GITT studies on oxide cathode LiNi_(1/3)Co_(1/3)Mn_(1/3)O_2 synthesized by citric acid assisted high-energy ball milling

摘要

Layered LiNi_(1/3)Co_(1/3)Mn_(1/3)O_2 was synthesized by a citric acid assisted solid-state method. The structure and electrochemical properties of the LiNi_(1/3)Co_(1/3)Mn_(1/3)O_2 materials were investigated. XRD analysis indicated the as-synthesized LiNi_(1/3)Co_(1/3)Mn_(1/3)O_2 was with the layered α-NaFeO_2 structure. The discharge capacity was about 154 m-Ahg~(-1) at 0.1 °C rate in the range of 2.0-4.5 V. The kinetics of the LiNi_(1/3)Co_(1/3)Mn_(1/3)O_2 materials was investigated by the galvanostatic intermittent titration technique (GITT) method. The lithium ion diffusion coefficient of the LiNi_(1/3)Co_(1/3)Mn_(1/3)O_2 was determined in the range of 10~(-8)-10~(-9) cm~2-s~(-1) as a function of voltage of 3.7-4.5 V.