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Question

What is a nickel metal hydride battery?


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Solution

  1. A nickel-metal hydride (NiMH) battery has an alkaline electrolyte which is Potassium hydroxide (KOH).
  2. It is a type of rechargeable battery.
  3. The negative electrode (anode) consists of a metallic hydride compound, M.
  4. Positive electrode (cathode) is Nickel hydroxide or Ni(OH)2.
  5. The reactions occur from the left to the right direction during charging and right to left direction during discharge.
  6. The reaction at the negative electrode is,
    H2O(l)+M(s)+e-DischargeChargingOH-(aq)+MH(s)
  7. The reaction at the positive electrode is,
    Ni(OH)2(s)+OH-(aq)DischargeChargingNiO(OH)(s)+H2O(l)+e-NickelhydroxideNickeloxyhydroxide
  8. It is commonly used in laptops, phones, camcorders, or other electronic devices.
  9. These batteries have a higher voltage than Ni-Cd batteries.

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