Improved asymmetric electrochemical capacitor using Zn-Co co-doped Ni(OH)2 positive electrode material

Jong Hyeok Park, Sungwook Kim, O. Ok Park, Jang Myoun Ko

Research output: Contribution to journalArticle

36 Citations (Scopus)

Abstract

The performance of Ni-foam pasted Ni(OH)2 prepared from co-precipitated Ni(OH)2 with Zinc (Zn) and Cobalt (Co) as the positive electrode active material of an asymmetric electrochemical capacitor (EC) is studied for the enhancement of the capacitor's specific energy and power densities. A co-precipitated Ni(OH)2/activated carbon (AC) composite material and AC were used as a positive and negative electrode material. The AC in the positive electrode is used as an electrolyte reservoir to reduce ionic diffusion resistance regardless of charge/discharge current density. In addition, the simultaneous presence of Zn and Co ions in the Ni(OH)2 layer improves the efficiency of the active material and reduces the resistance of the unit cell. It was observed that through the effects of the additives in the positive electrode, the asymmetric EC exhibits a high energy density with 35.7 Wh/kg, based on the active material. Furthermore, the energy density decreasing behavior at a high discharge current density was retarded.

Original languageEnglish
Pages (from-to)593-597
Number of pages5
JournalApplied Physics A: Materials Science and Processing
Volume82
Issue number4 SPEC. ISS.
DOIs
Publication statusPublished - 2006 Mar 1

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Cobalt
Zinc
Capacitors
Activated carbon
Electrodes
Current density
Electrolytes
Foams
Ions
Composite materials

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)

Cite this

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abstract = "The performance of Ni-foam pasted Ni(OH)2 prepared from co-precipitated Ni(OH)2 with Zinc (Zn) and Cobalt (Co) as the positive electrode active material of an asymmetric electrochemical capacitor (EC) is studied for the enhancement of the capacitor's specific energy and power densities. A co-precipitated Ni(OH)2/activated carbon (AC) composite material and AC were used as a positive and negative electrode material. The AC in the positive electrode is used as an electrolyte reservoir to reduce ionic diffusion resistance regardless of charge/discharge current density. In addition, the simultaneous presence of Zn and Co ions in the Ni(OH)2 layer improves the efficiency of the active material and reduces the resistance of the unit cell. It was observed that through the effects of the additives in the positive electrode, the asymmetric EC exhibits a high energy density with 35.7 Wh/kg, based on the active material. Furthermore, the energy density decreasing behavior at a high discharge current density was retarded.",
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Improved asymmetric electrochemical capacitor using Zn-Co co-doped Ni(OH)2 positive electrode material. / Park, Jong Hyeok; Kim, Sungwook; Park, O. Ok; Ko, Jang Myoun.

In: Applied Physics A: Materials Science and Processing, Vol. 82, No. 4 SPEC. ISS., 01.03.2006, p. 593-597.

Research output: Contribution to journalArticle

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