The effect of composition in the lithium- and manganese-rich region of (Li₂MnO₃)_a(LiNiO₂)_b(LiMnO₂)_c(LiCoO₂)_d — where 0≤a≤0.83, 0.15≤b≤0.42, 0≤c≤0.85, and 0≤d≤0.30 (a + b + c + d = 1) — on the phase relations and the voltage fade phenomenon was probed using combinatorial synthesis methods.  The observed values of voltage fade indicated that it was not very sensitive to composition.  These values were found to be amenable to statistical modeling using the methods of Scheffé [1, 2].  The model indicated that it may be possible to markedly reduce voltage fade, but these potential compositions would be relatively low in lithium content and may not have the layered-layered structure.

The work at Argonne National Laboratory was performed under the auspices of the U.S. Department of Energy (DOE), Office of Vehicle Technologies, under Contract No.
DE-AC02-06CH11357. 

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