> =A0From Elektor weekly news. > .lynkx?utm_source=3DUK&utm_medium=3Demail&utm_campaign=3Dnews> ____________ We'll see. _________ Full paper may be obtained here http://pubs.rsc.org/en/content/articlelanding/2011/jm/c1jm13535j free registration with RCS or academic etc login required. Claims are, as ever, suspect and it is far from friendly so far. Fluorine ions only known ion exchange electrolytes to date are solids. In notes below they claim potential of 10X LiIon capacities but paper says even theoretical capacity is lower than that. Cell has metal electrode and metal fluoride electrode and charges or discharges betwixt the two. Presently has massive capacity loss per cycle due to mechanical volume changes at electrode surface breakup Then has all the usual problems LiIon has for same reason. Needs a LiFePO4 type structure to save it. p17061 bottom left. Theoretical max capacity is 527 mAh/g of metal. That's probably one electro= de. Top capacity AA MimH is ~30g. Say 12g active material/electode to be kind. 12 gx 527 mAh/g ~=3D 6000 mAh in AA. Compared to 2500 mAh real now in AA with NimH. They then got 322 mAh /g actual on 1st cycle =3D 61% =3D~ 3600 mAh/AA and it deteriorated rapidly from there. Not looking good. My per gram per electrode above may be wrong. MAY be able to double those figures. Still not 10x LiIon. ie 12Ah/2,5Ah =3D 4.8 x NimH now or 9.6x IF you can double it. LiIon is slightly above best NimH at present. TBD Russell McMahon _________ http://www.energy-daily.com/reports/Fluoride_Shuttle_Increases_Storage_Capa= city_999.html A completely new concept for secondary batteries based on metal fluorides was developed by Dr. Maximilian Fichtner, Head of the Energy Storage Systems Group, and Dr. Munnangi Anji Reddy at the KIT Institute of Nanotechnology (INT). Metal fluorides may be applied as conversion materials in lithium-ion batte= ries. They also allow for lithium-free batteries with a fluoride-containing electrolyte, a metal anode, and metal fluoride cathode, which reach a much better storage capacity and possess improved safety properties. Instead of the lithium cation, the fluoride anion takes over charge transfer. At the cathode and anode, a metal fluoride is formed or reduced. "As several electrons per metal atom can be transferred, this concept allows to reach extraordinarily high energy densities - up to ten times as high as those of conventional lithium-ion batteries," explains Dr. Maximilian Fichtner. _____________________ --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .