材料科学
阳极
石墨烯
阴极
超级电容器
功率密度
电容器
电解质
电化学
光电子学
纳米技术
电压
电气工程
电极
功率(物理)
化学
物理
工程类
物理化学
量子力学
作者
Huanwen Wang,Cao Guan,Xuefeng Wang,Hong Jin Fan
出处
期刊:Small
[Wiley]
日期:2014-11-03
卷期号:11 (12): 1470-1477
被引量:257
标识
DOI:10.1002/smll.201402620
摘要
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 (TiO 2 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 TiO 2 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 TiO 2 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.
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