/"According to the researchers, this new simple aging formula takes into account only the factors shown to most influence lithium-ion battery aging by affecting growth of the SEI layer, which include state of charge, how often the battery charges/discharges completely, operating temperature, and current."/
The battery companies have for years understood that electrolyte additives make a huge difference in reactions at the SEI layer, strongly effecting lifecyles, especially at higher temperatures and voltages (remember the Dahn video where he showed data on this, with best performers being from battery companies using propreietary additives). Impossible to tell from the article if this "formula" explains much of anything. It may simply describe behaviour in terms of some external variables such as temperature and current as the article seems to indicate. This could be based on a fit to data on a particular chemistry, or they may have derived it from more basic principles. In the former case it would not say anything about the molecular mechanisms that give rise to such effects, and would only be fairly predictive of performance for the cell chemistry data to which it was fit. Different additives would give different results, and it would have no power in predicting these. Would be nice to know how the equations were derived. -- View this message in context: http://electric-vehicle-discussion-list.413529.n4.nabble.com/A-math-formula-can-model-li-ion-pack-aging-Pyrite-pack-tp4678722p4678762.html Sent from the Electric Vehicle Discussion List mailing list archive at Nabble.com. _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org Read EVAngel's EV News at http://evdl.org/evln/ Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA)
