Synthesis of Li2MnO3-like electrode materials by reaction in solutions

The nickel-manganese compounds were synthesized by redox reactions in aqueous solutions using potassium permanganate and nickel chloride at ambient temperature. Layered structured materials in Li-Ni-Mn-O system were synthesized by using the formed nickel-manganese compounds as a precursor for electrode materials to examine the electrochemical activity. X-ray diffraction patterns of the Li 2 MnO 3 -like Li 1.296 Ni 0.056 Mn 0.648 O 2 sample were indexed to a layered structure based on hexagonal α-NaFeO 2 with a superlattice existence indicating a monoclinic Li 2 MnO 3 crystalline phase. The electrode provides the initial discharge capacity of 108mAh/g and the maximum discharge capacity of 192mAh/g between 2.0 and 4.8 V versus Li/Li + at 0.2 mA/cm 2 .