Layered lithium cobalt oxides free of localized cubic spinel-like structural phases and method of making same
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United States of America Patent
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Jul 8, 2003
Grant Date -
Feb 14, 2002
app pub date -
Sep 12, 2001
filing date -
Nov 13, 1998
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Abstract
A compound having the formula Li.sub..alpha. Co.sub..beta. A.sub..gamma. O.sub.2, is provided wherein A is one or more dopants having an average oxidation state N such that +2.5.ltoreq.N.ltoreq.+3.5, 0.90.ltoreq..alpha..ltoreq.1.10, .beta.>0, .gamma..gtoreq.0 and .beta.+.gamma.=1. The compound has a substantially single phase, hexagonal layered crystal structure and is substantially free of localized cubic spinel-like structural phases, wherein, in the powder x-ray diffraction pattern, there are no diffraction peaks at a smaller scattering angle than the diffraction peak corresponding to Miller indices.
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