Cu- and S-doped multielement composite Cu/Mn₃O₄@SC microspheres derived from bimetallic CuMn-MOF as anode materials for lithium-ion batteries

Microsphere 3D structure of Cu/Mn3O4@SC composite was fabricated by pyrolyzing the bimetallic CuMn-MOF, which was composed of Cu2+, Mn2+ and sulfur-containing ligand 2,5-thiophene dicarboxylic acid (H2TDC). The composite of Cu/Mn3O4@SC is used as a high-performance anode material for the lithium-ion batteries cycle exhibiting stable capacities of 715 mAh g(-1) after 100 cycles at 200 mA g(-1) and outstanding long cycle performance with a reversible capacity of 508 mAh g(-1) at 0.5 A g(-1) after 500 cycles. The superior performance for the Cu/Mn3O4@SC anode is mainly attributed to the mutual supporting characteristics of heterojunction synergistic effect, thus avoiding damage in the process of energy storage process. In addition, the kinetic analysis based on CV reveals that the transport kinetics mechanism of the Cu/Mn3O4@SC is synergistically controlled by the surface capacitive and pseudocapacitive behaviors. The EIS proves that the introduction of Cu enhances the conductivity of the material and the rate of lithium-ion diffusion.