Pacific Northwest National Laboratory, 902 Battelle Boulevard P.O. Box 999, Richland, Washington 99352, United States.
Nano Lett. 2012 Jul 11;12(7):3783-7. doi: 10.1021/nl3016957. Epub 2012 Jun 13.
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 mAh g(-1) also can be obtained at a current rate of 500 mA g(-1) (2C). The good Na-ion insertion property is attributed to the short diffusion distance in the HCNWs 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.
通过热解中空聚苯胺纳米线前驱体制备了中空碳纳米线（HCNWs）。用作钠离子电池阳极材料的 HCNWs 在 50 mA g(-1)（0.2 C）的恒电流下，在 1.2 至 0.01 V（相对于 Na(+)/Na）的电位范围内，经过 400 次充放电循环，具有 251 mAh g(-1) 的高可逆容量和 82.2%的容量保持率。在更高的充放电速率下，也观察到了优异的循环稳定性。在 500 mA g(-1)（2 C）的电流速率下，也可以获得 149 mAh g(-1) 的高可逆容量。良好的钠离子嵌入性能归因于 HCNWs 中的短扩散距离和石墨片之间的大层间距离（0.37 nm），这与理论计算预测的层间距离一致，能够使钠离子嵌入碳材料中。
