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How efficient is hydrogen as an energy storage medium compared to e.g. Li-Ion batteries?
by i_am_proteus 7y ago
How efficient is hydrogen as an energy storage medium compared to e.g. Li-Ion batteries?
- barrkel 7y agoHydrogen is 3x more energy dense than diesel, and diesel is about 5 to 10x more energy dense than lithium ion batteries.
- murkle 7y agoBy mass or volume?
- Avshalom 7y agotrying to split the difference between https://en.wikipedia.org/wiki/Toyota_Mirai https://en.wikipedia.org/wiki/Toyota_Mirai https://en.wikipedia.org/wiki/Tesla_Model_S https://en.wikipedia.org/wiki/Tesla_Model_S https://en.wikipedia.org/wiki/Tesla_Model_3 https://en.wikipedia.org/wiki/Tesla_Model_3 I mean different shaped/sized cars and all but probably a bit worse? range vs weight seems about on par with the S but worse HP? but also https://en.wikipedia.org/wiki/Fuel_cell#Theoretical_maximum_efficiency https://en.wikipedia.org/wiki/Fuel_cell#Theoretical_maximum_... so ?
- peteradio 7y agoEfficiency as in energy/kg? Tesla batteries: 207 watt-hours per kilogram (per google search) Hydrogen: 120-142 MJ per kilogram (per google search) Conversion from MJ to watt-hours: 277.778 watt-hours per MJ 120*277.778/207 ~ 161 more compact. Assuming energy conversion losses are equal.
- i_am_proteus 7y agoEfficiency in terms of watts out from the medium divided by watts into the medium over a normal duty cycle.
- tigershark 7y agoAs I said in another comment with some napkin calculations is about 30%. Another user gave a 22% number compared to 73% for batteries. The difference is hugely in favour of batteries.