Intercalation pseudo-capacitive TiNb2O7 carbon electrode for high-performance lithium ion hybrid electrochemical supercapacitors with ultrahigh energy density
Intercalation pseudo-capacitive TiNb2O7 carbon electrode for high-performance lithium ion hybrid electrochemical supercapacitors with ultrahigh energy density
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DOI：
10.1016/j.nanoen.2015.04.011
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发表时间：
2015-07-01
期刊：
影响因子：
17.6
通讯作者：
Shen, Guozhen
中科院分区：
文献类型：
--
作者：
Wang, Xianfu;Shen, Guozhen
锂离子混合电化学超级电容器(Li-HESCs)具有比充电电池更高的功率密度和与超级电容器相当的能量密度，是近年来为满足实际应用而发展起来的。用TiNb2O7@碳负极和碳纤维正极设计了一种新型的Li-HESC。TiNb207碳是一种新型的锂离子嵌锂准电容电极，在1.0~3.0Vvs Li+/Li的电位窗口，电流密度为0.2A/g时，容量为280 mA h/g。当电流密度为0.1A/g时，该电极的比电容为759F/g，与0.1A/g的Li+/Li相比，与碳纤维电极组装成Li-HESC时，在功率密度为99.58W/kg时获得了110.4 Wh/kg的超高能量密度，即使在5464W/kg的功率密度下也保持在20Wh/kg，远远高于基于碳纤维/碳纤维的对称超级电容器CMK-3/CMK-3和其他一些Li-hESCs。表明了其在混合动力汽车和电动汽车中的潜在实际应用。(C)2015爱思唯尔有限公司。保留所有权利。
Lithium ion hybrid electrochemical supercapacitors (Li-HESCs) with higher power density than rechargeable batteries and comparative energy density with supercapacitor have been developed recently to meet the practical applications. A novel Li-HESC is designed in this work with TiNb2O7@carbon negative electrode and carbon fibers positive electrode. TiNb207 carbon, a new type lithium ion intercalation pseudo-capacitance electrode, exhibits a capacity of 280 mA h/g at a current density of 0.2 A/g in the potential window of 1.0-3.0 V vs. Li+/Li. Meanwhile, the electrode shows a high specific capacitance of 759 F/g when calculated between 1.0 and 2.0 V vs. Li+/Li at current density of 0.1 A/g. When assembled into a Li-HESC with carbon fiber electrode, an ultrahigh energy density of 110.4 Wh/kg is obtained at power density of 99.58 W/kg, which also remains at 20 W h/kg even under power density of 5464 W/kg, much higher than those of the symmetric supercapacitors based on carbon fibers/ / carbon fibers, CMK-3/ / CMK-3, and some other Li-HESCs, indicating its potential practical applications in hybrid electric vehicles and electric vehicles. (C) 2015 Elsevier Ltd. All rights reserved.