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Waterproof Lithium-Air Batteries

Waterproof Lithium-Air Batteries - Forum Chimica

Waterproof Lithium-Air Batteries - Forum Scienza Chimica. Italian Chemistry Forum.


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Old 06-30-2009, 09:26 AM
Romeo Gigli
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Default Waterproof Lithium-Air Batteries



Questo sembra interessante, vorrei sapere che ne pensate

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"A company based in Berkeley, CA, is developing lightweight, high-energy
batteries that can use the surrounding air as a cathode. PolyPlus is
partnering with a manufacturing firm to develop single-use lithium metal-air
batteries for the government, and it expects these batteries to be on the
market within a few years. The company also has rechargeable lithium
metal-air batteries in the early stages of development that could eventually
power electric vehicles that can go for longer in between charges. "

"Lithium-metal batteries approach the energy density of fuel cells without
the plumbing needed for these devices; in theory, the maximum energy density
is more than 5,000 watt-hours per kilogram, or more than 10 times that of
today's lithium-ion batteries. Lithium metal-air batteries are also very
lightweight because it's not necessary to carry a second reactant. Lithium
metal is "the holy-grail battery material," says Steven Visco, chief
technical officer and founder of PolyPlus.
IBM recently announced that it would develop lithium metal-air batteries for
the energy grid and for transportation. "Lithium ion is the gold standard,
but what can beat it is lithium metal," says Paul Beach, president of
battery manufacturer Quallion of Sylmar, CA "



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Old 06-30-2009, 03:22 PM
Jack Malmostoso
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Default Waterproof Lithium-Air Batteries

On Tue, 30 Jun 2009 11:26:03 +0200, Romeo Gigli wrote:


Ma anche il coniglio mannaro [cit., quando la capite fate un fischio].

Una batteria Li-O2, come sistema primario, forse forse. E' parecchio
vantaggioso il fatto che il prodotto di scarica e' un sale insolubile
nell'elettrolita, quindi facilmente recuperabile e riciclabile.

Come secondario, e' molto appetibile sulla carta, ma ci sono ancora
moltissime incognite: una su tutte, nessuno sa di preciso quale sia il
meccanismo di scarica (Li2O? Li2O2? LiO2?). Questo comporta che nessuno
sappia di preciso quale sia il reagente limitante del sistema, e quindi
la scala usata per valutare le prestazioni (mAh/g di carbonio presente al
catodo) e' sostanzialmente senza senso.
Alcuni ricercatori hanno mostrato che il sistema e' reversibile usando
solo carbonio, altri dicono che un "catalizzatore" serve cmq. L'effetto
di questo catalizzatore e' tutto da capire.
Insomma, un sacco di domande senza risposta, al momento.

Esistono poi sistemi Li-O2 acquosi, che paiono funzionare benino anche
reversibilmente, ma chiaramente offrono un potenziale inferiore. Come
compromesso non sono da scartare, ecco.

--
Best Regards, Jack
Linux User #264449
Powered by Debian GNU/Linux on AMD64
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