| 分步碳包覆合成高密度LiFePO4/C复合材料 |
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| 引用本文： | 胡国荣,刘见华,曹雁冰,彭忠东,杜柯.分步碳包覆合成高密度LiFePO4/C复合材料[J].中国有色金属学报,2012,22(4):1195-1200. |
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| 作者姓名： | 胡国荣 刘见华 曹雁冰 彭忠东 杜柯 |
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| 作者单位： | 中南大学冶金科学与工程学院,长沙,410083 |
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| 基金项目： | “十一五”国家科技支撑计划资助项目，湖南省科技计划项目，中央高校基本科研业务费专项资金资助项目 |
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| 摘 要： | 采用分步碳包覆法合成LiFePO4/C复合材料。首先,将原料Fe2O3、NH4H2PO4和葡萄糖经过固相反应合成Fe2P2O7/C复合材料,再将Fe2P2O7/C与前驱体Li2CO3、葡萄糖混合,通过二次碳包覆工艺合成LiFePO4/C复合材料,并考察合成温度对LiFePO4/C复合材料电化学性能的影响。采用X射线衍射、扫描电镜、差热-热重分析、电化学阻抗谱(EIS)和充放电测试对材料的性能进行表征。结果表明:以制取的Fe2P2O7/C为前驱体合成的LiFePO4/C复合材料具有较好的物理和电化学性能,材料的振实密度达1.26 g/m3,0.1C放电容量为158.3 mA.h/g,1C初次放电比容量达到140 mA.h/g。
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| 关 键 词： | LiFePO4/C复合材料 Fe2P2O7 锂离子电池 正极材料 |
Synthesis of high density LiFePO4/C composite by stepwise carbon-coating |
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| HU Guo-rong
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LIU Jian-hua
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CAO Yan-bing
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PENG Zhong-dong
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DU Ke.Synthesis of high density LiFePO4/C composite by stepwise carbon-coating[J].The Chinese Journal of Nonferrous Metals,2012,22(4):1195-1200. |
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| Authors: | HU Guo-rong LIU Jian-hua CAO Yan-bing PENG Zhong-dong DU Ke |
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| Affiliation: | (School of Metallurgy Science and Engineering,Central South University,Changsha 410083,China) |
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| Abstract: | LiFePO4/C composite was synthesized by stepwise carbon-coating.First,the precursor Fe2P2O7/C was obtained by solid state reaction with Fe2O3,NH4H2PO4 and glucose,then,LiFePO4/C was synthesized by mixing the precursor,Li2CO3 and glucose through stepwise carbon-coating process.The effect of synthesis temperature on the electrochemical performances of LiFePO4/C composites was studied.The product were characterized by XRD,SEM,DSC-TGA,EIS and charge-discharge test.The results show that the LiFePO4/C composites synthesized with Fe2P2O7 as the precursor have excellent physics and electrochemical performance,the tap density of product reaches 1.26 g/cm3,and it has discharge capacities of 158.3 mA·h/g at 0.1C and 140 mA·h/g at 1C. |
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| Keywords: | LiFePO4/C composites Fe2P2O7 lithium ion batteries cathode materials |
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