Yes, about electric vehicles. Since it appears that Li-ion can catch
fire from impact of physical damage I'm not sure I'd want to drive a car
with a trunk full of Li-ion batteries. But maybe that's no worse than a
big tank of gasoline.
Chuck Norcutt
Tim Hughes wrote:
> Chuck,
> Yes the capacity is lower than Li-ion, but has many other advantages :
>
> Low self discharge rate so similar to the Hybrid niMH (Eneloops),can leave on
> shelf for a month or
> two and still has most of capacity without recharge.
> High rate capability so much better for high power aplications like cars and
> power tools.
> (For example the small cells I put into the Metz can produce 70A
> continuously. )
> Can fully recharge in 10mins,means you don't need to have multiple batteries
> for many purposes.
> Very good Cycle life >1000
> easier to charge.
> Long shelf life, (many years unlike Li-ion which are 2-3years)
> Non combustible electrolyte and no li metal formed unbound( even if abused
> unlike Li-ion
> etc.),does not burn easily and does not explode.
> Even though the high rate is not that important for Metz (The flash draws
> about 12A pk) the
> impedance is low and constant so capacity is independent of usage pattern
> unlike SLA.
> There are two different technologies used for LiFePO4 cells, one uses
> microparticle and are
> capable of very much higher currents. Curently these are being used in some
> new Dewalt power
> tools. There is a huge patent war brewing on who owns the technology. The big
> application is going
> to be in Electric Vehicles and hybrid vehicles.
>
>
> Tim Hughes
>
> --- Chuck Norcutt <chucknorcutt@xxxxxxxxxxxxxxxx> wrote:
>
>> I've never heard of lithium iron phosphate batteries before but located
>> this MIT tech blurb on the web. According to the article Li-FePO
>> batteries have about 1/2 the capacity of Li-ion cells. I assume your
>> comment about increasing the number of full dumps is relative to SLA cells?
>> <http://www.technologyreview.com/read_article.aspx?id=17362>
>>
>> Chuck Norcutt
>>
>> Tim Hughes wrote:
>>> The Lithium-ion and regular Lithium rechargeables are extremely flammable,
>>> but the new
>> generation
>>> of high power LiFePO4 cells are not, but I am sure the TSA is not going to
>>> differentiate!
>>>
>>> I have just converted one of my Metz CT60 flashes to Li-FePO4 and it cut
>>> the weight by about
>>> 1.5lbs and actually increases the number of full dumps. Charge time with an
>>> external charger
>> is
>>> 15minutes, this really is a huge improvement over the normal sealed Lead
>>> acids.
>>>
>>> Tim Hughes
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