Preparation And Lithium Storage Properties Of Zn/Co-ZIF-based Anode Materials

Lithium-ion batteries,as a form of energy source for chemical power supply,are one of the most widely used rechargeable batteries.With the increasing demand of human society for highperformance lithium-ion batteries,more attention has been paid to the development of high-specific energy electrode materials.As a new type of porous material,Metal-Organic Frameworks?MOFs?have attracted enormous attention in the field of electrochemical energy storage.The rhombic dodecahedron bimetallic MOFs who had smooth surface and regular morphology were prepared by room temperature co-precipitation reaction.The porous ZnO/Co₃O₄/CoO/Co composites,N-doped porous carbon and Co₃O₄/NiO/C composites were synthesized using bimetallic MOFs as precursor.The compositions and microstructure of the materials were characterized by Xray diffraction?XRD?and field-emission scanning electron microscopy?FE-SEM?.The lithium storage properties were studied by the cyclic voltammetry and the galvanostatic charge-discharge.The porous structure in ZnO/Co₃O₄/CoO/Co composites can shorten the transmission path of Li+and increase the contact area between the electrode and the electrolyte.In addition,it may make the most of its cooperative function of the active materials of each component so that the composite materials have the excellent performance in lithium storage.It demonstrates a reversible specific capacity of 972.6 mAh·g^-1 at 100 mA·g^-1 after 100 cycles in the range of 0.01?3.0 V.And it can be up to 702.1 mAh·g^-1 at 500 mA·g^-1 after 500 cycles.In porous carbon structure,nitrogen doping can increase the activity of the material,and the bimetal embedded in carbon matrix can improve the structural integrity of the material.As the anode material of lithium-ion battery,the Zn-Co/NPC-600 particles exhibit superior lithium storage capabilities.It demonstrates a high discharge capacity of 970.0 mAh·g^-1 at 100 mA·g^-1 after 100 cycles in the range of 0.01?3.0 V.And it can come to 813.5 mAh·g^-1 at 500 mA·g^-1 after 500 cycles.As the anode material of lithium-ion battery,Co₃O₄/NiO/C electrode shows the excellent lithium storage performance because of its excellent conductivity and the synergistic effect of Co₃O₄ and NiO.It demonstrates a reversible specific capacity of Co₃O₄/NiO/C is 1182.3 mAh·g^-1 after 100 cycles at100 mA·g^-1 in the range of 0.01?3.0 V.And it can reach 812.3 mAh·g^-1 at 500 mA·g^-1 after 500 cycles.Figure 52,Table 2,Reference 107...