According to foreign media reports, a group of researchers led by Professor Pavel Troshin of the Skoltech Institute of Technology in Russia studied coordination polymers. The compound has little application in metal ion batteries, but the researchers showed The polymer has a high charge-discharge rate and high stability, and can be used in future energy storage equipment.
(Source: Skolkovo Institute of Technology official website)
Charge and discharge rate is one of the key characteristics of lithium ion batteries. Most modern commercial batteries require at least one hour to be fully charged, and the scope of application is greatly limited, especially for their use in electric vehicles. And the most commonly used anode material-graphite and other active materials as the charging speed increases, the capacity will significantly decrease. In order to maintain a high charge rate and maintain a high battery capacity, the active electrode material must have high electronic and ionic conductivity, and the newly discovered coordination polymer is composed of aromatic amines and transition metal salts such as nickel or copper. This requirement is being met. Despite the promising prospects of these compounds, researchers have not yet explored whether they can be applied to lithium-ion batteries.
Recently, a group of scientists led by Professor P. Troshin and the Russian Institute of Chemical Physics at the Skolkovo Institute of Science and Technology collaborated with the University of Cologne, Germany, and the Ural Federal University in Russia, focusing on the study of nickel and copper linearity based on tetraaminobenzene polymer. Although this linear polymer exhibits a lower initial electronic conductivity than two-dimensional competitors, it can be used as an anode material to complete charge and discharge in less than a minute, because lithium is doped in the first After the second discharge, its conductivity will increase sharply.
In addition, the researchers found that such anode materials have good stability at a high charge and discharge rate, and can retain up to 79% of their maximum capacity after as many as 20,000 charge and discharge cycles.
Moreover, the researchers also found that copper-based polymers can be used as both anodes and high-capacity cathode materials. The researchers pointed out that although the cathode cannot work in a stable manner, there are still many opportunities for structural optimization. Roman Kapaev, Ph.D. student at the Skolkovo Institute of Technology, said: "There are many ways to fine-tune the characteristics of the coordination polymer. In fact, we are working on a construction kit that can easily replace or change the polymerization. components in the composition, the amine structure may be changed, and transition metal cations may be changed so as to enhance the capacity, increasing or decreasing the redox potential to enhance the stability and various other properties. "(author: Yuqiu Yun)
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