镍离子掺杂MnCO3负极材料的合成及其电化学性能研究OA

In recent years,transition metal carbonates have been considered as promising anode materials for lithium-ion batteries(LIBs)due to their ease of preparation and low cost.However,its cationic radius is small which resulting in strong cationic polarization and their poor structural stability and rate perform-ance have hindered the full realization of their high-performance capabilities.In this study,based on MnCO3,a bimetallic carbonates strategy was employed to incorporate nickel metal ions(x=0.2,0.25,0.5)in MnCO3 using a simple solvothermal method and NixMn1-xCO3(x=0.2,0.25,0.5)materials were synthesized.The structure and morphology of the synthesized NixMn1-xCO3 materials were charac-terized using X-ray diffraction,X-ray photoelectron spectroscopy,and scanning electron microscopy.As anode materials for LIBs,the electrochemical performance of the as-prepared NixMn1-xCO3 materials were also investigated.The results indicate that the morphology of the NixMn1-xCO3 materials change with the incorporation of nickel ions.Bimetallic synergistic effect improves the electrochemical performance of the nickel-doped carbonate materials.When x is 0.25,the as-prepared Ni0.25Mn0.75CO3 material exhibits the smallest particle size and the best electrochemical performance.At a current density of 1 A/g,the Ni0.25Mn0.75CO3 electrode maintains a reversible specific capacity of 595 mA·h·g-1 after 500 cycles,demonstrating the superiority of the bimetallic carbonate strategy.This work provides theoretical evidence for the development of new inorganic carbonate-based anode materials for LIBs with high specific capacity and stable cycling performance.