• JohnDClay@sh.itjust.works
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    1 year ago

    But a hydrogen battery has much much better specific energy than lithium ion. So you can have a much longer range.

    • Pipoca@lemmy.world
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      1 year ago

      Hydrogen is very light, so the energy per kilogram is quite high.

      However, hydrogen is also naturally not very dense. Hydrogen at 1 atmosphere has a tiny fraction of the energy of a similar volume of batteries. Pressurized hydrogen is similarly dense to a battery, and liquid hydrogen is about twice as dense.

      So to make hydrogen dense, you need a very thick, heavy tank to hold the pressurized hydrogen. That significantly cuts into your weight advantages.

      Add to that, fuel cells are very inefficient at converting hydrogen to usable electricity.