Re: New battery technology?

["David Roden (Akron OH USA)" <roden@ald.net>]

On 23 Sep 2002 at 18:33, Lonnie Borntreger wrote:

> So, back to my original question, how does this rating look compared to
> current EV batteries in use?

Hmm.  I guess I spent so much time whining about the typos that I distracted 
everybody from the answer to that question, which ~was~ in the post (at 
least for lead and nicads).  

Here are typical specific energies for various chemistries. The ones for 
lead and nicad are by my calculation from various examples and some folks 
here may know of exceptions.  Still, I'm fairly confident that they 
represent practical capacity at real world EV currents (75~100 amps).  The 
other figures are from my rather disorganized notes and I don't know their 
origins, so take them with a grain of salt.

Standard lead acid	25-30 Wh/kg
Advanced lead acid	30-36 Wh/kg
Standard nicad		25-40 Wh/kg
Advanced nicad		50-55 Wh/kg
NiMH 				65-85 Wh/kg (Ovonics claims 90 for some)
Lithium Ion			100-150 Wh/kg (AES claims 120)
Lithium Polymer		150-200 Wh/kg (Electrovaya claims over 200)


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David Roden - Akron, Ohio, USA
1991 Solectria Force 144vac
1991 Ford Escort Green/EV 128vdc
1970 GE Elec-trak E15 36vdc
1974 Avco New Idea rider 36vdc
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