MnO2-Carbon nanotube composite for high-areal-density supercapacitors with high rate performance

被引:85
作者
Wang, Ke [1 ,2 ]
Gao, Shan [2 ]
Du, Zhaolong [2 ,3 ]
Yuan, Anbao [1 ]
Lu, Wei [2 ]
Chen, Liwei [2 ]
机构
[1] Shanghai Univ, Coll Sci, Shanghai 200444, Peoples R China
[2] Chinese Acad Sci, Suzhou Inst Nanotech & Nanobion, I Lab, Suzhou 215123, Peoples R China
[3] State Grid Smart Grid Res Inst, Beijing 102209, Peoples R China
基金
中国国家自然科学基金;
关键词
Pseudocapacitor; Supercapacitor; Mass loading; High power density; MnO2-CNT; High areal capacitance; ELECTROCHEMICAL CAPACITORS; MANGANESE-DIOXIDE; CARBON NANOTUBES; ASYMMETRIC SUPERCAPACITORS; ELECTRODE MATERIAL; HIGH-POWER; MNO2; PSEUDOCAPACITORS; BEHAVIOR; FILMS;
D O I
10.1016/j.jpowsour.2015.11.064
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Practical supercapacitor devices require high areal capacitance and area! power density, and thus demand high utilization of active material and good rate performance under high areal mass loading. However, ion transport in high-mass-loading electrodes can be a challenge, which leads to deteriorate specific capacitance and rate performance. In this paper, a well-dispersed porous MnO2-carbon nanotube (CNT) composite was prepared for use as a supercapacitor electrode material. The small MnO2 nano particles and porous CNT network facilitated fast electron/ion transfer kinetics in the electrode. With a mass loading as high as 6.4 mg cm(-2) on the electrode, the MnO2-CNT composite exhibited an excellent areal capacitance of 1.0 F cm(-2) at 0.2 A g(-1) (1.28 mA cm(-2)), with a retention of 77% even at a high current density of 20 A g(-1) (128 mA cm(-2)). The electrode exhibited a high power density of 45.2 kW kg(-1) (0.29 W cm(-2)) while maintaining a reasonable energy density of 16.7 Wh kg(-1) (106 mu Wh cm(-2)). No apparent fading was observed even after 3000 charge/discharge cycles at 1 A g(-1). This porous and evenly distributed MnO2-CNT composite has great potential for practical applications in supercapacitors. (C) 2015 Elsevier B.V. All rights reserved.
引用
收藏
页码:30 / 36
页数:7
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