[FoRK] Super batteries, Electric cars with fast-swap batteries

Simon Dann simon at photogabble.co.uk
Thu Mar 19 04:26:03 PDT 2009

I would love those in my laptop, I have to leave the thing on charge
overnight to get it to 100% or 2 hours to 90% odd?

On Wed, Mar 18, 2009 at 8:14 AM, Stephen D. Williams <sdw at lig.net> wrote:

> We'll see how long it takes to get to market.
> http://arstechnica.com/science/news/2009/03/lithium-breakthrough-could-charge-batteries-in-10-seconds.ars
>> The results are pretty astonishing. At low discharge rates, a cell
>> prepared from this material discharges completely to its theoretical limit
>> (~166mAh/g). As the authors put it, "Capacity retention of the material is
>> superior." Running it through 50 charge/discharge cycles revealed no
>> significant change in the total capacity of the battery.
>> But the truly surprising features of the cell came when the authors
>> tweaked the cathode to allow higher currents to be run into the cell.
>> Increasing the rate by a factor of 100 dropped the total capacity down to
>> about 110mAh/g, but increased the power rate by two orders of magnitude
>> (that's a hundred-fold increase) compared to traditional lithium batteries.
>> Amazingly, under these conditions, the charge capacity of the battery
>> actually increased as it underwent more charge/discharge cycles. Doubling
>> the charge transport from there cut the capacity in half, but again doubled
>> the power rate. At this top rate, the entire battery would discharge in as
>> little as nine seconds. That sort of performance had previously only been
>> achieved using supercapacitors.
> http://www.nytimes.com/2008/12/03/technology/start-ups/03hawaii.html?partner=rss
>  The State of Hawaii and the Hawaiian Electric Company on Tuesday endorsed
>> an effort to build an alternative transportation system based on electric
>> vehicles with swappable batteries and an “intelligent” battery recharging
>> network.
> http://mychargepoint.net/
> sdw
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