Enhanced electrochemical performances of cylindrical hybrid supercapacitors using activated carbon/Li4-xMxTi5-yNyO12 (M = Na, N = V, Mn) electrodes
Enhanced electrochemical performances of cylindrical hybrid supercapacitors using activated carbon/Li4-xMxTi5-yNyO12 (M = Na, N = V, Mn) electrodes
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DOI：
10.1016/j.energy.2016.04.128
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发表时间：
2016-08-15
期刊：
影响因子：
9
通讯作者：
Lee, Seung-Hwan
中科院分区：
文献类型：
--
作者：
Kim, Hong-Ki;Lee, Seung-Hwan
以活性炭为阴极，Li4-xMxTi5-yNy(O) over dot(12) （M = Na, N = V, Mn）为阳极制备了圆柱形杂化超级电容器。研究了掺杂剂对电化学性能的影响。虽然所有掺杂剂都会影响混合超级电容器的电化学性能，但值得注意的是，Na和V掺杂剂不仅可以提高电导率，还可以降低工作电压。通过这些协同效应，采用Li4Ti4.7V0.3O12、Li3.7Na0.3Ti5O12阳极的混合超级电容器的电化学性能得到了显著提高。特别是以Li4Ti4.7V0.3O12为阳极的复合型超级电容器，在40℃下，在2.5 Ag-1电流密度下，经过5000次循环后，由于其低的电荷转移电阻，电容保留率达到了94.6%。因此，Li4Ti4.7V0.3O12可以作为混合超级电容器最佳电化学性能的负极材料。(C) 2016 Elsevier Ltd.版权所有。
Cylindrical hybrid supercapacitors were fabricated using activated carbon as a cathode and Li4-xMxTi5-yNy(O) over dot(12) (M = Na, N = V, Mn) as an anode. We investigated the effect on the electrochemical performances of dopants. Although all dopants affect the electrochemical performances of hybrid super capacitors, it is notable that the Na and V dopants not only improve the conductivity but also lower the operating voltage. Through these synergetic effects, the electrochemical performances of hybrid super capacitors using Li4Ti4.7V0.3O12, Li3.7Na0.3Ti5O12 anodes were significantly improved. Especially the hybrid supercapacitor using Li4Ti4.7V0.3O12 anode shows the extraordinary capacitance retentions of 94.6% after 5000 cycles at a current density of 2.5 Ag-1 at 40 degrees C due to its low charge-transfer resistance. Therefore, the Li4Ti4.7V0.3O12 can be regarded as an anode material for optimum electrochemical performances of hybrid supercapacitors. (C) 2016 Elsevier Ltd. All rights reserved.