Re: [Vo]:Toshiba Bettery

[Stephen A. Lawrence]

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.