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Studies on the improvement in performance of nickel-metal hydride battery

Research Project

Project/Area Number 05555172
Research Category

Grant-in-Aid for Developmental Scientific Research (B)

Allocation TypeSingle-year Grants
Research Field Inorganic materials/Physical properties
Research InstitutionUniversity of Osaka Prefecture

Principal Investigator

IWAKURA Chiaki  University of Osaka Prefecture, College of Engineering, Professor, 工学部, 教授 (00029183)

Co-Investigator(Kenkyū-buntansha) INOUE Hiroshi  University of Osaka Prefecture, College of Engineering, Research Associate, 工学部, 助手 (00213174)
MATSUOKA Masao  Ritsumeikan University Faculty of Science and Engineering, Associate Professor, 理工学部, 助教授 (10081340)
FURUKAWA Naoji  University of Osaka Prefecture, College of Engineering, Assistant Professor, 工学部, 講師 (70081338)
FUKUMOTO Yukio  University of Osaka Prefecture, College of Engineering, Associate Professor, 工学部, 助教授 (80081339)
Project Period (FY) 1993 – 1994
Project Status Completed (Fiscal Year 1994)
Budget Amount *help
¥4,800,000 (Direct Cost: ¥4,800,000)
Fiscal Year 1994: ¥1,700,000 (Direct Cost: ¥1,700,000)
Fiscal Year 1993: ¥3,100,000 (Direct Cost: ¥3,100,000)
KeywordsNickel-Metal Hydride Battery / Hydrogen Storage Systems / Pressure-Composition Isotherm / High Energy Density / Secondary Battery / Hydrogen Evolution Reaction / Hydrogen Diffusion Coefficient / High-rate Charge-Discharge Characteristics / ニッケル-水素化物電池 / 希土類系水素吸蔵合金 / ラーベス相水素吸蔵合金 / 水素電極反応 / 高エネルギー密度二次電池 / 高率放電特性 / 無公害二次電池 / 電気自動車用二次電池
Research Abstract

For the purpose of improving the performance of negative electrode in a nickel-metal hydride battery, the effects of surface modification of alloys by electroless plating, electroplating, treatment with an alkaline solution containing a reducing agent and mixing of metal oxides and bulk-composition control of alloys by the partial substitution of foreign metals for constituent metals and the deviation of alloy composition from stoichiometric ratio such as AB_2 and AB_5 on the electrochemical characteristics of hydrogen storage alloys were investigated. The information obtained from this work can be summarized as follows.
1. Electrochemical characteristics of the hydrogen storage alloys was improved by substituting foreign metals for a part of constituent metals and deviating alloy composition from stoichiometric ratio such as AB_5 and AB_2.
2. Catalytic activity for hydrogen electrode reaction and high-rate chargeability increased by modifying various metals and metal oxides on the surface of the rare earth hydrogen storage alloys.
3. Surface modification of the Laves-phase hydrogen storage alloys by a reducing agent resulted in easier initial activation and the increase in the high-rate dischargeability.
4. Diffusion coefficient of hydrogen in the hydrogen storage alloys evaluated from the potential step method increased by substituting foreign metals having smaller atomic radius for constituent metals.
5. Additional deviations of the alloy composition from the stoichiometric ratio lead to the decrease in activation energy for the hydrogen diffusion in the hydrogen storage alloys and the increase in discharge efficiency.
Thus, several guidelines of designing the hydrogen storage alloys and developing the negative electrodes for high performance secondary batteries could be proposed.

Report

(3 results)
  • 1994 Annual Research Report   Final Research Report Summary
  • 1993 Annual Research Report
  • Research Products

    (19 results)

All Other

All Publications (19 results)

  • [Publications] M.Matsuoka, M.Terashima, C.Iwakura: "Effect of Alloy Composition on Charge and Discharge Characteristics of the Negative Electrode for Nickel-Hydrogen Batteries" Electrochim.Acta. 38-8. 1087-1092 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] C.Iwakura, Y.Yamaoka, A.Nozue, M.Matsuoka, N.Furukawa: "Electrochemical Preparation and Characterization of Ni/ (Ni+LaNi_5)Composite Coating Electrode" Chemistry Express. 8-9. 813-816 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] K.Naitoh, T,Matsunami, K.Okuno, M.Matsuoka, C.Iwakura: "Factors Affecting the Characteristics of the Negative Electrodes for nickel-Hydrogen Batteries" J.Appl.Electrochem.23-10. 1051-1055 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] K.Naitoh, T.Matsunami, K.Okuno, M.Matsuoka, C.Iwakura: "Electrochemical Characteristics of Hydrogen Storage Alloys Modified by Electroless Nickel Coatings" J.Appl.Electrochem.24-8. 808-813 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] C.Iwakura, M.Matsuoka, T.Kohno: "Mixing Effect of Metal Oxides on Negative Electrode Reactions in Nickel-Hydride Battery" J.Electrochem.Soc.141-9. 2306-2309 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] Y.Fukumoto, M.Miyamoto, M.Matsuoka, C.Iwakura: "Effect of the Stoichiometric Ratio on Electrochemical Properties of Hydrogen Storage Alloys for Nickel-Metal Hydride Batteries" Electrochim.Acta. (in press).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] C.Iwakura, I.Kim, N.Matsui, H.Inoue, M.Matsuoka: "Surface Modification of Laves-phase ZrV_<0.5>Mn_<0.5>Ni Alloy Electrodes with an Alkaline Solution Containing Potassium Borohydride as a Reducing Agent" Electrochim.Acta.(in press).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] C.Iwakura, M.Miyamoto, H.Inoue, M.Matsuoka, Y.Fukumoto: "Kinetics of Hydrogen Evolution Reaction at Nonstoichiometric Hydrogen Storage Alloys for Nickel-Hydrogen Batteries" J.Alloys Comp.(in press).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] Y.Fukumoto, M.Miyamoto, H.Inoue, M.Matsuoka, C.Iwakura: "Electrochemical Properties of the Nonstoichiometric Hydrogen Storage Alloys for Nickel-Hydrogen Batteries" J.Alloys Comp.(in press).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] C.Iwakura, M,Miyamoto, H.Inoue, M.Matsuoka, Y.Fukumoto: "Kinetics of Hydrogen Evolution reaction at Stoichiometric and Nonstoichiometric Hydrogen Storage Alloys for Nickel-Hydrogen Batteries" Submitted to J.Electroanal.Chem.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] C.Iwakura, T.Oura, H.Inoue, M.Matsuoka: "Effects of Substitution with Foreign Metals on the Crystallographic, Thermodynamic and Electrochemical Properties of AB_5-Type Hydrogen Storage Alloys" Submitted to Electrochim.Acta.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] C.Iwakura, T.Oura, H.Inoue, M.Matsuoka: "Effect of Alloy Composition on Hydrogen Diffusion in the AB_5-Type Hydrogen Storage Alloys" Submitted to J.Electroanal.Chem.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] Chiaki Iwakura: "Mixing Effect of Metal Oxides on Negative Electrode Reactions in Nickel-Hydride Battery" J.Electrochem.Soc.141. 2306-2309 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] Yukio Fukumoto: "Effect of the Stoichiometric Ratio on Electrochemical Properties of Hydrogen Storage Alloys for Nickel-Hydrogen Batteries" Electrochim,Acta. (in press). (1995)

    • Related Report
      1994 Annual Research Report
  • [Publications] Chiaki Iwakura: "Surface Modification of Laves-phase ZrV_<0.6>Mn_<0.6>Ni Alloy Electrodes with an Alkaline Solution Containing Potassium Borohyrdride as a Reducing Agent" Electrochim,Acta. (in press). (1995)

    • Related Report
      1994 Annual Research Report
  • [Publications] Yukio Fukumoto: "Electrochemical Properties of the Nonstoichiometric Hydrogen Storage Alloys for Nikel-Hydrogen Batteries" J.Alloys Comp.(in press). (1995)

    • Related Report
      1994 Annual Research Report
  • [Publications] Chiaki Iwakura: "Kinetics of Hydrogen Evolution Reaction at Nonstoichiometric Hydrogen Storage Alloys for Nickel-Hydrogen Batteries" J.Alloys Comp.(in press). (1995)

    • Related Report
      1994 Annual Research Report
  • [Publications] 岩倉 千秋: "分散めっき法によるNi/(Ni+LaNi_5)複合皮膜電極の作製とキャラクタリゼーション" Chem.Express. 8. 813-816 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] Kaoru Naito: "Electrochemical Characteristics of Hydrogen Storage Alloys Modified by Electroless Nickel Coatings" J.Appl.Electrochem.24,(in press). (1994)

    • Related Report
      1993 Annual Research Report

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Published: 1993-04-01   Modified: 2016-04-21  

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