Synthesis and Electrochemical Properties of Layered Structure LiNi_(0.5)Co_(0.25)Mn_(0.25)O_2 Cathode Material

摘要

Lithium ion (Li-ion) batteries are currently the energy source of choice for cell phones, laptops, and other mobile electronic devices due to their balance of high energy density with high power density compared to other electrochemical energy carriers. In the present study, mixed hydroxide method is used to prepare Li[Ni_(0.5)Co_(0.25)Mn_(0.25)]O_2 from the precursors and analyze qualitatively and studied the electrochemical properties. The XRD spectrum exhibited predominant (003) orientation at 2θ = 18.39° corresponding to hexagonal layered structure of R3m symmetry with evaluated lattice parameters are a= 2.84 A, c= 14.43 A. Raman measurements were performed to understand the microstructure and vibrational modes of the prepared sample. From the electrochemical (EC) studies an initial discharge capacity of about 140 mAhg~(-1) with good cyclic stability was observed for the prepared sample in the potential range0.0 -1.0V in aqueous medium.