Preparation of LiNi0.5Mn0.5O2 cathode materials by urea hydrolysis coprecipitation
Abstract Layered LiNi 0.5 Mn 0.5 O 2 has been successfully synthesized via urea hydrolysis coprecipitation method. Well-crystallized LiNi 0.5 Mn 0.5 O 2 was obtained after calcinations of coprecipitation precursors and lithium salts at 450 °C for 3 h and following 900 °C for 10 h in air. Both the precursors and LiNi 0.5 Mn 0.5 O 2 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 LiNi 0.5 Mn 0.5 O 2 were 200 and 165mAh/g respectively. The discharge capacity of about 160mAh/g was retained after 10cycles for as-prepared samples.