Journal of the Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회논문지)

The Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회)
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Addition Effects of Sheet-like Ni Nanopowder on the Electrochemical Properties of Positive Electrode in Ni-Zn Redox Flow Battery

Ni-Zn 레독스 플로우 전지에 있어서 양극의 전기화학적 특성에 미치는 쉬트 형상의 Ni 나노분말 첨가 효과

  • Seok, Hye-Won (Electronic materials & Module Team, Koewa Institute of Ceramics Engineering and Technology) ;
  • Kim, Sei-Ki (Electronic materials & Module Team, Koewa Institute of Ceramics Engineering and Technology) ;
  • Kang, Yang-Koo (Electronic materials & Module Team, Koewa Institute of Ceramics Engineering and Technology) ;
  • Hong, Yeon-Woo (Electronic materials & Module Team, Koewa Institute of Ceramics Engineering and Technology) ;
  • Lee, Young-Jin (Electronic materials & Module Team, Koewa Institute of Ceramics Engineering and Technology) ;
  • Kim, Beom-Su (Vitzrocell) ;
  • Ju, Byeong-Kwon (Display and Nanosystem Lab., Korea University)
  • 석혜원 (한국세라믹기술원 전자소재모듈팀) ;
  • 김세기 (한국세라믹기술원 전자소재모듈팀) ;
  • 강양구 (한국세라믹기술원 전자소재모듈팀) ;
  • 홍연우 (한국세라믹기술원 전자소재모듈팀) ;
  • 이영진 (한국세라믹기술원 전자소재모듈팀) ;
  • 김범수 (비츠로셀) ;
  • 주병권 (고려대학교 디스플레이 및 나노시스템연구실)
  • Received : 2014.07.10
  • Accepted : 2014.07.30
  • Published : 2014.09.01

Abstract

3 mol% Co-added $Ni(OH)_2$ fine powders, which showed ${\beta}$-phase, as positive electrode materials have been fabricated using $NiSO_4{\cdot}6H_2O$ aqueous solution by ultrasonic spray-chemical precipitation and subsequent hydrothermal method, and sheet-like Ni nanopowder was fabricated by mechano-chemical reduction method. The addition effects of the sheet-like Ni nanopowder on the electrochemical properties of the positive electrode in Ni-Zn Redox flow battery were investigated. Impedance spectroscopy revealed that the addition of the sheet-like Ni nanopowder resulted in decrease in the electrical resistivity; 10 wt.% addition reduced the electrical properties by a fifth. Cyclic voltammetry showed the addition of the sheet-like Ni nanopowder resulted in decrease in the potential difference of oxidation and reduction; this means the increase in the reversability for electrode reduction. Charge/discharge measurement confirmed that the addition of the sheet-like Ni nanopowder resulted in the increase in the discharge efficiency.

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