Elimination of cobalt will be a big deal. Hope they find a way to eliminate nickel, too.
- Mark Sent from my Fuel Cell powered iPhone > On Sep 23, 2020, at 7:28 AM, Peri Hartman via EV <[email protected]> wrote: > > Lots of news today on tesla's battery day. Here's one excerpt from wired: > https://www.wired.com/story/where-was-the-battery-at-teslas-battery-day/ > > Based on the digital mockups shown at the event, the new 4680 cell is a lot > different from the lithium-ion cells currently used in Teslas... The diameter > of the cylindrical cell is twice as wide, and it is 14 percent longer than > the largest batteries [tesla uses]. Altogether, that makes its volume about > six times greater... the larger form factor alone was enough to boost the > energy by five times, the power by six times, and the range of a car using > these batteries by 16 percent. > > Also some talk about removing cathode and anode tabs: > > But these tabs hobble the performance of the cells and make them more > difficult to produce. Manufacturers must use a specialized welding technique > to connect them to the foil current collectors, which results in wasted time > and material. Even worse, the tabs reduce the battery’s efficiency, because > electric current must travel the full length of the electrode to reach each > tab. ...the company laser-patterned existing foil current collectors so that > they can have dozens of connections to the electrode materials. The result is > a current collector that Baglino described as a “shingled spiral” that looks > a bit like a curled-up, copper-plated armadillo. “The distance the electron > has to travel is much less,” Musk said. > > And some talk about using silicone instead of graphite to increase energy > density by 20-40%. Apparently, that isn't "new" news. Tesla claims to have a > new way to incorporate silicon that doesn't expand over time. Also eliminate > cobalt. > > -------- > > So, I guess the "tabless" statement is the main takeaway - a more efficient > cell with basically the same chemistry. The first statement is confusing to > me: how can you have 5 times the energy but only gain 16% in range ? It could > be that the form factor, itself, increases the range by 16% and the other > numbers relate to the increases from all the other changes taken together. > > Wall street apparently expected more from all the hype over the last several > months. But, all in all, if Tesla can build what it announce, it does sound > pretty significant. While Tesla typically misses its deadlines, it typically > doesn't fail on meeting its goals. > > Peri > > > > << Want to know about the effects of leaf blowers ? > https://quietcleanseattle.org/ >> > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: > <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20200923/0d087a58/attachment.html> > _______________________________________________ > UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub > ARCHIVE: http://www.evdl.org/archive/index.html > INFO: http://lists.evdl.org/listinfo.cgi/ev-evdl.org > Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA) > > _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub ARCHIVE: http://www.evdl.org/archive/index.html INFO: http://lists.evdl.org/listinfo.cgi/ev-evdl.org Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA)
