Study On High Performance Cathode Material Of Zinc Ion Battery With Defective Vanadium Oxide

As the demand for renewable energy continues to grow,the rapid development of electronic energy storage systems has attracted widespread attention.For decades,lithium-ion batteries have dominated the energy field,but their poor safety and high cost have greatly restricted their large-scale applications.Since the metallic zinc anode has good electrochemical reversibility in the aqueous electrolyte,the rechargeable water-based zinc ion battery has attracted much attention.Vanadium-based electrode materials stand out among many electrode materials due to their diverse element valence states and large theoretical capacity.However,vanadium-based oxide electrode materials are still facing many problems in order to achieve major breakthroughs,such as the low conductivity of oxides,which greatly limits the development of vanadium-based oxide electrode materials.Therefore,it is necessary to explore more effective improvement methods to improve the performance of vanadium based electrode materials.In this paper,vanadium-based oxides were used as the research object,and two materials were successfully prepared with defect-type vanadium oxide nano-scrolls and defect-type vanadium oxide nanorods/graphene coaxial nano-rolls,and they were used as electrode materials.For water-based zinc-ion batteries,the sample materials had been studied through a number of characterization and electrochemical performance tests.Firstly,two steps of hydrothermal treatment and high-temperature calcination were used to prepare the defective vanadium oxide nano-scroll material.Through XPS,SEM,TEM and other characterization analysis,it was shown that the nano-volume material had the characteristics of large shell space structure and rich defect structure.The electrode material was made into a water-based zinc-ion battery.Comparative analysis shows that the nano-roll material had high energy/power density,stable long-term cycle performance and high reliability.It can be used as a cathode material for high-performance zinc-ion batteries.Secondly,finding energy devices with better performance was still a major problem in current research.However,in addition to improving the performance of the electrode materials in structure,the performance of vanadium-based oxide electrode materials can also be improved from other perspectives by combining with a variety of optimization methods.For this reason,we successfully prepared defective vanadium oxide nanorods/graphene coaxial nanovolumes.Through XPS,SEM,TEM and other characterization analysis,it was shown that the material was a coaxial nanovolume with a core-shell structure,and had a unique structure with a highly conductive graphene shell,a one-dimensional active material and structural defects.The electrochemical performance test shows that the electrical conductivity,ion diffusion ability and electrochemical performance of the material were significantly better than the reference sample,and it had fast discharge capability and excellent deep cycle stability.This experimental work had improved the performance of vanadium-based oxides and also promoted the development of zinc-ion batteries.