Synthesis, Structure, and Electrochemical Characteristics of Overlithiated Li[sub 1+x](Ni[sub z]Co[sub 1−2z]Mn[sub z])[sub 1−x]O[sub 2] (z=0.1–0.4 and x=0.0–0.1) Positive Electrodes Prepared by Spray-Drying Method

The effects of overlithiation on the structural modifications and cell performances of materials with different ratios of were investigated. We prepared the with a series of compositions of and by a spray-drying method. We found that the effects of overlithiation on cell performances may depend on the ratio; the discharge capacity of the overlithiated was more severely degraded than the stoichiometric with cyclings, whereas showed better capacity-retention ability and C-rate capability than those of because of decreasing structural disorder (cation mixing) by overlithiation. We also found that structural modifications of the synthesized materials during first charging were changed by overlithiation but mainly depended on the ratio.