Nickel-Metal Hydride Battery

MH + NiOOH → M + Ni(OH)₂

Descripción general

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.

Ejemplo cotidiano

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

Importancia industrial

Las baterías NiMH alimentan millones de vehículos híbridos. El Prius de Toyota utilizó NiMH desde 1997 hasta 2015 antes de la transición a iones de litio, y siguen en producción para vehículos de alta fiabilidad.

Propiedades

Tipo: Electrochemical
Reversible: Sí
Energía: 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.