Studies of Nanosized LiNi[sub 0.5]Mn[sub 0.5]O[sub 2]-Layered Compounds Produced by Self-Combustion Reaction as Cathodes for Lithium-Ion Batteries

Abstract

We report here on the synthesis of layered nanosized LiNi 0.5 Mn 0.5 O 2 compound by a modified self-combustion reaction and the studies of its electrochemical behavior as a cathode material for Li cells. Capacities up to 180-200 mAh/g could be reached during cycling of these electrodes even at 60°C in LiPF 6 /alkyl-carbonate solutions. The nano-LiNi 0.5 Mn 0.5 O 2 material exhibits remarkable stability during prolonged aging and cycling at elevated temperatures. Surface films developed on the nano-LiNi 0.5 Mn 0.5 O 2 particles in the course of cycling/aging contain polycarbonates, LiF, nickel and manganese oxides, and fluorides, and lead to efficient passivation and stabilization of the electrodes.