Research On Preparation Of TiO₂?B?/Ag Nanocomposites For Electrochemical Properties

Since titanium dioxide has been found to be useful for lithium ion battery anode material,its natural reserves are rich,simple preparation,pollution-free,low cost has become a hot research.But its reversible specific capacity is low,the magnification of the performance is poor so that the focus of the study by changing its morphology,and metal elements to be complex to obtain stable morphology of the composite material research.In this paper,TiO₂?B? nanostructured composites were prepared by hydrothermal method by exploring the preparation method of bronze crystalline titania?Ti O2?B??.Thereby improving the cycle performance and magnification performance of lithium-ion batteries.The main research contents are as follows:?1?Ti O2?B?nanowires materials were prepared by hydrothermal method using P25?anatase?and sodium hydroxide solution as raw materials.The effects of hydrothermal reaction temperature and time on the morphology and storage properties of the product were studied.And its microstructure was characterized as well as electrochemical performance test.The results show that the crystal form of the obtained titanium dioxide has changed with the increase of the hydrothermal reaction temperature.When the hydrothermal reaction temperature is 120 ?,the interconnected lamellar anatase is prepared.When the hydrothermal reaction temperature is 120?,the interconnected lamellar anatase is prepared.When the reaction temperature rose to 150 ? and 180 degrees,nanocrystalline bronze crystalline titanium dioxide?Ti O2?B??was prepared.Electrochemical tests show that the initial discharge capacity of anatase and two sets of Ti O2?B?materials is 232.15 m Ah/g,207.339 m Ah/g,respectively,at a current density of 33.5m A/g?0.1C?216.161 m Ah/g.The discharge capacity of the three groups after 29 cycles was 29.9 m Ah/g,116.824 m Ah/g and 83.2 m Ah/g,respectively.?2?TiO₂?B? nanostructured composites were prepared by hydrothermal method.The effects of Ag on the energy storage properties of lithium ion batteries were studied.The microstructural characterization and electrochemical performance of the composites were tested.The results show that TiO₂?B? nanocrystalline composites have higher specific capacity than pure Ti O2?B?.The specific capacity of the composites obtained by hydrothermal reaction at 180? reached 286.369 m Ah/g at the first charge and discharge,which was much higher than that of pure Ti O2?B?for the first time of 216.1m Ah/g.After 50 cycles,the discharge specific capacity of 126.5m Ah/g,still higher than pure Ti O2?B?95.21 m Ah/g discharge specific capacity.It is proved that the composite Ag does not affect the morphology of the product.Although the specific capacity of the Ti O2?B?material is improved,the magnification performance of the material can not be improved effectively.