Colloidal Ionic Supercapacitors

Authors

Kun-feng CHEN, State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China;
Dong-feng XUE, State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China;Follow

Corresponding Author

Dong-feng XUE(dongfeng@ciac.ac.cn)

Abstract

Supercapacitors have high power density and long cycle life compared with battery systems, but they still suffer from low energy density at the same time. In order to increase the energy density of supercapacitors, we have developed a new type of pseudocapacitor, called colloidal ion supercapacitor, which can directly use commercial metal salts as electrode materials and form electroactive matter by in-situ electrochemical reactions without the need of additional materials synthesis processes. Colloidal ion supercapacitor can fully utilize the redox reaction of metal cations with multiple oxidation states, which can completely release the stored electrical energy of multiple-valence cations, leading to high energy density. Due to the presence of colloidal cation ions in the colloidal ion supercapacitor, the diffusion length of electrons and ions can be shortened, leading to high redox reaction kinetics and high power density. Both high energy density and high power density can exist in one supercapacitor devices, called colloidal ionic supercapacitor. This review outlines the concept, basis and the development of colloidal ion supercapacitors, the latest research progresses and the facing future challenges. We hope that colloidal ion supercapacitor can advance the development of the next generation of high-performance electrochemical energy storage devices.

Graphical Abstract

Keywords

supercapacitor, electroactive cation, pseudocapacitor, electrochemical reaction, rare earth

DOI Link

https://doi.org/10.13208/j.electrochem.150842

Publication Date

2015-12-23

Online Available Date

2015-11-02

Revised Date

2015-09-25

Received Date

2015-08-25

Recommended Citation

Kun-feng CHEN, Dong-feng XUE. Colloidal Ionic Supercapacitors[J]. Journal of Electrochemistry, 2015 , 21(6): 534-542.
DOI: 10.13208/j.electrochem.150842
Available at: https://jelectrochem.xmu.edu.cn/journal/vol21/iss6/4

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