【摘要】 由于具有良好的能量和功率特性,以及钠资源丰富和成本低,钠离子混合电容器（SIHCs）在大规模储能应用中受到了广泛的关注.然而,负极材料缓慢的动力学严重限制了SIHC器件的整体电化学性能.本文报道了一种纳米管状硬碳（NTHC）负极材料用于制作高性能SIHC,这种材料是通过高温碳化（1150℃）聚苯胺（PANI）得到的.结果显示,NTHC作为钠离子半电池负极,在0.05 A g^-1下具有高的可逆容量(419.5 mA h g^-1)和优异的倍率性能.利用HCNT作为负极和高容量活性炭（APDC）作为正极组装的SIHC器件在2850 W kg^-1的功率密度下表现出的能量密度高达133.0W h kg^-1,当功率密度高达14250 W kg^-1条件下器件能量密度仍然保持100.9 W h kg^-1;在1.5-3.5V的电位范围内,器件展现出良好的循环稳定性,在2 A g^-1条件下循环12000次后其容量保持率高达82.5%.更多还原

【Abstract】 Sodium ion hybrid capacitors（SIHCs） are of great concern in large-scale energy storage applications due to their good energy-and-power characteristic, as well as abundant reserves and low cost of sodium. However, the sluggish faradaic kinetics of anode materials severely limit the overall electrochemical performance of SIHC devices. Herein, we report an application of nanotube-like hard carbon（NTHC）anode material prepared by high-temperature carbonization（1150℃） of polyaniline（PANI） nanotubes for high-performance SIHCs. As a result, the assembled sodium ion half-cell with NTHC shows a high reversible capacity of 419.5 mA h g^-1at 0.05 A g^-1and a good rate performance of 74.6 mA h g^-1 at 2.5 A g^-1 in a potential window of 0-2 V（vs. Na/Na⁺）. On this basic, a SIHC using such NTHC as anode and a high-capacity activated carbon（APDC） as cathode is fabricated, which exhibits a high energy density of 133.0 W h kg^-1 at 2850 W kg^-1and still remains 100.9 W h kg^-1 at 14,250 W kg^-1. Within the potential range of 1.5-3.5 V, the SIHCs display an outstanding cycling stability tested at 2 A g^-1 with a good capacity retention of 82.5% even after 12,000 cycles.更多还原