Strategies to Enhance Energy Density for Supercapacitors

Authors

Jun-wei LANG, Laboratory of Clean Energy Chemistry and Materials, State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Lanzhou 730000, P. R. China;
Xu ZHANG, Qingdao Center of Resource Chemistry & New Materials, Qingdao 266000, P.R. China;
Ru-tao WANG, Laboratory of Clean Energy Chemistry and Materials, State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Lanzhou 730000, P. R. China;
Xing-bin YAN, Laboratory of Clean Energy Chemistry and Materials, State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Lanzhou 730000, P. R. China;Qingdao Center of Resource Chemistry & New Materials, Qingdao 266000, P.R. China;Follow

Corresponding Author

Xing-bin YAN(xbyan@licp.cas.cn)

Abstract

The biggest advantage of supercapacitor lies in not only the excellent pulse and fast charging-discharging performance, but also the characteristics of long cycle life and wide operating temperature window with no pollution. However, the energy density of supercapacitor is low. In this paper, the working principle, the development status, defects and improvement method of supercapacitors are introduced. Based on the research workes of the supercapacitors with high energy density in our group, combined with the literature reports in recent years, the strategies to promote the energy density of supercarpacitors will be focused. The strategies for the enhancement of energy density include: 1) to increase the specific capacitance of the electrode by reducing the existing materials to nano sizes or to develop new materials with high capacity; 2) to increase the voltage window of the supercapacitor by developing ionic liquid electrolyte with high voltage window or to adopt asymmetric supercapacitors in which one electrode is pseudocapacitive, while the other utilizes double layer capacitance; 3) to build lithium ion hybrid supercapacitors with both high energy density and high power density by “internal cross” the supercapacitor and lithium ion battery. Finally, the prospects in the future development of supercapacitors will be provided.

Graphical Abstract

Keywords

supercapacitor, asymmetric supercapacitor, lithium-ion hybrid supercapacitor, energy density, power density

DOI Link

https://doi.org/10.13208/j.electrochem.170348

Publication Date

2017-10-28

Online Available Date

2017-07-26

Revised Date

2017-07-25

Received Date

2017-06-13

Recommended Citation

Jun-wei LANG, Xu ZHANG, Ru-tao WANG, Xing-bin YAN. Strategies to Enhance Energy Density for Supercapacitors[J]. Journal of Electrochemistry, 2017 , 23(5): 507-532.
DOI: 10.13208/j.electrochem.170348
Available at: https://jelectrochem.xmu.edu.cn/journal/vol23/iss5/3