Electrochemical Performance of Layer-Structured Ni 0.8 Co 0.1 Mn 0.1 O 2 Cathode Active Materials Synthesized by Carbonate Co-Precipitation.

The layered Ni-rich NiCoMn (NCM)-based cathode active material Li[Ni x Co (1-x)/2 Mn (1-x)/2 ]O 2 (x ≥ 0.6) has the advantages of high energy density and price competitiveness over an LiCoO 2 -based material. Additionally, NCM is beneficial in terms of its increasing reversible discharge capacity with the increase in Ni content; however, stable electrochemical performance has not been readily achieved because of the cation mixing that occurs during its synthesis. In this study, various layer-structured Li 1.0 [Ni 0.8 Co 0.1 Mn 0.1 ]O 2 materials were synthesized, and their electrochemical performances were investigated. A NiCoMnCO 3 precursor, prepared using carbonate co-precipitation with Li 2 CO 3 as the lithium source and having a sintering temperature of 850 °C, sintering time of 25 h, and metal to Li molar ratio of 1.00-1.05 were found to be the optimal parameters/conditions for the preparation of Li 1.0 [Ni 0.8 Co 0.1 Mn 0.1 ]O 2 . The material exhibited a discharge capacity of 160 mAhg -1 and capacity recovery rate of 95.56% (from a 5.0-0.1 C-rate).