Li(Ni0.40Mn0.40Co0.15Al0.05)O2: A promising positive electrode material for high-power and safe lithium-ion batteries

摘要

Li1.11(Ni0.40Mn0.39Co0.16Al0.05)0.89O2 was synthesized through coprecipitation of a mixed hydroxide followed by calcination with LiOHH2O during lOh at 500 C and 950'C. Electrochemical tests and their comparison with those obtained for an industrial Li(Ni1_y_zCoyAlz)O2 material reveal that Li1.11(Ni0.40Mn0.39Co0.16Al0.05)0.89O2 shows good charge-discharge performance, even at high rate according to a protocol well established by car-makers for testing power abilities of batteries for electric and hybrid electric vehicles. In addition, this material shows a significant improvement in thermal stability in the highly deintercalated state (charged state of the battery) over the industrial material. Equivalent (or higher) energy and power densities with a significantly greater thermal stability make of Li1,11i(Ni0.40Mn0.39Co0.16Al0.05)0.89O2 an interesting candidate as positive electrode material for large lithium-ion batteries.