Chunlan (Group) Corperation

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For Ni/MH battery, metallic hydride is designed to be cathode active materials, Ni(OH)₂ to be anode active materials and potassium hydroxide water solution to be electrolyte. And its discharging mechanism is as following: when charging, hydrogen atom is made and diffuses to alloy and then MH generated. So in negative pole, hydrogen storage is realized; meanwhile, in nickel electrode, active material Ni(OH)₂ set free one electron and changes into charging status NiOOH. But during discharging, the hydrogen atom released by hydride will

beoxygenated into water on the surface of alloy and NiOOHabsords one electron and back to be Ni(OH)₂.

The electrochemistry reaction is as following:
Anode:

Cathode:

the overall reaction is as following:

Referring to the above formula, during the reaction, water has been engaged in reaction in both
poles. But in the whole reaction, water keeps in balance and no water consumption happens,
and this balance gives NiMH feature of maintenance free.

Law Manifesto