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U.S. Department of Energy
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Performance of the Sony lithium-ion rechargeable battery. Technical report, December 1991-December 1992

Technical Report ·
OSTI ID:7047720
Sony lithium-ion cells type 20500 were tested and evaluated at different temperatures, discharge rates from C/2 to 3C, and with different charge voltage cutoffs. The capacity was typical 0.8 Ah at the C/2 rate at 25 deg C when charged to 4.1-volt cutoff. An energy density of 70 Wh/kg and 400 or more cycles was demonstrated. Charging to 4.25 volts and higher cutoffs was tested without a safety problem. The Sony charger provided a constant potential charge at 8.2 volts (4.1 volts/cell). It replaces 90% of capacity within one hour and it shut off the charging after 2-1/2 hours.
Research Organization:
Army Research Lab., Fort Monmouth, NJ (United States)
OSTI ID:
7047720
Report Number(s):
AD-A-277076/6/XAB; ARL-TR--71
Country of Publication:
United States
Language:
English

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