For Electrochemical Lithium Storage And Catalytic Metal Oxygen(Sulfur)Preparation And Properties Of Nanometer Structure Research

One of the most important concerns in the 21 st century can be said to be clean and reliable energy suppling.It is closely related with our daily life,the global environment,economy and human health.With the rapid development of the IT industry,the practical application of the energy storage device indicators continue to improve.With the rapid growth in the number of mobile information devices,the current design capacity of the battery has gradually failed to meet the needs of practical applications.With the increasingly serious environmental pollution and energy crisis,development and application of new energy is becoming more important.However,because of the intermittent and uncontrollable shortcomings,most of the natural world which could directly provide clean energy such as solar energy,wind energy,is unable to provide a stable supply of energy.Within the scope of popularity of the electric vehicle and and portable electronic products stimulate the energy storage device to the development of the higher energy density and power density.As the critical part of lithium ion batteries,electrode is an important composition determing the battery performance.But the electrode material is a critical part of the electrode.As a traditional commercial lithium ion battery cathode material of carbon anode materials,because of low theoretical capacity?372 mAh/g?,it can not satisfy the demand for the requirements of high-energy,high-power.Tradition metal oxygen?sulfur?nanostructure materials have high specific capacity,high safety performance,low price and the advantages of rich natural reserve.Duing to the particular of traditional metallic oxygen?sulfur?nanostructure materials,it is an alternative material of traditional commercial carbon anode material.And its catalytic performance is excellent.However the traditional metallic oxygen?sulfur?nanostructure materials are easy pulverization and low efficiency in the field of lithium storage and catalysis.Therefore the research for electrochemical lithium storage and catalysis of nanometer materials is of great significance.This paper mainly studies the tradition metals such as copper,cobalt,titanium zinc oxide?sulfur?compound,Cu₃V₂O₇?OH?₂·2H₂O ?CoFe₂O₄?Ti+Sn?ZnCoS system for lithium storage and catalytic.?1?I constructed a 3D flower structure with 2D Cu₃V₂O₇?OH?₂·2H₂O nanosheets by sacrificing Cu₂O template.In the synthesis process,the cube box Cu₂O not only as a template but also provides a Cu source.The morphology and structure of Cu₃V₂O₇?OH?₂·2H₂O are shown by XRD,TEM and SEM.The composite structure of Cu₃V₂O₇?OH?₂·2H₂O shows its advantages in electrochemical performance.In the lithium ion storage Cu₃V₂O₇?OH?₂·2H₂O provides a high effective surface area and greatly shorten the migration path of lithium ions,that is,electrolyte in the lithium ion battery electrode material path.Therefore,the nanoscale Cu₃V₂O₇?OH?₂·2H₂O has a high capacity,stable cycle performance,especially up to 91.3% of the initial Coulomb efficiency,making it a lithium ion battery promising anode material.?2?The mesoporous octahedral Co Fe2O4 was synthesized by simple sol-gel method as the lithium ion anode material.According to the literature,it is known that the anisotropic octahedral structure has a good structural advantage for lithium ion battery electrode materials.The mesoporous structure can shorten the Li+/electron diffusion propagation path,buffer volume change,and increase the contact area of the electrolyte and the active material.Based on the combined advantages of porous structure,anisotropic octahedral structure and multi-component effect,CoFe₂O₄ achieves good electrochemical lithium storage,especially high capacity?992 mAhg-1 after 0.1 A/g 200 laps?and long cycle life?circulated at 5 A/g for 3000 cycles?.More important,after the cycle of 100 cycles,we removed the electrode,the electrode material scanning electron microscopy test,detected the octahedral CoFe₂O₄ structure is basically the same,with good stability.?3?I have synthesized the SnO₂ and TiO₂ adjacent nanocrystalline materials through reasonable design as the advanced lithium ion battery anode material.Because TiO₂ has no volume change,it is used as a structural framework for stabilizing adjacent SnO₂ nanoparticles with large volume changes,thus solving the shortcomings of the electrode material to be easily pulverized to improve the cycling stability of the electrode material.The high theoretical SnO₂ ensures high capacity for composite anode materials.Based on the combination of superiority selection and reasonable structural design,the current sample improves the electrochemical anode performance,including high capacity,good cycle stability,especially high magnification performance?434mAh/g of specific capacity after more than 500 cycles at 1A/g?.making it a lithium ion battery promising anode material.?4?The ZnCoSnanofrism were synthesized by hydrothermal method as hydrogen evolution catalyst and lithium ion battery anode materials.Based on the precursor ZnS?en?0.5,ZnCoSnanofrism with more active sites were synthesized,wich had relatively low initial overpotential and relatively high cathodic currents for catalytic hydrogen evolution,and the catalytic efficiency was high catalytic materials.