Nickel-Metal Hydride Battery

MH + NiOOH → M + Ni(OH)2

개요

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.

일상 속 예시

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

산업적 중요성

하이브리드 전기차(HEV), 디지털 카메라, 전동 공구의 충전지로 사용됩니다. 리튬이온 전지의 출현 전 친환경 이동수단의 주요 배터리였으며, 현재도 HEV에 널리 사용됩니다.

성질

유형
Electrochemical
가역 반응
예
에너지
발열
ΔH
-120.0 kJ/mol

관련 반응

Electrolysis of Water Electrolytic Production of Chlorate Electrorefining of Copper Alkaline Battery Discharge Anodizing of Aluminum Cathodic Protection (Zinc Sacrificial Anode) Chlor-Alkali Electrolysis Chrome Electroplating Sodium-Sulfur Battery Electrochemical CO₂ Reduction to CO

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.