nikkelimetallihydrid

Nickel-metal hydride, often abbreviated as NiMH, is a type of rechargeable battery technology. These batteries are an improvement over older nickel-cadmium (NiCd) batteries, offering higher energy density and avoiding the "memory effect" that plagued NiCd cells. The positive electrode in a NiMH battery is typically made of nickel oxyhydroxide, while the negative electrode utilizes a hydrogen-absorbing alloy, often a mischmetal compound containing lanthanum, cerium, and nickel. During discharge, hydrogen atoms are released from the negative electrode and react with oxygen from the positive electrode to produce water, generating electrical energy. During charging, the process is reversed. NiMH batteries are commonly found in portable electronic devices such as digital cameras, cordless phones, and electric vehicles, though they are gradually being replaced by lithium-ion technology in many applications due to lithium-ion's superior energy density and longer lifespan. Despite this, NiMH batteries remain a viable and cost-effective option for certain uses where their specific characteristics are advantageous.