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 todays commercially available batteries. The researchnot surprisinglywas led by Stanfords 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 Cuis 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 (SulphurTiO2 yolkshell nanoarchitecture with internal void space for long-cycle lithiumsulphur 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 nanoparticles 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 compoundthough necessary for the cathode to operatethat 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 hardbut poroustitanium 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 todays 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)
