The Preparation Of Ti Doped BiOF?Bi Doped TiO₂ Materials And Studies For Their Electrochemical Performance

The development and utilization of energy is related to people's life style and quality of life.For a long time,the widespread use of traditional fossil fuels,such as coal,oil and natural gas,may lead to serious environmental,climate and health problems,which are not sustainable.Therefore,developing sustainable energy storage system has become the focus of research.Electrochemical energy storage(such as battery)has been considered to be one of the most widely used renewable energy storage systems.In this paper,two kinds of electrode materials,Ti doped BiOF and Bi doped TiO2,have been prepared,which are applied to alkaline rechargeable battery and lithium-ion batteries to study the electrochemical properties of the materials.The primary research of this paper are as follows:1.Ti doped bismuth oxide electrode materials were prepared by coprecipitation method using Bi(NO3)3,NH4F and Ti(SO4)2 as raw materials and ammonia as precipitant.The results show that the Ti-BiOF material synthesized by coprecipitation has a flower like structure with a thickness of 10-30nm and a length of 30?60nm.It was assembled into alkaline rechargeable battery with nickel hydroxide,and compared with pure BiOF.Under the condition of 1 A g-1 current density,the specific capacity of the BiOF material and the 5%Ti-BiOF material was 141.6 mAh g-1,193 mAh g-1,and a retention of 50%,78.8%after 500 cycles,respectively.2.The prepared BiOF,5%Ti-BiOF materials and lithium metal sheets were assembled into lithium ion half-cells,and their electrochemical properties were studied.Electrochemical performance test results show that 5%Ti-BiOF material has a higher specific capacity(specificity is 304 mAh g-1 after 50 cycles at a current density of 100 mA g-1,which is higher than 190 mAh g-1 of BiOF material.),better rate performance(BiOF and 5%Ti-BiOF material after 30 cycle variable rate test,the capacity retention rate is 61%,81%,respectively.).3.Bismuth doped titanium dioxide was prepared by hydrothermal method using Bi(NO3)3 and Ti(SO4)2 as raw materials.The results show that the Bi-TiO2 material synthesized by hydrothermal method has spherical structure and particle size is 80?400nm.2%Bi-TiO2 and pure TiO2 are respectively used as anode materials for lithium ion batteries.After 50 cycles of 100 mA g-1 current density,the specific capacity of 2%Bi-TiO2 and TiO2 is 250 mAh g-1 and 200 mAh g-1 respectively,and their capacity retention rates are 75.3%and 62.5%respectively.