Asymmetric supercapacitors using chemically prepared MnO2 as positive electrode materials

Ran Attias, Daniel Sharon, Arie Borenstein, David Malka, Ortal Hana, Shalom Luski, Doron Aurbach

Research output: Contribution to journalArticlepeer-review

49 Scopus citations

Abstract

Chemically prepared manganese dioxide (CMD), which is traditionally used as a cathode material for Li-ion batteries, was tested and characterized for the first time as a positive electrode material for hybrid supercapacitors with two different aqueous electrolyte solutions (6 M KOH and 0.5 M K2SO4). The CMD electrodes exhibit distinct electrochemical characteristics that depend on the electrolyte solution used. The CMD electrodes show higher specific capacitance in the basic electrolyte solution, 137 F/g, at a current density of 0.1 A/g. Asymmetric supercapacitors comprising CMD positive electrodes and activated carbon negative electrodes were fabricated and tested within an electrochemical window wider than the thermodynamic voltage limitation for aqueous solutions. The asymmetric supercapacitors based on KOH and K2SO4 showed very good electrochemical stability during more than 7000 charge-discharge cycles and reasonable energy and power density. The electrochemical performance of CMD/AC asymmetric supercapacitors, their easy assembly, and their low cost make these super capacitors promising as practical energy-storage devices.

Original languageAmerican English
Pages (from-to)A2231-A2237
JournalJournal of the Electrochemical Society
Volume164
Issue number9
DOIs
StatePublished - 2017
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2017 The Electrochemical Society.

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