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Nominal cell voltage. 1.2 V. 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). However, the negative electrodes use a hydrogen-absorbing alloy instead of cadmium.
Battery leakage is the escape ... when nickel–metal hydride batteries ... like the ones used in 1990s laptop battery packs, discharge at a rate of up to 2 ...
A nickel–hydrogen battery (NiH 2 or Ni–H 2) is a rechargeable electrochemical power source based on nickel and hydrogen. [5] It differs from a nickel–metal hydride (NiMH) battery by the use of hydrogen in gaseous form, stored in a pressurized cell at up to 1200 psi (82.7 bar) pressure. [6] The nickel–hydrogen battery was patented in the ...
Nickel–metal hydride. 66. 300–800 [13] Low self-discharge nickel–metal hydride battery. 500–1,500 [13] Lithium cobalt oxide. 90. 500–1,000. Lithium–titanate.
Where energy density is important, Ni–Cd batteries are now at a disadvantage compared with nickel–metal hydride and lithium-ion batteries. However, the Ni–Cd battery is still very useful in applications requiring very high discharge rates because it can endure such discharge with no damage or loss of capacity.
The 2011 Nissan Leaf had lower range and smaller battery capacity than the 1999 GM EV1. Nevertheless, it was a hit. The 1999 GM EV1 production vehicle, powered by nickel metal hydride batteries, had a 26.4 kWh battery and an EPA range of 105 miles.
A specific energy of 85.6 Wh/kg (308 kJ/kg) is obtained at room temperature equaling that of a conventional nickel–metal hydride battery, but with 100–1000 times greater specific power. [55] [56] The two-dimensional structure of graphene improves charging and discharging.
Self-discharge is a chemical reaction, just as closed-circuit discharge is, and tends to occur more quickly at higher temperatures. Storing batteries at lower temperatures thus reduces the rate of self-discharge and preserves the initial energy stored in the battery. Self-discharge is also thought to be reduced as a passivation layer develops ...