A new anode material for room temperature sodium ion battery prepared by Nankai

Recently, Zhou Zhen, a professor from the school of materials science and engineering of Nankai University, led the team to make a breakthrough in the research of room temperature sodium ion battery cathode materials, to prepare a new type of carbon material Co doped with nitrogen and sulfur and calculate its mechanism of action The relevant research results were published in the top journal of materials science, advanced materials Carbon based materials have the best application prospects in many sodium ion battery anode materials The commercial anode material graphite for lithium-ion batteries shows low electrochemical capacity because of its small layer spacing and weak interaction with sodium ions, which hinders the insertion and storage of sodium ions, thus limiting its application in sodium ion batteries In order to solve this problem, the Zhou Zhen group used a simple and controllable method to realize the substitution of sulfur atoms for specific nitrogen atoms in nitrogen rich carbon sheets prepared by sol-gel method, and to obtain nitrogen and sulfur Co doped new carbon materials In this material, sulfur not only increases the distance between carbon layers and specific surface area, but also increases the site of sodium storage, so as to achieve the purpose of improving the capacity of sodium storage of carbon materials, so as to improve the battery capacity The mechanism of N-S co doping promoting the intercalation and migration of sodium ions between carbon layers was also revealed When it is used in the test of sodium ion battery, it shows high capacity and high capacity retention rate, and its comprehensive performance is higher than that of carbon materials with single nitrogen or sulfur doping and hard carbon materials with more research The material can realize the controllable addition of sulfur and form a stable structure, which effectively avoids the disadvantages of the reduction of cycle stability caused by the conversion to sodium sulfur battery during the charging and discharging process The results provide a feasible negative material solution for the practical application of sodium ion battery.