热电池用钒酸铜正极材料掺杂改性的研究

发布时间：2018-05-31 11:25

  本文选题：热电池 + 钒酸铜　； 参考：《沈阳理工大学》2017年硕士论文

【摘要】：热电池单体电池主要由负极、电解质和正极三部分组成。正极材料作为决定热电池性能的重要因素之一,研究和开发更高性能的正极材料是目前提高和发展热电池的有效途径和关键所在。钒酸铜正极材料由于其电子导电性较差,因此对该材料进行掺杂改性,提高其放电性能。本文通过溶胶凝胶法和沉淀法分别制备Mo掺杂Cu_3V_2O_8正极材料,通过溶胶凝胶法制备Mo掺杂Cu_5V_2O_(10)正极材料,采用XRD、SEM、DTA等分析手段对掺杂材料进行表征,采用粉末压片工艺制备单体电池,并研究了不同的合成条件等因素对单体电池放电性能的影响。结果表明,溶胶凝胶法合成的Mo掺杂Cu_3V_2O_8正极材料在掺Mo量为0.15、煅烧温度为700℃和煅烧时间为10h时放电性能最佳,此时制备的正极材料初始放电电压为2.8885V,截至2.0V时正极活性物质的比容量为225.2mAh/g。在正极材料中添加四元兼容电解质及导电剂可以提高其放电性能,实验表明,四元兼容电解质最佳添加量为35%,导电剂Ag的最佳添加量为10%。采用沉淀法合成Mo掺杂Cu_3V_2O_8正极材料在掺Mo量为0.15、沉淀液pH为7、煅烧温度为700℃和煅烧时间为10h时放电性能最佳,此时制备的正极材料放电电压可达2.75V,放电平台平稳,截止电压2.0V时正极活性物质的比容量为210m Ah/g。在该材料中电解质最佳添加量为25%,导电剂Ag的最佳添加量为10%。采用溶胶凝胶法合成的Mo掺杂Cu_5V_2O_(10)正极材料在掺Mo量为0.15、煅烧温度为750℃和煅烧时间为10h时放电性能最佳,此时制备的正极材料初始电压为2.8423V,截止2V时的正极活性物质比容量为229.5mAh/g。该材料中电解质最佳添加量为25%,导电剂Ag的最佳添加量为10%。掺Mo量要保持适合的值,过低和过高都不利于材料放电;煅烧温度对材料的放电性能有较大影响,煅烧温度越高反应越充分;煅烧时间对材料的放电性能影响不大。实验表明,溶胶凝胶法制备的正极材料放电性能较好。
[Abstract]:The single cell of thermal battery is mainly composed of negative electrode, electrolyte and positive electrode. As one of the important factors to determine the performance of thermal batteries, the research and development of cathode materials with higher performance is an effective way to improve and develop thermal batteries. Because of its poor electronic conductivity, copper vanadate cathode material was doped and modified to improve its discharge performance. In this paper, Mo-doped Cu_3V_2O_8 cathode materials were prepared by sol-gel method and precipitation method, and Mo doped Cu5VS2OD _ (10) cathode materials were prepared by sol-gel method. The doped materials were characterized by XRDD-SEMT-DTA and single cell was prepared by powder pressing process. The effect of different synthesis conditions on the discharge performance of single cell was studied. The results show that the Mo-doped Cu_3V_2O_8 cathode material synthesized by sol-gel method has the best discharge performance when Mo content is 0.15, calcination temperature is 700 鈩，

本文编号：1959468