【作者】 周勇；

【导师】 刘恩辉；

【作者基本信息】 湘潭大学 ， 化学工程与技术， 2018， 硕士

【摘要】 能源的开发和利用关系到人们的生活方式和生活质量,传统能源的匮乏,环境、气候和健康问题迫切需要发展一场能源革命。因此,发展可持续的储能系统成为研究的重点。电化学储能(如电池)已被认为是最为广泛的可再生的绿色储能安全系统之一。本文制备出Ti掺杂BiOF、Bi掺杂TiO2两种电极材料,并应用于碱性二次电池和锂离子电池以研究其材料的电化学性能。本论文的主要内容如下:1.以Bi(NO3)3、NH4F、Ti(SO4)2为原料,氨水为沉淀剂,通过共沉淀法制备了 Ti掺杂BiOF电极材料。研究结果表明,采用共沉淀法合成的Ti-BiOF材料呈现花簇状结构,厚度约为10～30 nm,长度约为30～60 nm。将其与氢氧化镍材料组装成碱性二次电池,同时与纯BiOF料进行对比,在1 A g-1电流密度条件下BiOF、5%Ti-BiOF材料的比容量分别是141.6 mAh g-1、193 mAh g-1、500次循环后容量保持率分别是50%、78.8%。2.将制备好的BiOF、5%Ti-BiOF材料与金属锂片组装成锂离子半电池,研究了其电化学性能。电化学性能测试结果表明,5%Ti-BiOF材料有着更高的比容量(100 mA g-1的电流密度下循环50次后比容量是为304 mAh g-1,高于BiOF材料的190 mAh g-1),更好的倍率性能(BiOF和5%Ti-BiOF材料在30圈变倍率循环测试后,容量保持率分别是61%和81%)。3.采用Bi(N03)3、Ti(SO4)2为原料,通过水热法制备了 Bi掺杂Ti02材料。研究结果表明,采用水热法合成的Bi-TiO2材料呈现球状结构,粒径为80～400 nm。将2%Bi-TiO2与纯TiO2分别作为锂离子电池负极材料。100 mA g-1的电流密度下循环50次后,2%Bi-TiO2、TiO2比容量分别为250 mAh g-1、200mAh g-1,其容量保持率分别为75.3%、62.5%。更多还原

【Abstract】 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.更多还原