聚苯胺在LiFePO4/C正极中的导电和贮锂功能
首发时间:2010-02-10
摘要:测试结果表明聚苯胺的导电率σPAn=18.39 S•cm-1,大于锂离子电池常用正极导电剂乙炔黑的导电率σAB=7.77 S•cm-1。以聚苯胺作为正极活性材料,不添加其他导电剂,对其进行恒电流充、放电试验(电流密度I=15 mA/g)时,其第三循环的比放电容量D3=60.8 mAh/g、充、放电效率η3=94.56%,试验结果表明:聚苯胺在正极中具有贮锂功能。以LiFePO4/C含碳复合材料作为正极活性材料,以聚苯胺替代乙炔黑作为导电剂进行了恒电流充、放电试验,在电流密度为15 mA/g、30 mA/g、45 mA/g、60 mA/g、75 mA/g、90 mA/g和120 mA/g时的比充、放电容量都增加了,表明正极的极化程度减小了。正极在经过较大电流密度(120 mA/g)充、放电后,再以小电流密度(15 mA/g)进行充、放电时,比充、放电容量几乎没有变化,表明经大电流(120 mA/g)充、放电后LiFePO4/C的贮锂结构没有变化。
关键词: LIB 复合正极活性材料:LiFePO4/C 聚苯胺的导电和贮锂功能 导电剂对充、放电性能的影响
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The Conductive and Storing Lithium Ions Functions of Polyaniline in the Positive Electrode of LiFePO4/C
Abstract:The experimental results show that the conductivity of polyaniline (σ=18.39 S•cm-1) is greater than that of acetylene black (σ=7.77 S•cm-1) which is used as conductive reagent in the positive electrode of lithium ion batteries. The galvanostatic experiment (current density I=15 mA/g) of the above polyaniline was carried on, and no other conductive reagent was used. In the third cycle the specific discharge capacity D3 was 60.8 mAh/g and the charge and discharge efficiency η3 was 94.56%. The experimental results show that polyaniline in the positive electrodes has the storing lithium ion function. The galvanostatic experiments were carried on with the LiFePO4/C as the positive electrode active materials and polyaniline was used as the conductive reagent to take place of acetylene black. When the current density were 15 mA/g, 30 mA/g, 45 mA/g, 60 mA/g, 75 mA/g, 90 mA/g and 120 mA/g, all the specific charge and discharge capacities increased. After charging and discharging with large current density (120 mA/g), the positive electrode charged and discharged with the original little current density (15 mA/g). The specific charge and discharge capacities were almost unchanged. It showed that the storing lithium ions structure of LiFePO4/C did not change.
Keywords: LIB composite positive electrode active materials:LiFePO4/C the conductive and storing lithium ions functions of polyaniline the influences of conductive reagents on the charge and discharge performance
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No.4014451469812657****
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