Effect of electrode balance on performance degradation and gas emission in stacked-type electrochemical capacitors

Yu Tack Kim, Kwang Bum Kim, Chang Soo Jin, Eo Hyun Yoo

Research output: Contribution to journalArticle

Abstract

For electrochemical capacitor, the specific capacitance in positive is not equal to negative because of different sizes between cation and anion such as TEABF4/PC. In stacked-type of electrochemical capacitor, the optimized stacked-type cell generates gas 25% lower than current stacked-type cell. Our results show that H2 gas emitted from current stacked-type is twice that from optimized stacked-type; the proportion of CO in current stacked-type is similar to optimized stacked-type, while that of CO2 in optimized stacked-type is 73% of that in current stacked-type. The working voltages of the current stacked-type capacitor and optimized stacked-type are expected to be around 3.3V and below 3.0V, respectively, because the amount of gas emissions from optimized stacked-type is estimated to be 30% less than that from current stacked-type. And higher reliability is shown in optimized stacked-type with alkali activated carbon in positive and steam activation carbon in negative. The generated gas volume by optimized stacked-type with different carbon is decreased around 50% than current stacked-type electrochemical capacitor.

Original languageEnglish
Pages (from-to)1123-1132
Number of pages10
JournalMetals and Materials International
Volume21
Issue number6
DOIs
Publication statusPublished - 2015 Nov 1

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electrochemical capacitors
Gas emissions
Capacitors
degradation
Degradation
Electrodes
electrodes
Gases
gases
Carbon
Steam
Alkalies
Carbon Monoxide
Activated carbon
Anions
Cations
Capacitance
Negative ions
carbon
Positive ions

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry

Cite this

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abstract = "For electrochemical capacitor, the specific capacitance in positive is not equal to negative because of different sizes between cation and anion such as TEABF4/PC. In stacked-type of electrochemical capacitor, the optimized stacked-type cell generates gas 25{\%} lower than current stacked-type cell. Our results show that H2 gas emitted from current stacked-type is twice that from optimized stacked-type; the proportion of CO in current stacked-type is similar to optimized stacked-type, while that of CO2 in optimized stacked-type is 73{\%} of that in current stacked-type. The working voltages of the current stacked-type capacitor and optimized stacked-type are expected to be around 3.3V and below 3.0V, respectively, because the amount of gas emissions from optimized stacked-type is estimated to be 30{\%} less than that from current stacked-type. And higher reliability is shown in optimized stacked-type with alkali activated carbon in positive and steam activation carbon in negative. The generated gas volume by optimized stacked-type with different carbon is decreased around 50{\%} than current stacked-type electrochemical capacitor.",
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Effect of electrode balance on performance degradation and gas emission in stacked-type electrochemical capacitors. / Kim, Yu Tack; Kim, Kwang Bum; Jin, Chang Soo; Yoo, Eo Hyun.

In: Metals and Materials International, Vol. 21, No. 6, 01.11.2015, p. 1123-1132.

Research output: Contribution to journalArticle

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