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

摘要

LiNi0.45 Co0.10 Mn0.45O2 was prepared from Li2CO3 and a triple oxide of nickel, cobalt and manganese at 950℃ in air. The structure and characteristics of LiNi0.45 Co0.10 Mn0.45O2 were determined by XRD, SEM and electrochemical measurements. The compound LiNi0.45 Co0.10 Mn0.45O2 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 LiNi0.45 Co0.10 Mn0.45O2 cathode has excellent electrochemical performances with large reversible specific capacity of 142.5mA·h/g between 4.25V, and good capacity retention of 83.20% 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·h/g is obtained when the charge voltage limit is fixed at 4.45V.