Positive active material for lithium secondary battery and lithium secondary battery
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United States of America Patent
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Dec 29, 2015
Grant Date -
Feb 2, 2012
app pub date -
Jun 16, 2010
filing date -
Jun 24, 2009
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Abstract
The positive active material is a positive active material for a lithium secondary battery, including a lithium transition metal compound that has an olivine crystal structure and contains at least Ni, Fe, and Mn as transition metal elements, wherein when the sum of mole atoms of Ni, Fe, and Mn of transition metal elements contained in the lithium transition metal compound is expressed as 1, and the mole atomic ratios of Ni, Fe, and Mn are represented by a, b, and c (a+b+c=1, a>0, b>0, c>0), respectively, the following is satisfied: 0.85≦c≦0.92 and 0.3≦a/(a+b)≦0.9.
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