Title :
Cycling and low temperature performance of Li ion cells
Author :
Croft, Haiyan ; Staniewicz, Bob ; Smart, M.C. ; Ratnakumar, B.V.
Author_Institution :
SAFT America Res. & Dev. Center, Cockeysville, MD, USA
Abstract :
Lithium-ions cells, of DD and D size, are being developed under a contract with the USAF for NASA´s Mars Rover missions. The cells contain spirally wound electrodes of LiNiO2 positive electrode material and graphite anode in cylindrical stainless steel hardware. The electrolytes were selected based on the mission needs of good low temperature (-20°C) performance, combined with adequate stability at ambient temperature. The cells are being subjected to 100% DOD cycling at -20°C as well as at ambient temperature. In addition, the cells are being tested in 30% depth of discharge (DOD) low Earth orbit (LEG) regime and 60% DOD geosynchronous Earth orbit (GEO) regime. The cells have so far completed 5000 accelerated LEO cycles and about 500 accelerated GEO cycles. In this paper, the results of these on-going tests are presented
Keywords :
aerospace testing; anodes; cathodes; electrochemical electrodes; electrochemistry; electrolytes; graphite; life testing; lithium; lithium compounds; secondary cells; space vehicle power plants; -20 C; C; Li; Li-ion secondary cells; LiNiO2; LiNiO2 positive electrode; Mars Rover missions; NASA; accelerated testing; cycling performance; cylindrical stainless steel hardware; depth of discharge; electrolytes; geosynchronous Earth orbit; graphite anode; low Earth orbit; low-temperature performance; space power; Acceleration; Building materials; Contracts; Electrodes; Low earth orbit satellites; Mars; Temperature; Testing; US Department of Defense; Wounds;
Conference_Titel :
Energy Conversion Engineering Conference and Exhibit, 2000. (IECEC) 35th Intersociety
Conference_Location :
Las Vegas, NV
Print_ISBN :
1-56347-375-5
DOI :
10.1109/IECEC.2000.870849
