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

All Science Journal Classification (ASJC) codes

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

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