The effect of nickel foam current collector in carbon electrode based electric double layer capacitor

J. H. Kim, K. H. Shin, C. S. Jin, D. K. Kim, Y. G. Kim, J. H. Park, Y. S. Lee, Y. S. Joo, K. H. Lee

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7 Citations (Scopus)

Abstract

Activated carbon (AC) powder as an active electrode material and open-pore nickel foam as a current collector material were used for an electric double layer capacitor (EDLC) with an aqueous electrolyte of KOH mixture. The electrochemical characteristics of the EDLC being made of 3 cm by 3 cm electrode size were investigated by charge-discharge cycle tests, impedance analyzer and cyclic voltametry measurements. As a current collector, nickel foam with concave surface and many open-pore showed larger specific capacitance and lower impedance than that of nickel foil with a flat surface. As results from experiments, much improved specific capacitance of about 300 F/g at 40 mA/cm2 of discharge current density and fairly low specific ESR of 0.63 Ωcm2 at 1 kHz were obtained from the EDLC with the nickel foam current collector. The specific leakage current was measured as 0.18 mA/cm2 with respect to the apparent electrode area of the EDLC with nickel foam current collector.

Original languageEnglish
Pages (from-to)853-857
Number of pages5
JournalElectrochemistry
Volume69
Issue number11
DOIs
Publication statusPublished - 2001 Nov

All Science Journal Classification (ASJC) codes

  • Electrochemistry

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