Synthesis and characterization of LiNi_(0.45)Co_(0.10)Mn_(0.45)O_2 cathode for lithium ion batteries

摘要

LiNi_(0.45)Co_(0.10)Mn_(0.45)O_2 was prepared from Li_2 CO_3 and a triple oxide of nickel, cobalt and manganese at 950 deg C in air. The structure and characteristics of LiNi_(0.45)Co_(0.10)Mn_(0.45)O_2 were determined by XRD, SEM and electrochemical measurements. The compound LiNi_(0.45)Co_(0.10)Mn_(0.45)O_2 has layered structure with hexagonal lattice. The individual particles are agglomeration of many little primary particles whose size ranges from 100 mm to 200 nm. The LiNi_(0.45)Co_(0.10)Mn_(0.45)O_2 cathode has excellent electrochemical performances with large reversible specific capacity of 142. 5 mA centre dot h/g between 4. 25 V, and good capacity retention of 83. 20 percent after 450 charge/discharge cycles. Capacity of the battery increases with enhancement of charge voltage limit, and a specific discharge capacity of 175. 2 mA centre dot h/g is obtained when the charge voltage limit is fixed at 4. 45 V.