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A nickel–metal hydride battery (NiMH or Ni–MH) is a type of rechargeable battery. The chemical reaction at the positive electrode is similar to that of the nickel–cadmium cell (NiCd), with both using nickel oxide hydroxide (NiOOH).
Nickel-metal hydride (NiMH) batteries have been a popular choice for various applications, particularly before the rise of lithium-ion technology. Here’s a detailed look at their advantages and disadvantages.
Nickel metal hydride batteries (NiMH) are a further development of nickel cadmium batteries (NiCd), with the aim to replace the poisonous cadmium. The nominal voltage is only 1.2 V, so that a large number of cells must be connected in series to achieve feasible battery voltages.
Nickel-metal hydride batteries are essentially an extension of the proven sealed nickel-cadmium battery technology with the substitution of a hydrogen-absorbing negative electrode for the cadmium-based electrode.
Nickel-metal-hydride is not without drawbacks. The battery is more delicate and trickier to charge than NiCd. With 20 percent self-discharge in the first 24 hours after charge and 10 percent per month thereafter, NiMH ranks among the highest in the class.
Nickel–Metal Hydride Battery. The nickel–metal hydride battery makes use of hydrogen for the positive electrode. This hydrogen is stored in alloy (i.e., metal hydride). The reactions of the battery during charging and discharging are illustrated in eqns [10]–[12].
A Nickel Metal Hydride (NiMH) battery is defined as a type of battery that replaces the cadmium-based electrode with a hydrogen storing metal alloy, typically a Rare Earth Mischmetal–nickel based metal alloy.
Ni-MH batteries are a type of rechargeable battery that uses a nickel oxide hydroxide (NiOOH) cathode and a hydrogen-absorbing alloy anode. This type of battery was developed as an improvement over Nickel-Cadmium (Ni-Cd) batteries, offering higher energy density and reduced environmental impact.
To meet this requirement, nickel-metal hydride batteries have been developed and manufactured with nickel hydroxide for the positive electrode and hydrogen-absorbing alloys, capable of absorbing and releas-ing hydrogen at high-density levels, for the negative electrode.
How NiMH Batteries Work. Nickel-metal hydride (NiMH) batteries are a type of rechargeable battery that operates based on the electrochemical reaction between nickel oxyhydroxide and metal hydride.