Robin, I thought what you did when I first looked at their page -- but
then I stared at the page for a while and poked around on their site a
bit and it turned out what they were saying made sense after all.
Robin van Spaandonk wrote:
In reply to Terry Blanton's message of Tue, 29 Apr 2008 13:25:12 -0400:
Hi,
[snip]
The SCiB is finally in production:
http://www3.toshiba.co.jp/sic/english/scib/index3.htm
"High power density even equal to that of a capacitor"
Unfortunately capacitors have lousy power density.
Not exactly; capacitors have lousy ENERGY density. Energy isn't power,
of course, but sloppy usage is so common we tend to expect it. As it
turns out Toshiba has indeed kept the definitions of power and energy
straight, and they said exactly what they intended to say.
If you dig around on the site, you'll find that they use "Power density"
to mean how much power can be sourced as a function of the mass of
batteries in use. On this page:
http://www3.toshiba.co.jp/sic/english/scib/detail.htm
they show a scatter plot with power density in W/kg on the Y axis and
energy density in Wh/kg on the X axis, and they put capacitors, their
new battery, NiMH, and Li batteries on the plot to show their
performance. The illustration is here:
http://www3.toshiba.co.jp/sic/english/scib/image/feature3.gif
The plot makes it clear that what they're saying is that their /energy/
density is that of a battery, but their /power/ density is comparable to
a large capacitor.
They don't give any numbers, though; it's just marketing slides. But at
least the axes make sense.
Regards,
Robin van Spaandonk
The shrub is a plant.
