What is the electrochemical principle of nickel hydrogen batteries?

   Nickel hydrogen batteries use Ni oxide as the positive electrode, hydrogen storage metal as the negative electrode, and alkaline solution (mainly KOH) as the electrolyte

   When charging nickel hydrogen batteries: positive reaction: Ni (OH) 2 OH - → NiOOH H2O - e - negative reaction: M H2O e - → MH OH-

   When discharging nickel hydrogen batteries: positive reaction: NiOOH H2O e - → Ni (OH) 2 OH - negative reaction: MH OH - → M H2O e-

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