锂—空气电池用多孔催化剂的制备及表征

发布时间：2018-05-27 01:21

本文选题：锂-空气电池 + VXC-72　；参考：《天津工业大学》2017年硕士论文

【摘要】：近年来智能服装成为服装领域研究和开发的热点,将电子元件与普通服装相结合的方式是服装智能化最常用的手段。目前,智能服装内的电子元件所需的能源主要来自外加电池,而一般的电池具有续航时间短、重量大、能量密度小等缺点,严重影响了智能服装的发展,因此开发一种长续航、轻便、能量密度大的电池成为电子智能服装面临的首要问题。锂-空气电池(Li-air)作为一种新型的电化学能源储存装置,理论上具有超高能量密度,受到研究人员的广泛关注。在实用化之前,锂-空气电池仍然存在许多难题亟需解决。本文针对目前锂-空气电池阴极催化剂中存在的问题,制备了两种多孔催化剂,并得到如下结果:(1)利用静电纺丝技术,以高锰酸钾、聚丙烯腈(PAN)和聚甲基丙烯酸甲酯(PMMA)为原料,制备多孔MnOx/CNFs。结果表明当PAN:PMMA=2:1时,碳纤维的比表面积最大,为908.982m2/g;相比商用的VXC-72,以MnOx/CNFs为阴极催化剂得到的锂-空气电池首次放电平台较高(2.71V),放电比容量在1906mAh/g左右。(2)先对VXC-72进行氧等离子改性处理,后采用溶胶凝胶法合成了具有多孔结构的复合物ATO/CB。结果表明,对比于纯VXC-72电极,ATO/CB复合催化剂体系的锂-空气电池的首次放电平台在2.75V,高于VXC-72的2.62V放电平台。在0.2mA/cm2电流密度下,ATO/CB催化剂的锂-空气电池放电容量达到了1756mAh/g。
[Abstract]:In recent years, intelligent clothing has become a hot spot in the field of clothing research and development. The combination of electronic components and ordinary clothing is the most commonly used means of clothing intelligence. At present, the energy needed for electronic components in smart clothing mainly comes from external batteries, which have the disadvantages of short life span, high weight, low energy density and so on, which seriously affect the development of intelligent clothing. Therefore, the development of a kind of long battery life has been developed. Light, high energy density battery has become the most important problem of electronic intelligent clothing. As a new type of electrochemical energy storage device, Li-air (Li-Air) has been widely concerned by researchers for its high energy density in theory. Before application, lithium-air batteries still have many problems to be solved. In this paper, two kinds of porous catalysts have been prepared for lithium air battery cathodic catalysts. The results are as follows: 1. Using electrospinning technology, potassium permanganate, polyacrylonitrile (PAN) and polymethyl methacrylate (PMMA) as raw materials. Preparation of porous MnOx-CNFs. The results showed that when PAN:PMMA=2:1, the specific surface area of carbon fiber was 908.982 m2 / g. Compared with commercial VXC-72, the first discharge platform of lithium-air battery with MnOx/CNFs as cathode catalyst was 2.71 V ~ (-1) V ~ (-1), and the specific discharge capacity was about 1906mAh/g. The composite ATO / CB with porous structure was synthesized by sol-gel method. The results show that the first discharge platform of lithium-air battery is 2.75V, higher than that of VXC-72 (2.62V) compared with pure VXC-72 electrode / CB composite catalyst system. At the current density of 0.2mA/cm2, the discharge capacity of lithium-air cell over ATO / CB catalyst is 1756mAh/ g.
【学位授予单位】：天津工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM911.41

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