Synthesis and electrochemical performance of Li-rich xLi2MnO3?(1-x)LiMn1/3Ni1/3Co1/3O2 (x=0.2_0.5) cathode materials for lithium-ion batteries

Fourth interdisciplinary scientific forum with international participation "New materials and promising technologies"

Pechen, L.S.^1 ; Makhonina, E.V.^1 ; Rumyantsev, A.M.^2^3 ; Koshtyal, Yu M^2^3 ; Goloveshkin, A.S.^4 ; Volkov, V.V.^1 ; Politov, Yu A^1 ; Eremenko, I.L.^1

N.S. Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences, 31 Leninsky pr., Moscow

119991, Russia^1

Ioffe Institute, Russian Academy of Sciences, 26 Politekhnicheskaya, St Petersburg

194021, Russia^2

Peter the Great St. Petersburg Polytechnic University, 29 Polytechnicheskaya, St Petersburg

195251, Russia^3

Nesmeyanov Institute of Organoelement Compounds Russian Academy of Sciences, 28 Vavilova, Moscow

119334, Russia^4

关键词: Cath-ode materials;    Coprecipitation method;    Coulombic efficiency;    Cycling performance;    Discharge capacities;    Electrochemical performance;    Spherical particle;    Synthesis conditions;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/525/1/012042/pdf
DOI  :  10.1088/1757-899X/525/1/012042

来源: IOP

【 摘 要 】

Li-excess transition metal oxides of the general composition xLi2MnO3•(1-x)LiMO2 (M=MnaNibCoc, a+b+c=1) are synthesized by coprecipitation method. Synthesis conditions for obtaining spherical particles with porous structure were determined. The influence of the oxide phase composition on their electrochemical performance as cathode materials is studied in lithium half-cells. All the samples show very high first-cycle coulombic efficiencies (more than 90%) in the voltage range of 2.5-4.8 V at a current density of 0.5C. It is reported that the Li-rich oxide of the composition 0.35Li2MnO3•0.65LiMn1/3Ni1/3Co1/3O2 shows the better cycling performance in terms both discharge capacity and energy density and the best rate capability compared with the samples with larger and smaller contents of Li2MnO3.