Preparation And Lithium Storage Properties Of MOFs-Based Bimetal Oxide Anode Materials

Lithium ion batteries developed in the 20th century as a new type of energy storage system.With the continuous improvement of social needs,the application of lithium ion batteries has become more and more extensive,so the requirements for performance have increased accordingly.Metal organic framework materials,which have attracted the attention of researchers,show excellent lithium storage properties when they are used as electrode materials.The ZnO/ZnFe₂O₄,ZnO/Co₃O₄/C,MnO/Mn Fe₂O₄ and CoFe₂O₄composite materials were prepared by liquid phase synthesis method and room temperature co-precipitation method,and the structure and lithium storage properties of the four electrode materials were characterized by SEM,XRD,cycle performance,rate performance and cyclic voltammetry.The ZnO/ZnFe₂O₄ composite exhibits such excellent lithium storage properties,which mainly relies on the cubic structure and the synergistic effect of the bimetal and its components,which can effectively alleviate the volume expansion of the material.When the current density is 100 m A·g^-1,the discharge specific capacity of ZnO/ZnFe₂O₄ still has 863m A·h·g^-1 after 100 cycles.The ZnO/Co₃O₄/C composite has a unique hollow structure which improves the transfer ability of electrons and ions.In addition,the synergistic effect of ZnO,Co₃O₄ and the carbon skeleton makes the ZnO/Co₃O₄/C exhibit excellent lithium storage properties.It has a discharge specific capacity of 1316 m A·h·g^-1 after 100 cycles at 100 m A·g^-1.The MnO/Mn Fe₂O₄ electrode material exhibits excellent lithium storage properties,which mainly because of its unique cubic structure and synergistic effect between multiple components.When the current density is 100 m A·g^-1,the discharge specific capacity of MnO/Mn Fe₂O₄ still has 898 m A·h·g^-1 after 100 cycles.CoFe₂O₄ exhibits excellent lithium storage properties,which mainly because of its unique cubic structure and synergistic effect of bimetal.When the current density is 100m A·g^-1,the discharge specific capacity of CoFe₂O₄ still has 932 m A·h·g^-1 after 100 cycles.Figure 53;Table 2;Reference 101.