Lithium cobalt oxides and methods of making same

Details Lithium cobalt oxides and methods of making same Lithium cobalt oxides and methods of making same

2005-08-23

2005-08-23

Kopec, Mark (Department: 1751)

Compositions

Electrically conductive or emissive compositions

Metal compound containing

C252S518100, C252S500000, C429S231300, C429S223000, C423S641000, C423S589000

Reexamination Certificate

active

06932922

ABSTRACT:
The present invention includes lithium cobalt oxides having hexagonal layered crystal structures and methods of making same. The lithium cobalt oxides of the invention have the formula LiwCo1−xAxO2+ywherein 0.96≦w≦1.05, 0≦x≦0.05, −0.02≦y≦0.02 and A is one or more dopants. The lithium cobalt oxides of the invention preferably have a position within the principal component space defined by the relationship axi+byi≦c, wherein xi={right arrow over (S)}i•{right arrow over (P)}c1; yi={right arrow over (S)}i•{right arrow over (P)}c2; the vector {right arrow over (S)}iis the x-ray spectrum for the LiwCo1−xAxO2+ycompound; the vectors {right arrow over (P)}c1and {right arrow over (P)}c2defining the principal component space are determined by measuring the x-ray powder diffraction values {right arrow over (S)}ibetween 15° and 120° using a 0.02° step size and CuKα rays for a large sample set of lithium cobalt oxides and using the regression of {right arrow over (S)}iof the sample set against the capacity fade after 50 cycles of a lithium coin cell that includes a lithium negative electrode and the lithium cobalt oxide as the positive electrode material and that is cycled between 3.0 and 4.3V at a constant current of C/3 during both charge and discharge cycles; and the values a, b and c are determined by using only the xiand yivalues for LiwCo1−xAxO2+ycompounds in the sample set that have a capacity fade after 50 cycles of less than or equal to 15%.

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