tag:blogger.com,1999:blog-13900197.post4502335777317595644..comments2023-10-15T05:20:00.675-06:00Comments on Entropy Production: Silicon Nanowires in Lithium BatteriesRobert McLeodhttp://www.blogger.com/profile/05270962906437456350noreply@blogger.comBlogger7125tag:blogger.com,1999:blog-13900197.post-5607196209701863782013-03-17T09:03:30.856-06:002013-03-17T09:03:30.856-06:00Hi Robert,
Usually I do not read article on blogs,...Hi Robert,<br />Usually I do not read article on blogs, but I would like to say that this write-up very pressured me to check out and do it! Your writing taste has been surprised me. Thank you, quite nice article. <br /><br />Merlen Hogg<br /><a href="http://www.th-service.no/hms/" rel="nofollow">skumming isolering</a>Anonymoushttps://www.blogger.com/profile/02919074554562455003noreply@blogger.comtag:blogger.com,1999:blog-13900197.post-61715274150377311582008-02-09T13:14:00.000-07:002008-02-09T13:14:00.000-07:00In most commercial Li ion batteries today, the pos...In most commercial Li ion batteries today, the positive and negative electrodes occupy about 55% and 35% of the solid volume. So even if the volume of the negative electrode is reduced to nearly zero by using Si nanowire, the capacity of the battery will increase by a factor of about 1.8, not 10 as claimed by some sources.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-13900197.post-7178718971160732642007-12-27T04:40:00.000-07:002007-12-27T04:40:00.000-07:00I read about this a week or so ago, I'm not sure w...I read about this a week or so ago, I'm not sure where (maybe on Nature itself indeed). I wouldn't say that the volume change in nanowire would be a problem perse. Mechnanics on such a small scale are very different from what we are used to on a larger scale.Rikhttps://www.blogger.com/profile/16399372941974942210noreply@blogger.comtag:blogger.com,1999:blog-13900197.post-65868391836122198562007-12-20T16:40:00.000-07:002007-12-20T16:40:00.000-07:00I'm afraid I have no real idea what proportion of ...I'm afraid I have no real idea what proportion of the volume in a battery the anode typically takes up. You would have to take some apart to make a guess at it.Robert McLeodhttps://www.blogger.com/profile/05270962906437456350noreply@blogger.comtag:blogger.com,1999:blog-13900197.post-22753414526100085402007-12-19T19:35:00.000-07:002007-12-19T19:35:00.000-07:00This is a great demostration. If it works, the pos...This is a great demostration. If it works, the possibility is endless. <BR/>For the small portable battery application, I still see a physical challenge for the apporach. Using Si nano-wire, it still swelling. 4 time of its size. Inside a portable battery, the space is confined and filled with hard(liquid) materials. The challenge is to design this battery structure to accomodate the volume change during charge cycle. <BR/>Robert, do you have any number we can use to estimate the significant of the volume change for a typical cell phone battery using Si-Nano-wire anode?Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-13900197.post-20202500960691638382007-12-19T17:33:00.000-07:002007-12-19T17:33:00.000-07:00They are both important results in their own fashi...They are both important results in their own fashion. I would expect it will take a number of years for each advance to find itself into production batteries. Integrating the two of them will take even more time. <BR/><BR/>One other factor that I didn't discuss is how physically tough they will be. These are basically cantilevered beams so they can break if you pass a shock wave through them (by say, dropping). I would be interested if they have determined the bulk density of this material, since the buoyancy of the electrolyte is important to guess how resistant they will be to shock damage.<BR/><BR/>On the safety front, since they are storing more energy in a smaller area, I doubt they would be any safer. I think the safety issue with lithium batteries is overblown anyway -- it's mostly a quality control problem with counterfeit cells.Robert McLeodhttps://www.blogger.com/profile/05270962906437456350noreply@blogger.comtag:blogger.com,1999:blog-13900197.post-18340421678878743202007-12-19T16:24:00.000-07:002007-12-19T16:24:00.000-07:00Wow Robert, I found your sodium ion post the other...Wow Robert, I found your sodium ion post the other day and was impressed by that one, but this one could be really incredible. <BR/><BR/>I'm no expert but it would seem to me that a battery with sodium-silicon chemistry would be just about ideal from a cost/resource standpoint. Both plentiful and cheap. Again, wow!<BR/><BR/>One other thing, isn't silicon less reactive than carbon? Wouldn't this sort of chemistry be safer too?Anonymousnoreply@blogger.com