Nickel-Metal Hydride Battery

MH + NiOOH → M + Ni(OH)2

概要

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.

日常の例

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

産業上の重要性

NiMH電池は数百万台のハイブリッド車に搭載されている。トヨタプリウスは1997〜2015年にNiMHを採用し、リチウムイオン電池への移行後も低コスト・安全性の高さからHEV向けに継続利用されている。

特性

タイプ
Electrochemical
可逆的
はい
エネルギー
発熱性
ΔH
-120.0 kJ/mol

関連する反応

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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.