A cheap asymmetric supercapacitor with high energy at high power: Activated carbon//K0.27MnO2·0.6H2O

Qunting Qu; Lei Li; Shu Tian; Wenling Guo; Yuping Wu; Rudolf Holze

doi:10.1016/j.jpowsour.2009.10.108

A cheap asymmetric supercapacitor with high energy at high power: Activated carbon//K_0.27MnO₂·0.6H₂O

Qunting Qu, Lei Li, Shu Tian, Wenling Guo, Yuping Wu, Rudolf Holze

Research output: Contribution to journal › Article › peer-review

188 Scopus citations

Abstract

Studies of the electrochemical behavior of K_0.27MnO₂·0.6H₂O in K₂SO₄ show the reversible intercalation/deintercalation of K⁺-ions in the lattice. An asymmetric supercapacitor activated carbon (AC)/0.5 mol l^-1 K₂SO₄/K_0.27MnO₂·0.6H₂O was assembled and tested successfully. It shows an energy density of 25.3 Wh kg^-1 at a power density of 140 W kg^-1; at the same time it keeps a very good rate behavior with an energy density of 17.6 Wh kg^-1 at a power density of 2 kW kg^-1 based on the total mass of the active electrode materials, which is higher than that of AC/0.5 mol l^-1 Li₂SO₄/LiMn₂O₄. In addition, this asymmetric supercapacitor shows excellent cycling behavior without the need to remove oxygen from the electrolyte solution. This can be ascribed in part to the stability of the lamellar structure of K_0.27MnO₂·0.6H₂O. This asymmetric aqueous capacitor has great promise for practical applications due to high energy density at high power density.

Original language	English
Pages (from-to)	2789-2794
Number of pages	6
Journal	Journal of Power Sources
Volume	195
Issue number	9
DOIs	https://doi.org/10.1016/j.jpowsour.2009.10.108
State	Published - 1 May 2010
Externally published	Yes

Keywords

Aqueous electrolyte
Electrochemical behavior
K
KMnO
Supercapacitor

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This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1016/j.jpowsour.2009.10.108

Cite this

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title = "A cheap asymmetric supercapacitor with high energy at high power: Activated carbon//K0.27MnO2·0.6H2O",

abstract = "Studies of the electrochemical behavior of K0.27MnO2·0.6H2O in K2SO4 show the reversible intercalation/deintercalation of K+-ions in the lattice. An asymmetric supercapacitor activated carbon (AC)/0.5 mol l-1 K2SO4/K0.27MnO2·0.6H2O was assembled and tested successfully. It shows an energy density of 25.3 Wh kg-1 at a power density of 140 W kg-1; at the same time it keeps a very good rate behavior with an energy density of 17.6 Wh kg-1 at a power density of 2 kW kg-1 based on the total mass of the active electrode materials, which is higher than that of AC/0.5 mol l-1 Li2SO4/LiMn2O4. In addition, this asymmetric supercapacitor shows excellent cycling behavior without the need to remove oxygen from the electrolyte solution. This can be ascribed in part to the stability of the lamellar structure of K0.27MnO2·0.6H2O. This asymmetric aqueous capacitor has great promise for practical applications due to high energy density at high power density.",

keywords = "Aqueous electrolyte, Electrochemical behavior, K, KMnO, Supercapacitor",

author = "Qunting Qu and Lei Li and Shu Tian and Wenling Guo and Yuping Wu and Rudolf Holze",

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T1 - A cheap asymmetric supercapacitor with high energy at high power

T2 - Activated carbon//K0.27MnO2·0.6H2O

AU - Qu, Qunting

AU - Li, Lei

AU - Tian, Shu

AU - Guo, Wenling

AU - Wu, Yuping

AU - Holze, Rudolf

PY - 2010/5/1

Y1 - 2010/5/1

N2 - Studies of the electrochemical behavior of K0.27MnO2·0.6H2O in K2SO4 show the reversible intercalation/deintercalation of K+-ions in the lattice. An asymmetric supercapacitor activated carbon (AC)/0.5 mol l-1 K2SO4/K0.27MnO2·0.6H2O was assembled and tested successfully. It shows an energy density of 25.3 Wh kg-1 at a power density of 140 W kg-1; at the same time it keeps a very good rate behavior with an energy density of 17.6 Wh kg-1 at a power density of 2 kW kg-1 based on the total mass of the active electrode materials, which is higher than that of AC/0.5 mol l-1 Li2SO4/LiMn2O4. In addition, this asymmetric supercapacitor shows excellent cycling behavior without the need to remove oxygen from the electrolyte solution. This can be ascribed in part to the stability of the lamellar structure of K0.27MnO2·0.6H2O. This asymmetric aqueous capacitor has great promise for practical applications due to high energy density at high power density.

AB - Studies of the electrochemical behavior of K0.27MnO2·0.6H2O in K2SO4 show the reversible intercalation/deintercalation of K+-ions in the lattice. An asymmetric supercapacitor activated carbon (AC)/0.5 mol l-1 K2SO4/K0.27MnO2·0.6H2O was assembled and tested successfully. It shows an energy density of 25.3 Wh kg-1 at a power density of 140 W kg-1; at the same time it keeps a very good rate behavior with an energy density of 17.6 Wh kg-1 at a power density of 2 kW kg-1 based on the total mass of the active electrode materials, which is higher than that of AC/0.5 mol l-1 Li2SO4/LiMn2O4. In addition, this asymmetric supercapacitor shows excellent cycling behavior without the need to remove oxygen from the electrolyte solution. This can be ascribed in part to the stability of the lamellar structure of K0.27MnO2·0.6H2O. This asymmetric aqueous capacitor has great promise for practical applications due to high energy density at high power density.

KW - Aqueous electrolyte

KW - Electrochemical behavior

KW - K

KW - KMnO

KW - Supercapacitor

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