It is not for some odd political or intellectual property issue that Li-ion are prevailing in the marketplace. And some of the formulations probably have more Ni in them than Li, but I don't know that is a fact. If it isn't true weight wise, it is probably true $-wise. Although LiFePO4 have no nickel, the aluminium and copper foil are worth considerably more than the Li or electrolyte content.
With the right management methods Li-ion have very long cycle life - I used 2000 cycles because it is common on spec sheets. Spec sheets for LI-ion batteries made in China just plain suck. I tried and couldn't find out anything about test procedures used, Maybe because I am just a Harry Homeowner and have no real clout, but I also have the impression that many manufacturers and resellers there simply have no clue themselves. In reality Li-ion for larger format cells is still a tiny industry. LFP seems particularly easy to make and that invites knock off manufacturing. Here is a quote from WIKI FWIW: - 100% DOD <http://en.wikipedia.org/wiki/Depth_of_discharge> cycle life (number of cycles to 80% of original capacity) = 2,000–7,000[14] <http://en.wikipedia.org/wiki/Lithium_iron_phosphate_battery#cite_note-14> - 90% DOD <http://en.wikipedia.org/wiki/Depth_of_discharge> cycle life (number of cycles to 80% of original capacity) > 10,000 [15] <http://en.wikipedia.org/wiki/Lithium_iron_phosphate_battery#cite_note-Winston-GWL-Zyklentest-15> There are references, but I have not tracked them. On Wed, Sep 10, 2014 at 10:12 PM, Michael Ross <michael.e.r...@gmail.com> wrote: > LFP I know about, and they can provide more than 2000 cycles if you make > the same sort of effort as one does with Lead. Charge them right, don't > run them too low, ask too much of them when they are cold, etc. You can > ruin any battery. There is a loss of capacity if LFP just sit, of maybe 1% > a year (I am reflecting some stuff I saw on EVTV), number of cycles does > not degrade. I make a distinction between the aging/degradation and misuse. > > On Wed, Sep 10, 2014 at 8:34 PM, Jan Steinman via EV <ev@lists.evdl.org> > wrote: > >> > From: Bill Dube via EV <ev@lists.evdl.org> >> > >> > NiMH has been largely eclipsed by Li-Ion. >> >> Except in lifetime. Nickel technology is 3,000+ charge/discharge cycles >> if well cared for, Li-ion what, 1,000 max? And nickel cells have about the >> same capacity until they seriously break, whereas Li-ions "degrade," no? >> >> :::: You can't solve a problem with the same kind of thinking that >> created it in the first place. -- Albert Einstein >> :::: Jan Steinman, EcoReality Co-op :::: >> >> _______________________________________________ >> UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub >> http://lists.evdl.org/listinfo.cgi/ev-evdl.org >> For EV drag racing discussion, please use NEDRA ( >> http://groups.yahoo.com/group/NEDRA) >> >> > > > -- > Put this question to yourself: should I use everyone else to attain > happiness, or should I help others gain happiness? > *Dalai Lama * > > Tell me what it is you plan to do > With your one wild and precious life? > Mary Oliver, "The summer day." > > To invent, you need a good imagination and a pile of junk. > Thomas A. Edison > <http://www.brainyquote.com/quotes/quotes/t/thomasaed125362.html> > > A public-opinion poll is no substitute for thought. > *Warren Buffet* > > Michael E. Ross > (919) 550-2430 Land > (919) 576-0824 <https://www.google.com/voice/b/0?pli=1#phones> Google > Phone > (919) 631-1451 Cell > (919) 513-0418 Desk > > michael.e.r...@gmail.com > <michael.e.r...@gmail.com> > > > -- Put this question to yourself: should I use everyone else to attain happiness, or should I help others gain happiness? *Dalai Lama * Tell me what it is you plan to do With your one wild and precious life? Mary Oliver, "The summer day." To invent, you need a good imagination and a pile of junk. Thomas A. Edison <http://www.brainyquote.com/quotes/quotes/t/thomasaed125362.html> A public-opinion poll is no substitute for thought. *Warren Buffet* Michael E. Ross (919) 550-2430 Land (919) 576-0824 <https://www.google.com/voice/b/0?pli=1#phones> Google Phone (919) 631-1451 Cell (919) 513-0418 Desk michael.e.r...@gmail.com <michael.e.r...@gmail.com> -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20140912/06c0468e/attachment.htm> _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org For EV drag racing discussion, please use NEDRA (http://groups.yahoo.com/group/NEDRA)
