C - Chemistry – Metallurgy – 01 – G
Patent
C - Chemistry, Metallurgy
01
G
C01G 51/00 (2006.01) C01G 1/00 (2006.01) H01M 4/02 (2006.01) H01M 4/52 (2006.01) H01M 4/58 (2006.01) H01M 10/40 (2006.01)
Patent
CA 2350710
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. These are desirable compounds as the presence of cubic spinel-like structural phase is detrimental to battery performance and especially battery cycling. The present invention provides more consistent electrochemical performance and are structurally stable. The lithium metal oxides of the invention have the formula Li.alpha.M.beta.A.gamma.O2, 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 at lower temperatures.
La présente invention concerne des composés d'oxyde métallique de lithium sensiblement monophase présentant des structures cristallines en couches hexagonales sensiblement exemptes de phases structurelles spinelloïdes cubiques. La formule des oxydes de lithium métallique de l'invention est Li alpha M beta A gamma O2. M représente au moins un métal de transition. A représente au moins un dopant dont l'état d'oxydation moyen N est tel que +2,5 </= N </= +3,5. en outre, 0,90 </= alpha </= 1,10, et beta + gamma = 1. L'invention concerne également des formes délithiées de ces composés, des piles secondaires au lithium ou aux ions lithium utilisant ces composés comme matériau anodique, et enfin la préparation de ces composés.
Engel John F.
Gao Yuan
Wang Hugh H.
Yakovleva Marina
Fmc Corporation
Sim & Mcburney
Umicore
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