High-Performance Hybrid Supercapacitor Based on Graphene-Wrapped Mesoporous T-Nb2O5 Nanospheres Anode and Mesoporous Carbon-Coated Graphene Cathode
High-Performance Hybrid Supercapacitor Based on Graphene-Wrapped Mesoporous T-Nb2O5 Nanospheres Anode and Mesoporous Carbon-Coated Graphene Cathode
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基于石墨烯包裹介孔T-Nb2O5纳米球阳极和介孔碳涂层石墨烯阴极的高性能混合超级电容器
DOI：
10.1002/celc.201600181
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发表时间：
2016-09-01
期刊：
影响因子：
4
通讯作者：
Huo, Kaifu
中科院分区：
文献类型：
--
作者：
Ma, Guoqiang;Li, Ke;Huo, Kaifu
锂离子混合超级电容器结合了锂离子电池和超级电容器的优点，由于其在高功率密度下的高能量密度，一直是储能领域的研究热点。在这里，我们报道了还原氧化石墨烯(RGO)交联介孔T-Nb2O5纳米球(T-Nb2O5MnSs/rGO)作为高性能的Li+插层伪电容材料和介孔碳包覆RGO(MC/rGO)作为高功率双电层电容材料。T-Nb_2O_5 MnS/rGO负极材料在20mAg(-1)的电流密度下具有181mAhg(-1)的高可逆容量，循环稳定性好，1000次循环后容量保持率达85%，以及优异的倍率性能。MC/rGO正极材料在3-4.5V(vs.Li/Li+)的电压范围内，在有机电解液中的电流密度为500和10000mAg(-1)时，可提供110和86Fg(-1)的大容量。以T-Nb2O5MnSs/rGO为阳极，MC/rGO为阴极的新型Li-HSC在21wkg(-1)下的功率密度最高，达到25600Wkg(-1)，远高于已报道的同类Li-HSC系统。此外，Li-HSCs表现出良好的循环性能，4000次循环后容量保持率达82%。
Lithium-ion hybrid supercapacitors combining the advantages of Li-ion batteries and supercapacitors have been the subject of extensive interest in the field of energy storage because of their high energy density at high power density. Herein, we report reduced graphene oxide (rGO) cross-linked mesoporous T-Nb2O5 nanospheres (T-Nb2O5 MNSs/rGO) as high-performance Li+ intercalation pseudocapacitive material and mesoporous carbon-coated rGO (MC/rGO) as high-power electric double-layer capacitive material. The T-Nb2O5 MNSs/rGO anode material boasts a high reversible capacity of 181mAhg(-1) at a current density of 20mAg(-1), good cycle stability, with 85% capacity retention after 1000 cycles, as well as excellent rate capability. The MC/rGO cathode material delivers a large capacity of 110 and 86Fg(-1) at a current density of 500 and 10000mAg(-1) in organic electrolyte in the voltage range of 3-4.5V (vs. Li/Li+). The advanced Li-HSCs with a T-Nb2O5 MNSs/rGO anode combined with a MC/rGO cathode show the highest power density of 25600Wkg(-1) at 21Whkg(-1), which is much higher than that of similar Li-HSC systems previously reported. Furthermore, the Li-HSCs exhibit an excellent cyclability, with 82% capacitance retention after 4000 cycles.