用于超级电容器的二氧化锰电极材料的制备及电化学特性研究..docx

用于超级电容器的二氧化锰电极材料的制备及电化学特性研究摘要超级电容器是一种介于电池和传统电容器之间的新型储能器件，具有比传统电容器更高的能量密度及比普通电池更高的功率密度和更长的循环寿命。随着高性能的电化学超级电容器在移动通讯、信息技术、航天航空和国防科技等领域的不断应用，超级电容器越来越受到人们的关注。超级电容器电极材料方面的研究将在一定程度上推进人类新型能源的开发和应用，缓解环境污染压力，提高人类社会的能量利用率，是非常有意义的研究工作。二氧化锰由于价格低廉、环境友好且电化学性能较好，被认为是一种非常有潜力的超级电容器电极材料。自1999年Lee和Goodenough率先合成并研究了纳米二氧化锰的电化学性能之后，超级电容器电极材料用纳米二氧化锰得到了深入研究。本论文采用水热法合成二氧化锰作为电化学电容器的电极材料，采用XRD、EIS、CV等多种现代物理测试手段和电化学研究方法研究了二氧化锰材料的制备、电容特性及各种影响因素。主要的研究内容如下:1、以硫酸锰为还原剂还原高锰酸钾的方法制备二氧化锰。2、用XRD表征手段来分析材料的微观形貌。3、利用循环伏安、恒流充放电和交流阻抗等方法对材料的电化学性能进行了表征。关键词：超级电容器，二氧化锰，电化学，比容量Abstract Asintermediate systems between conventional capacitors andbatteries,supercapacitorshave many advantages. While batterieshave higher energy densitythan supercapacitors, they deliver less power. Supercapacitors can store higher energydensity with lessdelivered power compared to conventional capacitors.Supercapacitors have achieved much attention in many fields, such asmobiletelecommunication,informationtechnology,consumerelectronics, aviationaerospace, military force and so on. Supercapacitors are attracting more andmore attention throughout the world. Promoting the development and application of new energy resource, alleviating thepressure of environmental pollution and improving the energy efficiency of humansociety, Research on supercapacitor electrode material is a very meaningful work.Becauseof itslowcost, environmental-friendly andgood electrochemicalperformance, manganese dioxide is considered to be avery promising electrode material for supercapacitor. Since the first work on synthesis and electrochemical properties of nano-manganese dioxide have been done by Lee and Goodenough in 1999, usingnano- manganese dioxide as electrode material of supercapacitor has been researched thoroughly.In this dissertation, we systemically research the electrochemical of the inexpensive manganese dioxide as the electrode materials of electrochemical capacitors.XRD, EIS, CV andelectrochemical methods have been used to analyze material preparat