Professor: Nyt flowbatteri har lovende fremtid

..... er der nogen derude, der ved hvordan det går med den teknik man skrev en del om for 3-4 år siden, der ville bruge et vædskebaseret energibæremedie, som så kunne transporteres - f.eks. fra solcelleanlæg i Sahara - og pumpes på bilerne('s "batterier") lidt ligesom kulbrinteprodukter, blot med den forskel at der her dannes et "udtømt" returprodukt, der skal "genoplades".?? Det lød lidt mere anvendeligt end ovenstående teknologi - hvis den første da vel at mærke stadig holder hvad man stillede os i udsigt.

Som jeg læser dit spørgsmål er det faktisk flow batterier du spørger til.

Problemet er at selvom der er sket store fremskridt med flow batterier er energitætheden stadig alt for lav til køretøjer, og tænkes derfor primært til energilagring i store stationære tanke.

se evt. http://en.wikipedia.org/wiki/Energy_density http://en.wikipedia.org/wiki/Flow_battery et hurtigt overslag giver at flow batterier har en energitæthed på ca 1/3 af Li-ion batterier.

Ja, man kan godt kalde det for et flowbatteri, i og med at der sker et vædskeflow igennem batteriet, Den teknik jeg tænkte på (jeg HAR fundet den efterfølgende), betegner opfinderne kun delvist som et flowbatteri, helt præcist et "alkylic-carbonate-electrolyte semi-solid lithium-ion flow battery", men efterfølgende har man valgt at fokusere forskningen i retning af andre (billigere) materialer end lithium.

Hej Micheal og Nis

Husk at energitætheden er langt større end ved energilagring i højde vandreservoirer i fx Norge.

»Optimalt skal flowbatteriet kunne holde til at cykle mange gange, gerne op imod 10.000. I dette projekt har man indtil videre kun forsøgt sig med at cykle relativt få gange,« konstaterer han.

Her står ellers at det kan holde til 5.000 ladecykler:

University of Southern California. (2014, June 25). Scientists create new battery that's cheap, clean, rechargeable ... and organic. ScienceDaily http://www.sciencedaily.com/releases/2014/... Citat: "... "The batteries last for about 5,000 recharge cycles, giving them an estimated 15-year lifespan," said Sri Narayan, professor of chemistry at the USC Dornsife College of Letters, Arts and Sciences ... "Such organic flow batteries will be game-changers for grid electrical energy storage in terms of simplicity, cost, reliability and sustainability," said Prakash. ..."

Harvard University. (2015, September 24). Green storage for green energy: Rechargeable battery to power a home from rooftop solar panels. ScienceDaily: http://www.sciencedaily.com/releases/2015/... Citat: "... In the operation of the battery, electrons are picked up and released by compounds composed of inexpensive, earth-abundant elements (carbon, oxygen, nitrogen, hydrogen, iron and potassium) dissolved in water. The compounds are non-toxic, non-flammable, and widely available, making them safer and cheaper than other battery systems. ... "We combined a common organic dye with an inexpensive food additive to increase our battery voltage by about 50 percent over our previous materials," says Gordon. The findings "deliver the first high-performance, non-flammable, non-toxic, non-corrosive, and low-cost chemicals for flow batteries." ... Their new battery, described in a paper published today in the journal Science, replaces bromine with a non-toxic and non-corrosive ion called ferrocyanide. ..."

Friedrich-Schiller-Universitaet Jena. (2015, October 21). Synthetic batteries for the energy revolution: Chemists present an innovative redox-flow battery based on organic polymers and water. ScienceDaily: http://www.sciencedaily.com/releases/2015/... Citat: "... In the redox-flow battery of the Jena scientists, on the other hand, novel synthetic materials are used: In their core structure they resemble Plexiglas and Styrofoam (polystyrene), but functional groups have been added enabling the material to accept or donate electrons. No aggressive acids are necessary anymore; the polymers rather 'swim' in an aqueous solution. "Thus we are able to use a simple and low-cost cellulose membrane and avoid poisonous and expensive materials," Tobias Janoschka, first author of the new study, explains. ... In first tests the redox-flow battery from Jena could withstand up to 10,000 charging cycles without losing a crucial amount of capacity. The energy density of the system presented in the study is ten watt-hours per liter. Yet, the scientists are already working on larger, more efficient systems. In addition to the fundamental research at the University, the chemists develop their system, within the framework of the start-up company JenaBatteries GmbH, towards marketable products. ..."

Så venter vi på at de bliver produceret og kommer på markedet. Mon de når det inden nettoordningen for mine solceller udløber

DOE/Pacific Northwest National Laboratory. (2015, December 21). New flow battery offers lower-cost energy storage: Organic battery will be cheaper than standard vanadium flow battery. ScienceDaily http://www.sciencedaily.com/releases/2015/... Citat: "... The organic aqueous flow battery, described in a paper published in the journal Advanced Energy Materials, is expected to cost $180 per kilowatt-hour once the technology is fully developed. The lower cost is due to the battery's active materials being inexpensive organic molecules, compared to the commodity metals used in today's flow batteries. ... PNNL's new flow battery features two main electrolytes: a methyl viologen anolyte (negative electrolyte) and a 4-hydroxy-2,2,6,6-tetramethylpiperidin-1-oxyl, or 4-HO-TEMPO catholyte (positive electrolyte). A third, supporting electrolyte carries sodium chloride, whose chloride ions enable the battery to discharge electricity by shuffling electrons in the central stack. ... To test the new battery design, Wang and his colleagues created a small, 600-milliwatt battery on a lab countertop. They repeatedly charged and then discharged the battery at various electric current densities, ranging from 20 to 100 milliAmperes per square centimeter. The test battery's optimal performance was between 40 and 50 milliAmperes per square centimeter, where about 70 percent of the battery's original voltage was retained. They also found the battery continued to operate well beyond 100 cycles. ..."

Nov 27, 2015, physicsworld.com: New high-capacity battery goes with the flow: Citat: "... Wang and colleagues have developed a new type of redox-flow battery in which the cathodic tank contains lithium–iron-phosphate granules and the anodic tank contains granules of titanium dioxide. ... When the battery is discharged, the reaction runs in reverse, returning the lithium to the cathode. Because the lithium is stored in solid form in both of the charged and discharged states of the battery, the energy density of the new lithium-flow battery is about 500 Wh/l. This is around 10 times that of a vanadium redox battery. ..." High–energy density nonaqueous all redox flow lithium battery enabled with a polymeric membrane: http://advances.sciencemag.org/content/1/1...