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the work of yours truly in the spotlight http://www.greencarcongress.com/2015/06/20150601-trina.html

This paper brings significant knowledge to the li-air field. The end product of discharge is not li2o2 but lioh. Which means the radicals which were previously eating the electrolyte are now reacting with water in a stable manner. Grey's group shows 2000 cycles with a capacity of 1000 mah/g...

if you look at the demise of LiFePO4 vs the success of LiCoO2 based cathodes you could say that energy density is a very important (if not the most important) roadblock to be bypassed in the trek towards cheap EVs. LiFePO4 has around 2/3 the capacity of LiCoO2, similar voltage but is able to...

i would like to point out than steven chu, ex-secretary of dept of energy is co-authoring this paper. as i have also had to include "high level management" on previous papers for various reasons, i warn the readers to take the validity of the paper with a pinch of salt whenever politicians (or...

im not an engineer (as i would guess many of you are on this forum) but the general ideas put forward in this article are pretty common in the battery research field. if you attend various conferences where cutting edge research on batteries is presented, this is the kind of stuff you hear in...

"Elon R. Musk, the billionaire founder of PayPal and chief executive officer of the California-based car company Tesla Motors, took to an open-air stage in London recently for the U.K. launch of his new all-electric car, the Model S. During a rock-concert-like event he handed over the keys to...

So ORNL is a national lab. they dont commercialize anything. if there is anything worth it there there will be a spin-off company hoping to make it work. But the solid state lithium sulfur batteries did not garner that sort of interest. diffusion rates through the solid state electrolyte are...

Toyota is a mega corporation. They spend R&D dollars on pretty much everything under the sun. I assume they like solid state because it does not use the flammable liquid electrolytes utilized in Li-ion while making use of the same anodes/cathodes. Thus they are inherently safer and do not...

batteries are electrochemical storage devices. i dont see any reference of electrochemistry here. which species gets reduced and/or oxidized?

so the expected battery capacity can be calculated based on the molecular weight of the active material in the electrode, the number of electrons transferred and Faradays constant. For example the commercial cathode for Li-ion is LiCoO2. It undergoes one electron reduction of Co(IV) to Co(III)...

the problem with flow batteries for auto use is an intrinsic low energy density because they utilize liquid electrodes. lets look for example at the commercial cathode for Li-ionbatteries, LiCoO2. the concentration of Co (the active metal which undergoes reversible reduction/oxidation in the...

steven visco, the CEO of polyplus said at a recent conference hosted by Argonne Ntl Labs that he expects to commercialize these lithium metal/flexible poly-ceramic separator/aqueous electrolyte/sulfur cathode in 4 years. i am not convinced but i am a fan of the sulfur cathode. sion power is...

at a recent conference hosted by one of our national labs, the director of JCESR said ( and i am paraphrasing): "... 5 years ago, i would have lost my shirt in a bet about how far Tesla would achieve with the current Li-ion battery technology ..." Just keep in mind he is leading this hub which...

"spontaneous" here is used in its thermodynamic sense. it means that a phenomenon occurs by itself, or it is bound to happen. also the author of the article misuses the word "trasnference rate". It is actually "transference number", as it is not a rate, but a fraction describing which mobile...

this technology has major inherent drawbacks (as well as promises). currently the degradation of battery components by superoxide radicals formed during charging hinders progress in the field. IBM was a leader in Li-air research but they recently announced they will "diversify" to Na-air. Other...

so aqueous electrolytes means you cannot go too high above the reduction potential of water. Typically the voltage of aqueous batteries are around or below 2V. So unless some new electrodes are being used which can compensate in capacity the loss in voltage (currently commercial Li-ion batteries...

http://en.wikipedia.org/wiki/Abundance_of_elements_in_Earth's_crust Abundance of elements in Earth's crust

30 second charge guys? cmon this is a capacitor. thats 120C rate. energy density is probably low. cant do any serious solid state diffusion at these rates.

my understanding is that voltage does not affect the current loss. high voltage implies a lower current which in turn will result in a lower current loss because of the formula I^2R. according to my math above i dont see almost ANY current losses. why?

I love Li-air. However it will necessitate an open battery. Even with tetraglyme as solvent, and even if superoxide free-radical reactions are diminished enough (which i seriously doubt and expect a correction publication soon, just like the first time around) it will still evaporate over the...

Help me understand this then. The voltage of tesla roadster pack is 365 volts based on 99 cells in series operating at 3.7V each. 3.7V x 99 = 366.3V so i see no voltage drop which is in line with what we discussed above. For capacity however, there are 69 cells in parallele, supplying approx...

thank you arg. remember, C rate is up to the end user or designer engineer. the battery itself can achieve high rates without losing much capacity however. the whole advantage of capacity (without a major loss in voltage, ie 2V) is that you can use LOWER C rates to achieve the same power...

there is no information on any batterywith an air anode with performance anywhere close tobeing pushed into development. what is missing in every single caseis an electrolyte which allows metal deposition/dissolution for anextended number of cycles without being evaporated to air and...

When i envision energy density (E=V x Q, where Q is capacity) and power density (P=V x I) i immediately correlate the two by the discharge rate of the battery (C rate) for example if you discharge a material with an energy density of 50 Wh/kg at 1C (in 1 hour) it will deliver 50 W/kg. If the...

thank you for the reply. I guess my question is if I were to offer you a battery operated the 2 volts with af tcapacity of 150 to 200 Ah per kg. could u make a vehicle battery out of it? are there any fundamental red Flags with this battery for usage in high power applications is compared with...

thank you for the kind explanation. in my opinion if possible 1 would try to obtain all the cells in series. currently this is not possible because the driving range and the energy would not be enough coming from 1 single cell. so in theory if you have 4 * the capacity could per cell, than you...

im a chemist. so explain please

hi, i dont have an engineering background. could you please explain what a reduced voltage but a higher current mean for a high power battery pack like the roadsters? what dies the "balancing effort, etc" mean?

so if i understand correctly, if you double to cross sectional area of the wiring then you would experience the same loss you previously had but with double the current and half the voltage (given you take a hit in battery weight and cost) am i correct?

Sulfur is a great cathode. problem isit is not electronically nor ionically conductive so it has to becombined with conductive additives and gelated by solvents in orderto function as a cathode (which reduces the active material loadingin the cathode). the theoretical capacity of sulfur is 1670...

one problem with all solid could be cracking due to driving conditions (bumps in the road...)

well they didnt quite look at a battery, just a half cell. they had a Li/Li cell and were able to resolve dendrite formation in 3D by MRI while it is happening (in-situ) and also obtain NMR spectra of the event in situ as well. Now, whether the magnetic fields affect the test sample (battery of...

I have a primitive understanding of Joule Heating and I also understand P=IxV and the related equations based on V=IxR. However, i do not understand why in order to deliver a power of 213 kW (for the Roadster as an example) there are 99 batteries in series such that a voltage of 376V is used...