Method of producing layered lithium metal oxides free of localized cubic spinel-like structural phases
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United States of America Patent
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Sep 16, 2003
Grant Date -
Feb 7, 2002
app pub date -
Sep 12, 2001
filing date -
Nov 13, 1998
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Abstract
The present invention includes substantially single-phase lithium metal oxide compounds having hexagonal layered crystal structures that are substantially free of localized cubic spinel-like structural phases. The lithium metal oxides of the invention have the formula Li.sub..alpha. M.sub..beta. A.sub..gamma. O.sub.2, wherein M is one or more transition metals, 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, and .beta.+.gamma.=1. The present invention also includes dilithiated forms of these compounds, lithium and lithium-ion secondary batteries using these compounds as positive electrode materials, and methods of preparing these compounds.
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