A High Energy and Power Li-Ion Capacitor Based on a TiO2 Nanobelt Array Anode and a Graphene Hydrogel Cathode
A High Energy and Power Li-Ion Capacitor Based on a TiO2 Nanobelt Array Anode and a Graphene Hydrogel Cathode
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基于TiO2纳米带阵列阳极和石墨烯水凝胶阴极的高能大功率锂离子电容器
DOI：
10.1002/smll.201402620
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发表时间：
2015-03-25
期刊：
影响因子：
13.3
通讯作者：
Fan, Hong Jin
中科院分区：
文献类型：
--
作者：
Wang, Huanwen;Guan, Cao;Fan, Hong Jin
通过将电化学双层电容器型阴极（石墨烯水凝胶）与锂离子电池型阳极（TiO 2纳米带阵列）相结合，构建了一种具有高能量和功率密度的新型混合锂离子电容器（LIC）。高功率源由石墨烯水凝胶阴极提供，其具有3D多孔网络结构和高导电性，并且反阳极由直接在Ti箔上生长的独立式TiO 2纳米带阵列（NBA）制成，而不需要任何辅助材料。这种设计精巧的混合锂离子电容器允许在非水电解质中快速传输电子和离子。在0.0-3.8 V的电压范围内，在570 W kg（-1）的功率密度下实现82 Wh kg（-1）的高能量。即使在8.4 s的充电/放电速率下，也可以保持高达21 Wh kg（-1）的能量密度。这些结果表明，TiO 2 NBA//石墨烯水凝胶LIC表现出比超级电容器更高的能量密度和比锂离子电池更好的功率密度，这使其成为有前途的电化学电源。
A novel hybrid Li-ion capacitor (LIC) with high energy and power densities is constructed by combining an electrochemical double layer capacitor type cathode (graphene hydrogels) with a Li-ion battery type anode (TiO2 nanobelt arrays). The high power source is provided by the graphene hydrogel cathode, which has a 3D porous network structure and high electrical conductivity, and the counter anode is made of free-standing TiO2 nanobelt arrays (NBA) grown directly on Ti foil without any ancillary materials. Such a subtle designed hybrid Li-ion capacitor allows rapid electron and ion transport in the non-aqueous electrolyte. Within a voltage range of 0.0-3.8 V, a high energy of 82 Wh kg(-1) is achieved at a power density of 570 W kg(-1). Even at an 8.4 s charge/discharge rate, an energy density as high as 21 Wh kg(-1) can be retained. These results demonstrate that the TiO2 NBA//graphene hydrogel LIC exhibits higher energy density than supercapacitors and better power density than Li-ion batteries, which makes it a promising electrochemical power source.