Nankai University prepares a new negative electrode material for room temperature sodium ion battery
Recently, Zhou Zhen, a professor at the School of Materials Science and Engineering at Nankai University, led a team to make breakthroughs in the research of anode materials for room temperature sodium ion batteries, and prepared new carbon materials co-doped with nitrogen and sulfur and calculated their mechanism of action.
Among the many anode materials for sodium ion batteries that attract attention, carbon-based materials have the best application prospects. The commercial anode material of lithium ion battery has a small interlayer spacing and weak interaction with sodium ions, which hinders the intercalation and storage of sodium ions, thus exhibiting lower electrochemical capacity and limiting its use in sodium ion batteries. In the application. In order to solve this problem, Zhou Zhen's group used a simple and controllable method to achieve a new carbon material in which a sulfur atom was substituted by a specific nitrogen atom in a nitrogen-rich carbon sheet prepared by a sol-gel method to obtain a nitrogen-sulfur co-doping. In this material, sulfur increases the distance between the carbon layer and the specific surface area, and also increases the sodium storage site, thereby jointly improving the storage capacity of the carbon material, thereby increasing the battery capacity.
The research team also revealed the mechanism of nitrogen-sulfur co-doping to promote the intercalation and migration of sodium ions between carbon layers. The material exhibits high capacity and high capacity retention when used in sodium ion battery testing, and its overall performance is higher than that of nitrogen or sulfur single doped carbon materials and the study of more hard carbon materials. The material can realize the controllable addition of sulfur, and can form a stable structure, effectively avoiding the disadvantage of reducing the cycle stability caused by conversion to the sodium-sulfur battery during charging and discharging. This achievement provides a viable negative electrode material solution for the practical use of sodium ion batteries.
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