、70.6 mA∙h/g。 该样品在0.1C下经过20次循环后,容量还保持为126.3 mA∙h/g,衰减仅为0.035%。循环伏安和交流阻抗测试表明该材料具有较好的电化学性能。

 

关键词: 锂离子电池;正极材料;LiFePO4;溶胶−凝胶法

Synthesis of LiFePO4/C composite cathode materials by
 sol-gel method and its performance
YIN Xiong-ge, HUANG Ke-long, LIU Su-qin, XU Yang

School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China

Abstract:To improve the performance of LiFePO4, LiFePO4/C composite cathode materials were synthesized by sol-gel method using citric acid as chelant and carbon source. The precursors and the products were characterized by FTIR and XRD, and the electrochemical performance of the samples was measured. The results show that the composite synthesized at 700 ℃ has a simple pure olive-type phase with 10.81%(mass fraction) carbon content. The sample can deliver a discharge capacity of 127.1 mA∙h/g at 0.1C. The first special discharge capacities of LiFePO4 at 0.2C, 0.5C and 1C are 106.1, 83.3 and 70.6 mA∙h/g, respectively. It retains discharge capacity of 126.3 mA∙h/g  at 0.1C after 20 cycles, with only 0.035% capacity decrment.The sample exhibits good electrochemical performance, proved by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) tests.

 

Key words: Li ion battery; cathode material; LiFePO4; 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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