A123 Systems has made high quality LiFePO4 for many years.
They mostly are used in cordless tools, start-stop automotive systems,
and hybrid cars.
They make LiFePO4 cells for the Formula 1 KERS system that put out >>
20,000 W/kg. This is over 500 C discharge. They have unparalleled
specific power.
Bill D.
On 7/9/2020 1:11 PM, Alan Arrison via EV wrote:
Where are these mythical cells? They sure aren't from CALB.
Al
On 7/8/2020 8:06 PM, Bill Dube via EV wrote:
I don't think that LiFePO4 has made any remarkable gains in specific
energy.
What LiFePO4 does have is spectacular cycle life. If manufactured
with some degree of care, you get 15,000+, 100% SOC, 1C cycles @ 25
Celsius from LiFePO4 without going below 50% of the original
capacity. They just keep going and going.... You have to seal the
case well enough to keep air and water out, and use paste,
separators, etc. that are also reasonably free of water and air on
the inside.
Thus, a "million mile" battery has always be possible to make with
LiFePO4 cells. You just have to be motivated to use quality cells,
and to actually build it. You also need to be motivated to drive the
car that many miles. :-)
200 miles per charge, times 15,000 charge cycles = 3,000,000 miles.
Even at 5000 cycles, that run-of-the-mill LiFePO4 cells achieve, this
gets you a million miles.
Bill D.
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