开云体育One matter is that iron phosphate is not typically used in HT batteries.?-------- Original message -------- From: glennmhdk <glenn.mh.dk@...> Date: 2/19/23 1:21 PM (GMT-05:00) Subject: Re: [Yaesu-FT-60] Nickel-Based Batteries [consider LiFePO4 accumulator] NiMh packs, properly maintained: 1,000 discharge-charge cycles.Hello Clint Please read these pages or reports: A123Systems (now NEC): https://web.archive.org/web/20081003130605/http://www.rc-netbutik.dk/getdoc.asp?id=100&md5hash=9810C237586CF6B4325753101E37DAE1 Quote: "...
Curent test projecting excellent calendar life: 17% impedance growth and 23% capacity loss in 15 [fifteen!] years at 100% SOC[State-of-Charge], 60 deg. C ... [ side 6: ] Thermal runaway comparison A123 versus mixed oxides and manganese spinel ... [ side 7: ] Thermal runaway comparison A closer look ... Note the consistent, low-rate ramping of A123’s temperature, indicating no thermal runaway …" Press two times on "Thousands of Low Rate Cycles": 26650-M1-cell has now reached ca. 7.300 100% Depth-of-Discharge (DOD)! But the capacity has only fallen to 80% of it start capacity. SANDIA REPORT SAND2008-5583 Unlimited Release Printed September 2008 Selected Test Results from the LiFeBatt Iron Phosphate Li-ion Battery Thomas D. Hund and David Ingersoll Prepared by Sandia National Laboratories Albuquerque, New Mexico 87185 and Livermore, California: Quote: "...
Test results have indicated that the LiFeBatt battery technology can function up to a 10C discharge rate with minimal energy loss compared to the 1 h discharged rate (1C).?
...
The majority of the capacity loss occurred during the initial [!] 2,000 cycles, so it is projected that the LiFeBatt should PSOC cycle well beyond 8,394 cycles with less than 20% capacity loss.
...
[See graph pdf-page 23]
[ Read: 48% kapacity available at -30°C. ]
[ Read: 65% kapacity available at -20°C. ]
[ Read: 74% kapacity available at 0°C.? ]
....
3.8 Over Voltage/Charge Abuse Test In Figure 16 the events in an over charge/voltage abuse test are documented. Initially, as expected, the cell voltage increases quickly while being charged at 10 A, but then slowly increases after 4.7 V. The cell voltage slowly increases for about 30 minutes while the cell temperature continues to slowly rise to about 100 °C at which time cell voltage spikes to the maximum value of 12 V. At about 110 °C the cell vents liquid electrolyte without any fire or sparks and then open-circuits at 116 °C. After open-circuiting and a loss of electrolyte, the cell looses all voltage at 120 °C. The data acquisition shuts down due to a no voltage condition, but temperature is manually monitored until the cell reaches its maximum value at 160 °C about 20 minutes after the cell open-circuited. …" 11 March 2009 Lithium batteries charge ahead. Researchers demonstrate cells that can power up in seconds: Quote: "... That seemed to be the case for lithium iron phosphate (LiFePO4), a material that is used in the cathode of a small number of commercial batteries. But when Ceder and Kang did some calculations, they saw that the compound could theoretically do much better. Its crystal structure creates "perfectly sized tunnels for lithium to move through", says Ceder. "We saw that we could reach ridiculously fast charging rates." ... The authors helped the ions by coating the surface of the cathode with a thin layer of lithium phosphate glass, which is known to be an excellent lithium conductor. Testing their newly-coated cathode, they found that they could charge and discharge it in as little as 9 seconds. ..." |
