Problem: What environmental advantage is provided by the use of nickel-metal-hydride batteries over the nickel-cadmium batteries?

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We are asked to determine the environmental advantage provided by the use of nickel-metal-hydride batteries over nickel-cadmium batteries.

We have different types of batteries:


  • dry-cell battery: also called a galvanic electric cell or alkaline battery and the one used for common flashlights.
  • lithium-ion battery: a rechargeable battery that is used for home electronics.
  • lead-acid storage battery: used for cars and automobiles.
  • NiCad battery: contains nickel and cadmium; originally used for the flashlight and is rechargeable. However, Cd is toxic and the battery is hard to dispose of.
  • fuel cell: usually used as back-up power in commercial, industrial, or residential areas.
  • nickel-metal hydride (NiMH or Ni–MH), is a type of rechargeable battery. The chemical reaction at the positive electrode is similar to that of the nickel–cadmium cell, with both using nickel oxide hydroxide. However, the negative electrodes use a hydrogen-absorbing alloy instead of cadmium.


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Problem Details

What environmental advantage is provided by the use of nickel-metal-hydride batteries over the nickel-cadmium batteries?

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