Influence of the composition on the electrochemical properties of cathode materials xLi2MnO3•(1–x)LiMn1/3Ni1/3Co1/3O2 for lithium-ion batteries

Resumo

Lithium-rich transition metal complex oxides of the general composition xLi₂MnO₃• •(1–x)LiMO₂ (M = Mn_aNi_bCo_c, a + b + c = 1) were synthesized by coprecipitation and modified Pechini method. The influence of the oxide phase composition on their electrochemical performance as cathode materials was studied in lithium half-cells. Effects of the synthetic approach and synthesis conditions on the morphology and electrochemical characteristics of the materials obtained were considered. The composition 0.35Li₂MnO₃• •0.65LiMn_1/3Ni_1/3Co_1/3O₂ demonstrates the highest discharge capacity retention during cycling. The samples with discharge capacity of 290 mA h g^–1 were obtained.