Three-dimensional nanostructured Co_(2)VO_(4)-decorated carbon nanotubes for sodium-ion battery anode materials

Since Co_(2)VO_(4) possesses a solid spinel structure and a high degree of stability,it has gained interest as a possible anode material for sodium-ion batteries.However,the application of this electrode material is still hampered by its poor electrical conductivity and severe volume expansion.Uniform Co_(2)VO_(4) nanoparticles(CVO)were grown on carbon nanotubes(CNTs)by a simple solvothermal method to form string-like conductive networks(CVO/CNTs).The flexible and highly conductive three-dimensional(3D)carbon nano tubes and small-sized CVO NPs can enhance the rapid transport of electrons,thereby enhancing the conductivity of the composite.String-like conductive network structures have a larger specific surface area,enhancing electron/ion transmission by fully contacting the electrolyte.The findings demonstrate the superior Na^(+)storing capability of the CVO/CNTs composite.The battery has a great rate performance(148.2 mAh·g^(-1)at 5 A·g^(-1))and outstanding long-term cycling performance(147.3 mAh·g^(-1)after 1000 cycles at 1A·g^(-1)).In high-rate,long-cycle sodium-ion batteries,CVO/CNTs composites offer a wide range of possible applications.