Positive active material for rechargeable lithium batteries and method for preparing same
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United States of America Patent
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Jun 22, 2004
Grant Date -
Aug 15, 2002
app pub date -
Sep 25, 2001
filing date -
Sep 25, 2000
priority date (Note) -
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Abstract
Provided are a positive active material and a method of preparing for the same. The positive active material comprises a core and a surface-treatment layer on the core. The core includes at least one lithiated compound, and the surface-treatment layer includes at least one coating element-included oxide. The lithiated compound includes a secondary particle of which average particle size is larger than or equal to 1 .mu.m and less than 10 .mu.m. The secondary particle is formed of an agglomeration of small primary particles of an average size of 1 to 3 .mu.m in diameter. The positive active material is prepared by coating the lithiated compound with an organic solution or an aqueous solution including a coating-element source and heat-treating the coated compound.
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