| Cu2+掺杂高密度LiFePO4/C正极材料的合成及性能 |
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| 引用本文： | 常照荣,吕豪杰,汤宏伟,付小宁,李华吉. Cu2+掺杂高密度LiFePO4/C正极材料的合成及性能[J]. 功能材料, 2009, 40(10) |
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| 作者姓名： | 常照荣 吕豪杰 汤宏伟 付小宁 李华吉 |
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| 作者单位： | 1. 河南师范大学,化学与环境科学学院,河南,新乡,453007
2. 新乡学院,化学与环境工程学院,河南,新乡,453007 |
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| 基金项目： | 国家自然科学基金资助项目(20671031) |
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| 摘 要： | 以高密度FePO4作为前躯体,Cu(Ac)2为掺杂源,通过高温固相法合成了高振实密度的锂离子电池正极材料LiFe1-xCuxPO4/C(x=0、0.01、0.015、0.02、0.025).采用X粉末衍射(XRD)、电子扫描显微镜(SEM)、循环伏安法(C-V)和恒电流充放电对合成的材料掺杂进行了结构、形貌和电性能表征和分析研究.结果表明, 所合成的掺杂复合材料LiFe1-xCuxPO4/C为典型的橄榄石型结构,结晶度高,具有较高的振实密度.掺杂Cu2+离子在很大程度上可以提高LiFePO4的电化学性能,当Cu含量为2.0%(质量分数)时,LiFe0.98Cu0.02PO4/C的振实密度可以达到1.98g/cm3,比容量为最大值,0.1C倍率放电可达150.0mAh/g,体积比容量为297.0mAh/cm3;2C倍率放电比容量仍可以达到127.3mAh/g以上,体积比容量为252.1mAh/cm3.
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| 关 键 词： | 正极材料 锂离子电池 LiFe1-xCuxPO4 离子掺杂 电化学性能 |
Synthesis and performance of high tap density LiFePO_4 cathode materials doped with copper ions |
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| CHANG Zhao-rong,LV Hao-jie,TANG Hong-wei,FU Xiao-ning,LI Hua-ji. Synthesis and performance of high tap density LiFePO_4 cathode materials doped with copper ions[J]. Journal of Functional Materials, 2009, 40(10) |
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| Authors: | CHANG Zhao-rong LV Hao-jie TANG Hong-wei FU Xiao-ning LI Hua-ji |
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| Affiliation: | CHANG Zhao-rong1,LV Hao-jie1,TANG Hong-wei1,FU Xiao-ning2,LI Hua-ji1(1.College of Chemistry and Environmental Science,Henan Normal University,Xinxiang 453007,China,2.College of Chemistry and Environmental Engineering,Xinxiang College,China) |
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| Abstract: | Stoichiometric Cu-doped lithium iron phosphate LiFe1-xCuxPO4/C(x=0,0.01,0.015,0.02,0.025)cathode material was synthesized by a solidstate reaction in an inert atmosphere which used Cu(Ac)2 as dopant.The LiFePO4 samples were characterized by X-ray difraction,scanning electron microscope and electrochemicaI performance testing.The results indicate that the cathode material is well crystallized,homogeneous olivine-type phase.The ion dopants do not affect the structure of the material but considerably improve i... |
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| Keywords: | cathode materials lithium iron battery LiFe1-xCuxPO4 ion doping electrochemical performance |
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