双金属有机框架材料在锂离子电池中的应用

发布时间：2018-04-13 02:35

本文选题：锂离子电池 + 负极　；参考：《华东师范大学》2017年硕士论文

【摘要】：锂离子电池是一种极为重要的储能手段,现已在我们的生产生活之中得到了极为广泛的应用。关于锂离子电池电极材料的开发吸引了大量研究者的关注。金属有机框架材料凭借其三维多孔结构、孔道尺寸灵活可调节以及金属中心和桥连配体多样性可替换等优点成为了一种极具开发前景的锂离子电池负极材料。我们在金属有机框架材料中引入双金属体系,获得了比单金属体系更为优异的性能。首先,我们在Mn-BTC单金属有机框架材料的基础上进行改进,向其中掺杂金属钴,合成了具有更高比容量以及更好的电化学稳定性的双金属有机框架材料MnCo-BTC。在文中通过各种表征及测试手段了解这一新材料的形貌结构、化学组成以及电化学性能。MnCo-BTC展现了极为优异的电化学性能,在100 mA·g-1的速率下进行充放电,150圈后仍然拥有901 mAh·g-1的性能。将充电速率增大到500 mA·g-1时,100次循环后容量仍可达到445.3 mAh·g-1。其次我们还研究了一个全新的双金属体系的有机框架材料——CoZn-BTC,并将其应用作为锂离子电池的负极。我们通过控制和筛选不同的投料比例、反应时间、以及是否进行热处理等条件,不断地对CoZn-BTC的性能进行优化。最后得到了在一定范围内的最佳合成条件,此时的CoZn-BTC在100 mA·g-1的充电速率下进行充放电测试,100次循环后仍然拥有994.7 mA·g-1的性能。
[Abstract]:The lithium ion battery is a very important means of energy storage, is now in our daily life has been widely used. The development of electrode materials for lithium ion batteries has attracted a lot of attention from researchers. The metal organic framework materials because of its porous structure, pore size adjustable and flexible metal center and the bridging ligand diversity can replace the advantages as cathode material of lithium ion battery, a great development prospects. We introduce the bimetallic system in metal organic framework materials, obtained more excellent performance than single metal system. First, we improved Mn-BTC based on single metal organic framework materials. To which, doped cobalt metal, with more specific capacity and better electrochemical stability of the double metal organic framework materials MnCo-BTC. and characterized by various testing methods in the synthesis of To understand the morphology and structure of the new material, the chemical composition and electrochemical properties of.MnCo-BTC show a very excellent electrochemical performance, charge and discharge at a rate of 100 mA - g-1, the performance after 150 laps still have 901 mAh - g-1. The charging rate increases to 500 mA - g-1, mAh - g-1. and 445.3 we also studied the organic framework material -- CoZn-BTC a new bimetallic system capacity could reach 100 cycles, and its application as anode of lithium ion battery. We can control and screening of different feed ratio, reaction time, and heat treatment conditions, constantly on the performance of CoZn-BTC optimized. Finally the optimum conditions in a certain range, the CoZn-BTC charge discharge test in the charging rate of 100 mA - g-1, the performance after 100 cycles still have 994.7 mA - g-1.

【学位授予单位】：华东师范大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM912

【参考文献】