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以三价铁制备LiFePO_4/C复合材料及其电化学性能 被引量:4

Preparation of LiFePO_4/C composite material using Fe(Ⅲ) and its electrochemical performance
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摘要 以Fe2O3、FePO4为铁源,分别采用蔗糖和活性铁粉为还原剂,设计了4条反应路线,利用热还原法制备了LiFePO4/C复合材料。用XRD和SEM对晶体结构及表面形貌进行了研究,用循环伏安法、充放电测试和交流阻抗法研究了电化学性能。制备的LiFePO4/C复合材料具有较好的电化学性能,以FePO4和活性铁粉为原料制得的复合材料性能最佳,以0.2C充放电,首次放电比容量为151 mAh/g,第200次循环的放电比容量仍能保持99.5%。 LiFePO4/C composite materials were prepared via a thermal reduction method. Fe2O3 and FePO4 were used as Fe sources; sucrose and active iron powder were used as reductive agent; four reaction routes were designed. The crystal structure and surface morphology were researched by XRD and SEM; the electrochemical performance was studied by cyclic voltammetry method, charge-discharge testing and AC impedance method. The prepared LiFePO4/C composite material had good electrochemical performance, the composite material synthesized using FePO4 and active iron powder presented the best performance. Its initial discharge specific capacity was 151 mAh/g and the capacity retention rate was 99.5% at the 200th cycle when charge-discharge at 0.2 C.
作者 王冠 江志裕
机构地区 复旦大学化学系
出处 《电池》 CAS CSCD 北大核心 2007年第3期195-198,共4页 Battery Bimonthly
基金 国家自然科学基金项目(20333040)
关键词 FE2O3 FEPO4 LIFEPO4 锂离子电池 Fe2O3 FePO4 LiFePO4 Li-ion battery
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参考文献9

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二级参考文献12

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