Structure and electrical properties of lithium nickel manganese oxide (LiNi_(0.5)Mn_(0.5)O_2) prepared by P123 assisted hydrothermal route

摘要

Lithium nickel manganese oxide (LiNi_(0.5)Mn_(0.5)O_2) cathode material was prepared using the triblock polymer Pluronic (P123) as a capping agent by hydrothermal method. The XRD analysis shows the importance of preparation conditions to prepare phase pure LiNi_(0.5)Mn_(0.5)O_2 compound. FTIR and Raman analysis confirmed the layered hexagonal structure. SEM and particle size analysis show the presence of submicron sized particles and few percentages of nanosized particles as secondary distribution. The electrical conductivity of the compound LiNi_(0.5)Mn_(0.5)O_2 was measured by AC impedance and four-probe DC measurements and compared. The total electrical conductivity of the compoundwas found to be 2.4 × 10~(?6) S/cm. A mixed ionic and electronic conduction was observed from the transference number measurement.