Lithium metal oxide electrodes for lithium cells and batteries
View Patent ↗A lithium metal oxide positive electrode for a non-aqueous lithium cell is disclosed. The cell is prepared in its initial discharged state and has a general formula xLiMO 2 .(1−x)Li 2 M′O 3 in which 0<x<1, and where M is one or more ion with an average trivalent oxidation state and with at least one ion being Mn or Ni, and where M′ is one or more ion with an average tetravalent oxidation state. Complete cells or batteries are disclosed with anode, cathode and electrolyte as are batteries of several cells connected in parallel or series or both.
1. A lithium metal oxide positive electrode for a non-aqueous lithium cell prepared in its initial discharged state having a general formula xLiMO 2 .(1−x) Li 2 M′O 3 in which 0<x<1, and where M is three or more ions including Mn, Co, and Ni with an average oxidation state of three, wherein the Mn:Ni:Co ratio is 1:1:1, M′ is one or more ions having an average oxidation state of four, with both the LiMO 2 and Li 2 M′O 3 components being layered, and the ratio of Li to M and M′ is greater than one and less than two.
2. The lithium metal oxide positive electrode according to claim 1 having a general formula xLiMn 1/3 Ni 1/3 Co 1/3 O 2 .(1−x)Li 2 MnO 3 .