Re: GCR: GM battery chief: 600 mile EVs viable, million-mile battery in sight
Posted: Wed May 27, 2020 11:09 am
Not sure I understand. First of all, why is the mass of air important for comparing gravimetric energy density of fuels? The car doesn't have to carry that mass around. Second, how does the energy density of gasoline dictate a limit for the energy density of an electrical storage device?WetEV wrote: ↑Wed May 27, 2020 6:56 amLooks like I was incorrect, thanks for checking. There is less potential for improvement that I suggested.
Adding in the air mass is fairly easy. And I didn't do it.
https://en.wikipedia.org/wiki/Stoichiom ... mmon_fuels
13000Wh/kg/14.7 = 880 Wh/kg (gasoline air) or about 5x times for gasoline-oxygen or 4200Wh/kg as air is 21% oxygen.
So 16x today's batteries is about the limit. Not 50x. Practical limit is less, perhaps 4x. So a range of 1200 miles is about the best we could hope for. 12 hours at 100 miles per hour. Can anyone's brain, butt or bladder last that long?