This newspaper (reporter Ren Zhaoxia).Recently, the team of Peng Huisheng and Wang Bingjie from the Institute of Fiber Electronic Materials and Devices, the Department of Polymer Science, the Advanced Materials Laboratory, and the State Key Laboratory of Polymer Molecular Engineering of Fudan University, together with Wang Yonggang, Zhou Haoshen, Lu Jun and other collaborators, created a new calcium-oxygen battery. The battery can be electrochemically charged and discharged at room temperature, and can run stably for 700 cycles, showing the advantages of high safety and low cost, and providing new ideas for the development of wearable battery fabrics. The results have been published in the main journal of Nature.
Calcium metal has the characteristics of low redox potential and multivalence, combined with China's abundant calcium resources, the battery system based on calcium metal has broad prospects in future energy applications. Among the calcium-based batteries, calcium-oxygen batteries have the highest theoretical energy density, but it is difficult to find an electrolyte that can match the calcium metal anode and adapt to the high electrode potential air cathode, which seriously restricts the development of calcium-oxygen batteries.
In order to accomplish this challenge, the Fudan research team successfully prepared a new electrolyte based on dimethyl sulfoxide ionic liquid by systematically designing the ratio of solvent, electrolyte salt and electrolyte, which effectively met the high requirements of the positive and negative electrodes of the battery, and constructed a new calcium-oxygen battery that can work at room temperature. According to the researchers, the newly created calcium-oxygen battery is mainly composed of three parts: a metal calcium anode, a carbon nanotube air cathode and an organic electrolyte. The battery design not only optimizes performance and cost, but also takes into account environmental sustainability and application requirements in flexible electronic devices. Among them, the metal calcium anode has a low cost and high theoretical capacity, and at the same time, the metal calcium can be further loaded on the flexible substrate to obtain a flexible metal calcium anode, which lays the foundation for the realization of flexible calcium-oxygen batteries. The new electrolyte exhibits high ionic conductivity at room temperature and exhibits stable electrochemical properties, significantly improving the overall safety of the battery.
China Education Daily, February 17, 2024, page 1
Author: Reporter Ren Zhaoxia.