Lithium secondary battery
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United States of America Patent
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Jul 20, 2004
Issued Date -
N/A
app pub date -
Jan 4, 2002
filing date -
Feb 5, 1999
priority date (Note) -
Expired
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Abstract
A lithium secondary battery using a lithium manganese oxide for a positive active material having a cubic spinel structure which has a crystallite size of 58 nm or greater and/or a lattice distortion of 0.09% or less. The ratio of Li/Mn in the lithium manganese oxide is preferably greater than 0.5. In synthesizing the lithium manganese oxide, a mixed compound including salts and/or oxides of each of the elements is fired in an oxidizing atmosphere in a range of 650.degree. C. to 1000.degree. C. for 5 to 50 hours, with the properties of the crystal being improved by firing two or more times, preferably with an increase in firing temperature over the temperature of the previous firing.
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