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+y wherein 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 = i.Pcl; yi = Si.Pc2; the vector Si is the x-ray spectrum for the LiwCo1-xAxO2+y compound; the vectors Pcl and Pc2 defining the principal component space are determined by measuring the x-ray powder diffraction values Si between 15 DEG and 120 DEG using a 0.02 DEG step size and CuK alpha rays for a large sample set of lithium cobalt oxides and using the regression of Si of 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 xi and yi values for LiwCo1-xAxO2+y compounds in the sample set that have a capacity fade after 50 cycles of less than or equal to 15 %.
申请公布号
WO0142141(A1)
申请公布日期
2001.06.14
申请号
WO2000US33137
申请日期
2000.12.07
申请人
FMC CORPORATION;YAKOVLEVA, MARINA;GAO, YUAN;BURBA, JOHN, L., III;ENGEL, JOHN, F.
发明人
YAKOVLEVA, MARINA;GAO, YUAN;BURBA, JOHN, L., III;ENGEL, JOHN, F.