首页> 外文会议>2013 International conference on materials for renewable energy amp; environment >The Effects of Carbon Nanotubes on the Electrochemical Performance of LiFePO4 Composite Cathode Materials for Li-ion Batteries
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The Effects of Carbon Nanotubes on the Electrochemical Performance of LiFePO4 Composite Cathode Materials for Li-ion Batteries

机译:碳纳米管对锂离子电池用LiFePO4复合正极材料电化学性能的影响

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The multi-walled carbon nanotubes (MWNTs) have been added into LiFePO4 as composite electrodes of lithium battery by ball milling.The charge-discharge capacity,cyclic voltammetry,cycle life,alternating current impedance and discharge temperatures characteristic are investigated.It’s found that adding carbon nanotubes is advantageous to enhance the electrochemical performance of the LiFePO4 electrodes as a whole.The composite electrode with 10% MWNTs adding quality exhibites a superior charge-discharge performance,and has initial charge capacities of 148 mAhg-1 and discharge capacities of 145 mAhg-1 respectively in the initial cycle at 0.1C chargedischarge rate.And the discharge capacity is 135 mAhg-1 at 0.5C rate and 124 mAhg-1 at 1.5C rate.The resistance values of LiFePO4/MWNTs composite electrode adding MWNTs quantity from 0% to 20% have a significant decrease when adding appropriate MWNTs.After 80 cycles,it has still 131mAh/g and the capacity holding is 90% after 80 cycles.The discharge capacity of composite electrode increases with increasing environment temperatures from 0 to 60℃,and maximal value is 153 mAhg-1 in the temperature of 60℃and has better performance of high temperature.
机译:通过球磨将多壁碳纳米管(MWNTs)添加到LiFePO4中作为锂电池的复合电极。研究了其充放电容量,循环伏安,循环寿命,交流阻抗和放电温度特性。碳纳米管有利于整体上增强LiFePO4电极的电化学性能。MWNTs添加质量为10%的复合电极具有优异的充放电性能,初始充电容量为148 mAhg-1,放电容量为145 mAhg。初始循环中以0.1C的充电速率分别为-1、0.5C的放电容量为135 mAhg-1、1.5C的放电容量为124 mAhg-1.LiFePO4 / MWNTs复合电极的电阻值从0开始增加了MWNTs当添加适当的MWNT时,百分比从20%显着降低。80个循环后,它仍为131mAh / g,80个循环后容量保持率为90%。复合电极的容量随着环境温度从0升高到60℃而增加,在60℃时最大值为153 mAhg-1,具有更好的高温性能。

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