soon. ;)
keskiviikko, 16. tammikuuta 2013 Kent Barnes <[email protected]> kirjoitti: > Okay, that worked. Great article....Holy s____t when will someone start > building them? > > > -----Original Message----- > From: [email protected] [mailto:[email protected]] On Behalf > Of robert winfield > Sent: Wednesday, January 16, 2013 9:44 AM > To: Electric Vehicle Discussion List > Subject: Re: [EVDL] Stanford researchers develop sulfur cathode,giving > Li-Ion 5 times higher energy density > > http://spectrum.ieee.org/nanoclast/semiconductors/nanotechnology/nanoparticl > e-enables-world-record-for-energy-storage-in-batteries > > Nanoparticle Enables World Record for Energy Storage in Batteries POSTED BY: > Dexter Johnson / Wed, January 09, 2013 > > Share on printShare on emailShare on facebookShare on twitterShare on > stumbleuponShare on linkedin Share on redditMore Sharing Services47 > > > > > > With just one week under our belts in this New Year, we already have some > world-record news in relation to lithium-ion (Li-ion) batteries and > nanoparticles. Researchers at Stanford University and the SLAC National > Accelerator Laboratory have developed a Li-ion battery in which its sulfur > cathode was capable of storing five times more energy than is possible with > today’s commercially available batteries. > The research—not surprisingly—was led by Stanford’s Yi Cui. What may be > somewhat surprising is that Cui has focused his attention in this research > on the cathode rather than the anode of the battery. Much of Cui’s most > recent work has been on improving the anodes of Li-ion batteries through the > use of nanostructured silicon. In this latest research, he has not only > shifted his attention to the cathode, but also developed an entirely new > material to do it. > The new material, which is described in the Jan. 8 edition of Nature > Communications (“Sulphur–TiO2 yolk–shell nanoarchitecture with internal void > space for long-cycle lithium–sulphur batteries”), is a nanoparticle that is > made up of an inner core of sulfur surrounded by an outer layer of porous > titanium-oxide. The nanoparticles architecture resembles that of the yolk > and shell of an egg. > > This nanoparticle’s new architecture has broken down an obstacle to using > sulfur in the cathode of Li-ion batteries that has persisted for around 20 > years. > While it has been known that sulfur could store more lithium ions than other > cathode materials, the combination of sulfur atoms with lithium ions > resulted in a compound—though necessary for the cathode to operate—that kept > dissolving and limited the storage capacity of the battery. Also, when the > lithium ions went into the cathode, it would expand the size of the cathode > by 80 percent. Attempts to employ protective coatings to correct the first > problem of the compound dissolving just resulted in them cracking as soon > the lithium ions expanded the cathode. > In the new architecture that Cui has developed, there is space between the > sulfur and the hard—but porous—titanium oxide. What this means is that the > sulfur-lithium intermediate compound does not dissolve because it is > protected by hard outer surface of the nanoparticle and the sulfur inside > has enough room to expand in the space between the core and the outer shell. > “It basically worked the first time we tried it,” Cui says in a press > release. “The sulfur cathode stored up to five times more energy per sulfur > weight than today’s commercial materials." > “After 1,000 charge/discharge cycles, our yolk-shell sulfur cathode had > retained about 70 percent of its energy-storage capacity. This is the > highest performing sulfur cathode in the world, as far as we know,” he said. > “Even without optimizing the design, this cathode cycle life is already on > par with commercial performance. This is a very important achievement for > the future of rechargeable batteries.” > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: > < http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20130116/3e79c632 > /attachment.htm> > _______________________________________________ > UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub > http://lists.evdl.org/listinfo.cgi/ev-evdl.org > For EV drag racing discussion, please use NEDRA > (http://groups.yahoo.com/group/NEDRA) > > > _______________________________________________ > UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub > http://lists.evdl.org/listinfo.cgi/ev-evdl.org > For EV drag racing discussion, please use NEDRA ( http://groups.yahoo.com/group/NEDRA) > > -- http://www.google.com/profiles/jarviju#about -------------- next part -------------- An HTML attachment was scrubbed... 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