Composite oxide containing lithum, nickel, cobalt, manganese, and fluorine, process for producing the same, and lithium secondary cell employing it
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United States of America Patent
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Issued Date -
Mar 16, 2006
app pub date -
Jul 7, 2004
filing date -
Sep 16, 2003
priority date (Note) -
Abandoned
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Abstract
There is obtained an active material for a lithium secondary battery that has a wide usable voltage range, a high charge-discharge cycle durability, a high capacity and high safety and availability. The particles of a lithium-nickel-cobalt-manganese-fluorine-containing composite oxide having an R-3m rhombohedral structure represented by a general formula Li.sub.pNi.sub.xMn.sub.1-x-yCo.sub.yO.sub.2-qF.sub.q (where 0.98.ltoreq.p.ltoreq.1.07, 0.3.ltoreq.x.ltoreq.0.5, 0.1.ltoreq.y.ltoreq.0.38, and 0.ltoreq.q.ltoreq.0.05), and the particles of the lithium-nickel-cobalt-manganese-fluorine-containing composite oxide characterized in that the half-width of the diffraction peak of a (110) plane whose 2.theta. is 65.+-.0.5.degree. in the X-ray diffraction using a Cu--K.alpha. line is, 0.12 to 0.25.degree. are used as an active substance for a positive electrode.
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