Preparation and Rate Capability of Carbon Coated LiNi1/3Co1/3Mn1/3O2as Cathode Material in Lithium Ion Batteries

LiNi 1/3 Co 1/3 Mn 1/3 O 2 (NCM) is regarded as a promising material for next-generation lithium ion batteries due to the high capacity, but its practical applications are limited by the poor electronic conductivity. Here, a one-step method is used to prepare carbon coated LiNi 1/3 Co 1/3 Mn 1/3 O 2 (NCM/C) by applying active carbon as reaction matrix. TEM shows LiNi 1/3 Co 1/3 Mn 1/3 O 2 particles are homogeneously coated by carbon with a thickness about 10 nm. NCM/C delivers the discharge capacity of 191.2 mAh g –1 at 0.5 C (85 mA g –1 ) with a columbic efficiency of 91.1%. At 40 C (6800 mA g –1 ), the discharge capacity of NCM/C is 54.6 mAh g –1, whereas NCM prepared through sol–gel route only delivers 13.2 mAh g –1 . After 100 charge and discharge cycles at 1 C (170 mA g –1 ) the capacity retention is 90.3% for NCM/C, whereas it is only 72.4% for NCM. The superior charge/discharge performance of NCM/C owes much to the carbon coating layer, which is not only helpful to increase the electronic conductivity but also contributive to inhibit the side reactions between LiNi 1/3 Co 1/3 Mn 1/3 O 2 and the liquid electrolyte.