摘要
使用稳定锂金属粉末(SLMP)/多壁碳纳米管(MWCNTs)作为负极、以活性炭(AC)作为正极组装锂离子电容器,研究其电化学性能。根据恒流充放电(GCD)和交流阻抗谱(EIS)研究了预嵌锂前后锂离子电容器的电化学性能。结果表明,嵌入适量的SLMP可消除碳纳米管大部分固有的不可逆容量并提高电容器的电化学性能。这种电容器具有较高的能量密度、功率密度和优异的循环性能。电流密度为0.05 A/g时预嵌锂碳纳米管锂离子电容器的比电容达到85.18 F/g,电流密度为0.05~4 A/g时最大能量密度和最大功率密度分别为140.4 Wh/kg和5.25 KW/kg,经过3000次循环后容量保持率仍约为82%。
The electrochemical performance of lithium-ion capacitors with stabilized lithium metal powder/multi-walled carbon nanotubes composite as anode and activated carbon as cathode was investigated by means of galvanostatic charge/discharge(GCD) tests and electrochemical impedance spectroscopy(EIS). The results show that the introduction of stabilized lithium metal powder can eliminate the majority of the inherent irreversible capacity of carbon nanotubes and greatly improve the electrochemical performance of lithium-ion capacitors. The lithium-ion capacitors have a specific capacitance of 85.18 F/g at the current density of 0.05 A/g. The maximum energy density and power density reached 140.4 Wh/kg and 5.25 KW/kg respectively in the current range of 0.05~4 A/g. The continuous galvanostatic charge-discharge cycling tests revealed that the lithium-ion capacitors could maintain 82% of the capacity after3000 cycles. In sum, the lithium-ion capacitors showed an excellent cycle performance with high energy and power density.
引文
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