| 锂离子电池正极材料Li1-xVxFePO4/C的制备及电化学性能 |
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| 引用本文： | 宋士涛,吴素霞,王东军,邓小川.锂离子电池正极材料Li1-xVxFePO4/C的制备及电化学性能[J].河北科技师范学院学报,2009,23(2):27-33. |
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| 作者姓名： | 宋士涛 吴素霞 王东军 邓小川 |
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| 作者单位： | 1. 河北科技师范学院,化学系,河北,秦皇岛,066600
2. 中国科学院,青海盐湖研究所 |
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| 基金项目： | 国家"十五"重点科技攻关计划滚动项目课题，青海省重点科技攻关项目 |
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| 摘 要： | 采用高温固相法合成了Li1-xVxFePO4/C（x=0,0.01,0.02,0.03,0.04,0.05,0.10）锂离子电池正极材料,通过XRD,SEM,CV,EIS和恒流充放实验研究了不同掺杂量对产物结构和电化学性能的影响。结果表明,少量V的掺杂未影响到LiFePO4的晶体结构,但显著改善了其电化学性能。其中,Li0.98V0.02FePO4/C材料以0.1 C倍率放电时,首次放电容量达到160.9 mAh·g^-1,且循环性能良好。
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| 关 键 词： | 磷酸铁锂 正极材料 离子掺杂 电化学性能 |
Preparation of Li1-xVxFePO4/C and Study on Its Electrochemical Performances |
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| SONG Shi-tao,WU Su-xia,WANG Dong-jun,DENG Xiao-chuan.Preparation of Li1-xVxFePO4/C and Study on Its Electrochemical Performances[J].Journal of Hebei Normal University of Science & Technology,2009,23(2):27-33. |
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| Authors: | SONG Shi-tao WU Su-xia WANG Dong-jun DENG Xiao-chuan |
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| Institution: | SONG Shi-tao ,WU Su-xia ,WANG Dong-jun ,DENG Xiao-chuan (1 Dept of Chemistry, Hebei Normal University of Science ＆ Technology,Qinhuangdao Hebei,066600; 2 Qinghai Institute of Salt Lake, Chinese Academy of Science; China) |
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| Abstract: | Composites Li1-x Vx FePO4/C（x = 0. 00,0. 01,0. 02,0. 03,0. 05,0. 10） were synthesized by high temperature solid state reaction method. The samples were characterized by X-ray diffraction （XRD） and scanning electron microscope（SEM）. Their electrochemical performances were investigated by the analyses of cyclic voltammetry（CV）, electrochemical impedance spectra（EIS） and constant current charge-discharge experiment. The results indicated that the low concentration V dopant did not affect the structure of LiFePO4 but considerably improved its electrochemical performances. The Li0.98 V0.02 FePO4/C materials showed better electrochemical performances than LiFePO4. at 0.1 C discharging rate, and it was capable of delivering reversible specific capacity of 160.9 mAh · g^-1, with fairly stable cycleability. |
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| Keywords: | lithium iron phosphate cathode material ion doping electrochemical performances |
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