• Li-Mn-rich cathode;
  • xLi2MnO3·(1-x)LiNi0.5Mn0.5O2;
  • spray pyrolysis;
  • high-energy;
  • Li-ion battery

Nanostructured lithium-manganese-rich nickel-manganese-oxide xLi2MnO3·(1-x)LiNi0.5Mn0.5O2 (0.3 ≤ x ≤ 0.6) composite materials were synthesized via spray pyrolysis using mixed nitrate precursors. All the materials showed a composite structure consisting of Li2MnO3 (C2/m) and LiNi0.5Mn0.5O2 inline image components, and the amount of Li2MnO3-phase appeared to increase with x, as observed from XRD analysis. These composite materials showed a high-discharge capacity of about 250 mAhg−1. In the range of x considered, the layered 0.5Li2MnO3·0.5LiNi0.5Mn0.5O2 materials displayed the highest capacity and superior cycle stability. Nonetheless, voltage suppression from a layered-spinel phase transition was observed for all the composites produced. This voltage suppression was dependent of the amount of Li2MnO3 phase present in the composite structure. © 2013 American Institute of Chemical Engineers AIChE J 60: 443–450, 2014