Lithium-air has long existed as a possibility, with potential energy densities in the 11-14 kWh/kg range.
Diesel energy density is approx the same, but delivers only == 20% efficiency, or approx 3 kWh/kg.
Current production best is approx 0.260 kWh/kg (Tesla), on NMC tech.
Or about 50x less.
Soon, we expect to get approx 330-400 wH/kh, again from Tesla, in the new 27100 / version 4 chemistry, starting production late this year.
Current tech is is version C from Panasonic, a Tesla exclusive.
The above energy density differene is why, today, about 500 kg battery == 50 kg (60 k) of diesel, in range.
Of course, an electric car saves about 250 kg in smaller engine, transmission, and ancillaries, resulting in net 300 kg mass penalties, more or less.
Electrics use about 300 W/km, in a == 2000 kg large sedan.
80% of energy is conserved vie regen, so mass is not a major effector of range, and does add a lot of drivability (low COG and better rigidity), and safety.
-- -hanermo (cnc designs)
Posted by: Hannu Venermo <gcode.fi@gmail.com>
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