Preparation and characterization of layered LiMn 1/3Ni 1/3Co 1/3O 2 as a cathode material by an oxalate co-precipitation method

Abstract

The layered LiMn 1/3Ni 1/3Co 1/3O 2 cathode materials were synthesized by an oxalate co-precipitation method using different starting materials of LiOH, LiNO 3, [Mn 1/3Ni 1/3Co 1/3]C 2O 4·2H 2O and [Mn 1/3Ni 1/3Co 1/3] 3O 4. The morphology, structural and electrochemical behavior were characterized by means of SEM, X-ray diffraction analysis and electrochemical charge–discharge test. The cathode material synthesized by using LiNO 3 and [Mn 1/3Ni 1/3Co 1/3]C 2O 4·2H 2O showed higher structural integrity and higher reversible capacity of 178.6 mAh g −1 in the voltage range 3.0–4.5 V versus Li with constant current density of 40 mA g −1 as well as lower irreversible capacity loss of 12.9% at initial cycle. The rate capability of the cathode was strongly influenced by particle size and specific surface area.