Positive active material for non-aqueous electrolyte secondary battery and non-aqueous electrolyte secondary battery comprising same
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United States of America Patent
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May 17, 2005
Grant Date -
Jul 4, 2002
app pub date -
Nov 8, 2001
filing date -
Nov 14, 2000
priority date (Note) -
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Abstract
A positive active material for a non-aqueous electrolyte secondary battery includes a lithium-nickel composite oxide represented by the compositional formula LiaNi1-b-cCObMncO2 (a≦1.09, 0.05≦b≦0.35, 0.15≦c≦0.35, and 0.25≦b+c≦0.55). By X-ray diffractometry with a CuKα ray, the lithium-nickel composite oxide exhibits an intensity ratio R ((I012+I006)/I101) of not greater than 0.50, wherein R is the ratio of the sum of the diffraction peak intensity I012 on the 012 plane and the diffraction peak intensity I006 on the 006 plane to the diffraction peak intensity I101 on the 101 plane. The crystallinity of the positive active material of the compositional formula LiaNi1-b-cCobMncO2 can be kept high and it is possible to secure good capacity density and cycle life performance.
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