Positive electrode active material powder for lithium secondary battery
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United States of America Patent
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Issued Date -
Oct 6, 2005
app pub date -
May 20, 2005
filing date -
Mar 14, 2003
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A lithium-nickel-cobalt-manganese composite oxide powder for a positive electrode of a lithium secondary battery, which has a large volume capacity density and high safety and is excellent in the charge and discharge cyclic durability, is presented. It is a lithium-nickel-cobalt-manganese composite oxide powder for a lithium secondary battery, represented by the formula Li.sub.pNi.sub.xCo.sub.yMn.sub.zM.sub.qO.sub.2-aF.sub.a (wherein M is a transition metal element other than Ni, Co or Mn, or an alkaline earth metal element, 0.9.ltoreq.p.ltoreq.1.1, 0.2.ltoreq.x.ltoreq.0.5, 0.1.ltoreq.y.ltoreq.0.4, 0.2.ltoreq.z.ltoreq.0.5, 0.ltoreq.q.ltoreq.0.05, 1.9.ltoreq.2-a.ltoreq.2.1, x+y+z+q=1, and 0.ltoreq.a.ltoreq.0.02). The lithium-nickel-cobalt-manganese composite oxide is an agglomerated granular composite oxide powder having an average particle size D50 of from 3 to 15 .mu.m, formed by agglomeration of many fine particles, and the compression breaking strength of the powder is at least 50 MPa.
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