1 mAh per gram is less that LiFePO4 which is around 1.5 mAh per gram Sent from my iPhone
> On Dec 28, 2019, at 9:29 PM, brucedp5 via EV <[email protected]> wrote: > > > > https://www.controleng.com/articles/aqueous-lithium-ion-battery-improves-safety/ > Aqueous Lithium-ion battery improves safety > DECEMBER 22, 2019 RENSSELAER POLYTECHNIC INSTITUTE (RPI) > > [image > https://www.controleng.com/wp-content/uploads/sites/2/2019/12/CTLx_WEB_IMG_Battery-1024x497.jpg > Courtesy: Chris Vavra, CFE Media > ] > > A team of engineers at Rensselaer Polytechnic Institute (RPI) have found > using aqueous electrolytes instead of the typical organic electrolytes for a > lithium-ion battery doesn't reduce power or overall performance. > > As the lithium-ion batteries that power most phones, laptops, and electric > vehicles become increasingly fast-charging and high-performing, they also > grow more expensive and flammable. > > A team of engineers at Rensselaer Polytechnic Institute (RPI) demonstrated > how they could — by using aqueous electrolytes instead of the typical > organic electrolytes — assemble a substantially safer, cost-efficient > battery that still performs well. > > Reprints > The inside of a battery contains two electrodes — an anode and a cathode. > These electrodes are immersed in a liquid electrolyte that conducts ions as > the battery charges and discharges. > > Aqueous electrolytes have been eyed for that role because of their > non-flammable nature and because, unlike non-aqueous electrolytes, they > aren’t sensitive to moisture in the manufacturing process, making them > easier to work with and less expensive. The biggest challenge with this > material has been maintaining performance. > > “If you apply too much voltage to water it electrolyzes, meaning the water > breaks up into hydrogen and oxygen,” said Nikhil Koratkar, an endowed chair > professor of mechanical, aerospace, and nuclear engineering at RPI. “This is > a problem because then you get outgassing, and the electrolyte is consumed. > So usually, this material has a very limited voltage window.” > > In this research, Koratkar and his team — which included Fudong Han, an > endowed chair assistant professor of mechanical, aerospace, and nuclear > engineering and Aniruddha Lakhnot, a doctoral student at Rensselaer — used a > special type of aqueous electrolyte known as a water-in-salt electrolyte, > which is less likely to electrolyze. > > For the cathode, the researchers used lithium manganese oxide, and for the > anode, they used niobium tungsten oxide — a complex oxide that Koratkar said > had not been explored in an aqueous battery before. > > “It turns out that niobium tungsten oxide is outstanding in terms of energy > stored per unit of volume,” Koratkar said. “Volumetrically, this was by far > the best result that we have seen in an aqueous lithium-ion battery.” > > The niobium tungsten oxide, he explained, is relatively heavy and dense. > That weight makes its energy storage based on mass about average, but the > dense-packing of niobium tungsten oxide particles in the electrode makes its > energy storage based on volume quite good. The crystal structure of this > material also has well-defined channels — or tunnels — that allow lithium > ions to diffuse quickly, meaning it can charge quickly. > > The combination of fast-charging capability and the ability to store a large > amount of charge per unit volume, Koratkar said, is rare in aqueous > batteries. > > Achieving that kind of performance, with a low cost and improved safety, has > practical implications. For emerging applications such as portable > electronics, electric vehicles, and grid storage, the ability to pack the > maximum amount of energy into a limited volume becomes critical. > [© controleng.com] > > > + > https://www.torquenews.com/8861/heres-how-far-electrify-america-charging-network-has-come > Here's How Far Electrify America's Charging Network Has Come > Dec 21 2019 Because of Electrify America's efforts, it is now possible for > 200-mile electric vehicles to ..... For those who own the Hyundai Kona > Electric or Kia Niro EV, Electrify ... > https://www.torquenews.com/sites/default/files/styles/news/public/chevy_bolt_ev_electrify_america_0.jpg?itok=WmNWaS1T > > > > > For EVLN EV-newswire posts use: > http://www.evdl.org/archive/ > > > {brucedp.neocities.org} > > -- > Sent from: http://electric-vehicle-discussion-list.413529.n4.nabble.com/ > _______________________________________________ > 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)
