As the world shifts to renewables, there is a need for grid-level energy storage solutions and lithium-ion is too expensive and too cumbersome.
A nickel-hydrogen battery is much like any other battery with stacks of electrodes but held inside a pressurized gas tank. The cathode is made of nickel hydroxide, while the anode is hydrogen. When the battery is charged, the reaction produces hydrogen gas, which is oxidized during the discharging process to form water.The energy-storing process, which involves the production of highly combustible hydrogen gas and a pressurized tank to contain it, raises doubts.
Cost-wise, the manufacture of nickel-hydrogen batteries is currently more expensive than lithium-ion ones. Additionally, the energy storage density ofis the best we have achieved to date. This means a larger number of nickel-hydrogen batteries would be required to get the same output as Li-ion.
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