Sodium Ion Insertion in Hollow Carbon Nanowires for Battery Applications
Sodium Ion Insertion in Hollow Carbon Nanowires for Battery Applications
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DOI：
10.1021/nl3016957
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发表时间：
2012-07-01
期刊：
影响因子：
10.8
通讯作者：
Liu, Jun
中科院分区：
文献类型：
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作者：
Cao, Yuliang;Xiao, Lifen;Liu, Jun
以中空聚苯胺纳米线为原料，通过热解法制备了中空碳纳米线。作为钠离子电池负极材料的HCNW具有251mAHg(-1)的高可逆容量，在恒流50 mAg(-1)(0.2C)下，在1.2~0.01V(vsNa‘/Na)的400次充放电循环中容量保持率为82.2%。在更高的充放电速率下，也观察到了良好的循环稳定性。在500rnAg(-1)(2C)的电流速率下，也可以获得149rnAhg(-1)的高可逆容量。较好的钠离子插入性能归因于碳纳米管扩散距离较短和石墨片之间较大的层间距(0.37 nm)，这与理论计算预测的允许钠离子在碳材料中插入的层间距相吻合。
Hollow carbon nanowires (HCNWs) were prepared through pyrolyzation of a hollow polyaniline nanowire precursor. The HCNWs used as anode material for Na-ion batteries deliver a high reversible capacity of 251 mAh g(-1) and 82.2% capacity retention over 400 charge-discharge cycles between 1.2 and 0.01 V (vs Na'/Na) at a constant current of 50 mA g(-1) (0.2 C). Excellent cycling stability is also observed at an even higher charge-discharge rate. A high reversible capacity of 149 rnAh g(-1) also can be obtained at a current rate of 500 rnA g(-1) (2C). The good Na-ion insertion property is attributed to the short diffusion distance in the HCNWIs and the large interlayer distance (0.37 nm) between the graphitic sheets, which agrees with the interlayered distance predicted by theoretical calculations to enable Na-ion insertion in carbon materials.