Preparation of LiNi0.5Mn0.5O2 cathode materials by urea hydrolysis coprecipitation

Layered LiNi0.5Mn0.5O2 has been successfully synthesized via urea hydrolysis coprecipitation method. Well-crystallized LiNi0.5Mn0.5O2 was obtained after calcinations of coprecipitation precursors and lithium salts at 450 degrees C for 3 h and following 900 degrees C for 10 h in air. Both the precursors and LiNi0.5Mn0.5O2 powders show an agglomerated secondary structure with crystalline particles inside. The quasi-spherical morphology of the precursors was maintained during the calcinations. The first charge and discharge capacities of as-prepared LiNi0.5Mn0.5O2 were 200 and 165mAh/g respectively. The discharge capacity of about 160mAh/g was retained after 10cycles for as-prepared samples. (C) 2010 Elsevier B.V. All rights reserved.