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  • NiH Battery

    NiH battery image

    Introduction

    NiH battery is eco-friendly and improved from Ni-Cd battery, which is used Ni instead of Cd to absorb H to achieve the result of environmental protection and lager electric capacity (2900mAh).

    Property

    Compared with NiCd battery, more eco-friendly and larger electric capacity.
    Compared with Li battery, higher self-discharge reaction.
    Compared with carbon and alkali battery, larger output electric.

    Chemical Principle

    During charging, H+ in KOH electrolyte is released absorb by chemicals to avoid H2, so that the inner pressure and volume can be remained. When the battery is discharged, the H+ will be back as where it is by the contrast route of charging.

    Property

    Voltage = 1.2V
    Power/weight = 30-80 Wh/kg, namely 108-880kJ/kg
    Power/Volume = 140-300 Wh/L, namely 504-1188kJ/kg
    Self-discharged rate = 30%/month,Low self-discharged is 15-30%/year
    Charge and discharge recycle number = 500 -1000
    The NiH battery is 30% larger in electric volume, lighter, longer life time and more eco-friendly than NiCd battery. However, it is much more expensive than NiCd battery and worse property than Li battery.

    Chemical Content

    The metals in NiH battery is mostly intermetallic compound, which can be divided into two categories. One is AB5, A refers to rare earth compound with Ti, and B refers to Ni, Co, Mn and Al. The other one is AB2, A is Ti or V, and B is Zr, or Ni, with Cr, Co, Fe, and Mn. The uses of these compound are the same, which are used to make metal hydride.

    Electrochemistry Principle

    KOH electrolytes (Electrolyte 7moL/LKOH+15g/LLiOH)

    Charging

    Positive Reaction: Ni(OH)2 + OH- → NiOOH + H2O + e-
    Negative Reaction: M + H2O + e- → MH + OH-
    Total Reaction: M + Ni(OH)2 → MH + NiOOH

    Discharging

    Positive: NiOOH + H2O + e- → Ni(OH)2 + OH-
    Negative: MH + OH- → M + H2O + e-
    Total Reaction: MH + NiOOH → M + Ni(OH)2
    Above, M refers to hydrogen storage alloy, MH refers to hydrogen storage alloy absorbed H, and the most widely used alloy is LaNi5.

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    Pictures

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    Price and Market

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    Related News and Information

    Defective Tungsten Oxide Lithium Battery May Free from Cobalt and Nickel

    IBM's Cobalt-Free Lithium Batteries Use Materials Extracted from Seawater

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