Layered lithium metal oxides free of localized cubic spinel-like structural phases and methods of making same

摘要

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_alphaM_betaA_gammaO₂, wherein M is one or more transition metals, A is one or more dopants having an average oxidation state N such that +2.5<=N<=+3.5, 0.90<=alpha<=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.