Nickel-Metal Hydride Battery

MH + NiOOH → M + Ni(OH)₂

Visão geral

NiMH batteries use a metal hydride anode (typically a rare earth/nickel alloy like AB₅ or AB₂) and nickel oxyhydroxide cathode in KOH electrolyte. Cell voltage is 1.2 V with energy density of 60–120 Wh/kg. They replaced NiCd batteries due to lack of toxic cadmium and higher capacity.

Exemplo do cotidiano

Rechargeable AA batteries (Eneloop, etc.) and early hybrid cars like the Toyota Prius used NiMH technology.

Importância industrial

As baterias NiMH alimentam milhões de veículos híbridos. O Toyota Prius utilizou NiMH desde 1997 até 2015, antes de transitar para iões de lítio.

Propriedades

Tipo: Electrochemical
Reversível: Sim
Energia: Exotérmico
ΔH: -120,0 kJ/mol

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Frequently Asked Questions

What is the equation for Nickel-Metal Hydride Battery?

The balanced equation is: MH + NiOOH → M + Ni(OH)₂.

What type of reaction is Nickel-Metal Hydride Battery?

Nickel-Metal Hydride Battery is a electrochemical reaction. It is reversible under certain conditions.

Is Nickel-Metal Hydride Battery exothermic or endothermic?

Nickel-Metal Hydride Battery is exothermic (releases energy). The enthalpy change (ΔH) is -120.0 kJ/mol.