Synthesis and Electrochemical Characterization of Nano-Sized LiMn_(1.5)Ni_(0.5)O_4 Cathode Materials for Lithium-Ion Batteries

摘要

Spinel LiMn_(1.5)Ni_(0.5)O_4 materials with different morphologies were prepared by solid-state reaction method using nano-sized Mn-Ni-O precursor powders. The effect of annealing temperature on the physical properties and electrochemical performance of the LiMn_(1.5)Ni_(0.5)O_4 cathode materials was investigated. As the annealing temperature was increased from 700 to 1000℃, the particle size distinctly increased. The nano-sized LiMn_(1.5)Ni_(0.5)O_4 powder obtained at 800℃ exhibited a high initial discharge capacity of 130 mA h g~(-1) and good rate capability. The LiMn_(1.5)Ni_(0.5)O_4 material annealed at higher temperature (1000℃) exhibited good cycling stability.