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AssigneeCarnegie Mellon University
InventorsPrashant Nagesh Kumta, Chun-Chieh Chang, Mandyam Ammanjee Sriram
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Crystalline lithiated transition metal oxide materials having a rhombohedral R-3m crystal structure includes divalent cations selected and added in amounts so that all or a portion of the divalent cations occupy sites in transition metal atom layers within the materials' crystal lattice. The lithiated transition metal oxides are useful as cathode materials in lithium-ion secondary cells. The materials include, but are not limited to, Li.sub.1+x Ni.sub.1-y M.sub.y N.sub.x O.sub.2(1+x) and Li.sub.1 Ni.sub.1-y M.sub.y N.sub.x O.sub.p, wherein M is a transition metal selected from titanium, vanadium, chromium, manganese, iron, cobalt, and aluminum, and N is a group II element selected from magnesium, calcium, strontium, barium, and zinc. The materials provide improved cyclability and high voltage capacity as cathodes in lithium-ion secondary cells. Processes for producing the divalent cation-containing lithium transition metal oxide materials of the invention are also disclosed.
A crystalline material comprising atoms of lithium, oxygen, and at least one transition metal, the material further comprising divalent cations on sites within atom layers of the crystalline material including said atoms of said at least one transition metal.
A cathode for an electrochemical cell, the cathode comprising a crystalline material comprising atoms of lithium, oxygen, and at least one transition metal, said material further comprising divalent cations on sites within atom layers of said material including atoms of said at least one transition metal.
A lithium-ion secondary cell comprising:
A process for producing a lithium transition metal oxide crystalline material, the process comprising:
A process for producing a lithium-ion secondary cell, the process comprising fabricating the cell from:
Dependencies are inferred from the claim text.