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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Aug 2, 2005
Grant Date -
Jun 27, 2002
app pub date -
Nov 5, 2001
filing date -
Nov 6, 2000
priority date (Note) -
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Abstract
A positive active material for non-aqueous electrolyte secondary battery is provided comprising lithium manganese oxide having such a spinel structure that the half-width (2θ) of the reflection peak corresponding to 440 plane as determined by X-ray diffractometry using CuKα ray is not greater than 0.145°. The use of this positive active material makes it possible to obtain a secondary battery which exhibits a good cycle life performance at room temperature and high temperatures and a reduced capacity drop when stored at high temperatures.
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