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From: hanson on 23 Jun 2010 16:43 in <http://groups.google.com/group/sci.physics/msg/e98bf317f804eeec> > Rich Delany wrote: [1] Battery technology is an active area of research, but an obvious question occurs to me: why is it, no one has determined [2] the maximum possible energy/volume, and energy/weight? [3] And from there, discover the chemistry which achieves it? [4] Is there some lacuna in our understanding of solid state physics [5] which necessitates an empirical, rather than theoretical approach> > hanson wrote: [1] yes --[2] E/vol = pressure limiat's given by the matl's scaling laws. [3] Electrochemistry is a mature science - [4] yes , always & ever. [5] Empirical/experimental work ALWAYS trumps theory. > As you said, this research field is enormously active. The chem <-> electric endeavors run from Fuel cells on the one side to Capacitors at the other. One of the most intriguing one is the Monolayer battery, so to speak a hybrid been a capacitor and an electrolyte free battery. In priciple like this: M1-E----M2: charge M1----E-M2: discharge M1-E----M2, where M1,2 are monolayers of different Metals and E is the mobile charge carrier like O, S, or Se. The principle is to use the electrons' different proximity or position at M1E vs M2E The potential of its fantastic energy/volume is enormous, but so are the problems to be overcome in this Nano technology field. IOW what's attempted here, in a way, is to use a variation of semiconductor technology as energy storage gizmos. > hanson --- news://freenews.netfront.net/ - complaints: news(a)netfront.net ---
From: Cydrome Leader on 23 Jun 2010 18:24
In sci.electronics.misc John Fields <jfields(a)austininstruments.com> wrote: > On Wed, 23 Jun 2010 15:56:11 +0000 (UTC), Cydrome Leader > <presence(a)MUNGEpanix.com> wrote: > >>In sci.electronics.misc John Fields <jfields(a)austininstruments.com> wrote: >>> On Tue, 22 Jun 2010 21:57:27 +0000 (UTC), Cydrome Leader >>> <presence(a)MUNGEpanix.com> wrote: >>> >>>>In sci.electronics.misc John Fields <jfields(a)austininstruments.com> wrote: >>>>> On Tue, 22 Jun 2010 01:33:12 +0000 (UTC), Cydrome Leader >>>>> <presence(a)MUNGEpanix.com> wrote: >>> >>>>>>>>Do you know if any companies still make large prismatic NiHM cells, in >>>>>>>>similar form factors to the flooded aircraft started NiCd batteries? >>>>>>> >>>>>>> --- >>>>>>> http://www.google.com/#hl=en&source=hp&q=large+prismatic+nimh+cells&aq=0&aqi=m1&aql=&oq=large+prismatic+NiHM+cells&gs_rfai=CEAOJYeUfTPLTAofAzQTJ9aHfDQAAAKoEBU_QshOL&fp=bff9aea6fcd663ae >>>>>> >>>>>>nothing relevent there. >>>>> >>>>> --- >>>>> >>>>> Checked all 120000 results, did you? >>>>> >>>>> BTW, what do you mean by "flooded aicraft started NiCd batteries"? >>>> >>>>here go over every result and tell me what you find >>>> >>>>http://www.google.com/#hl=en&q=aircraft+starting+battery+%2BNiCd+%2Bflooded&aq=f&aqi=&aql=&oq=&gs_rfai=&fp=d2eda4910a7445ea >>> >>> --- >>> Aww... poor baby doesn't want to do her own legwork? >>> >>> If you're serious in your quest, I suggest you go to: >>> >>> http://www.concordebattery.com/dealers.php >>> >>> and peruse the various dealers' web sites for what you want. >>> >>> Johm Fields >> >>that's a really clever idea, Johm. >> >>I'll call up a company that only make lead acid batteries to buy giant >>NiMh cells. > > --- > Well, darn. > > I guess you looked through that entire dealer list and couldn't find > even one that carries NiMH batteries? > > I would've looked for you, but it's not really my project, is it? > > Anyway I guess you missed the part on their home page where there's a > link to NiCd batteries that they supply lead-acid replacements for. > > Had you followed that link you most like likely would have found that > there's a company, SAFT, who make giant NiMH batteries, maybe even in > the form factor you're looking for. > > They're at: > > http://www.saftbatteries.com/ > > A link to their NiMH line is at: > > http://www.saftbatteries.com/Produit_NHP_329_51/Language/en-US/Default.aspx here we go. this is sort of what I'm asking about. |