A new cathode material for room temperature sodium

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Nankai University prepared a new negative electrode material for room temperature sodium ion batteries

recently, Professor Zhou Zhen of the school of materials science and engineering of Nankai University led the team to make a breakthrough in the research of negative electrode materials for room temperature sodium ion batteries, prepared a new carbon material mixed with nitrogen and sulfur, and calculated its action mechanism. This machine is used to test the test pieces of various hard materials

carbon based materials have the best application prospect among many cathode materials of sodium ion batteries that have attracted attention. Graphite, the cathode material of commercial lithium-ion batteries, shows low electrochemical capacity due to its small layer spacing and weak interaction with sodium ions, which hinders the insertion and storage of sodium ions, which limits its application in sodium ion batteries. In order to solve this problem, Zhou Zhen's research 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 obtained new carbon materials with nitrogen and sulfur co doping. In this material, sulfur not only increases the distance between carbon layers and specific surface area, but also increases the sodium storage sites, which jointly realizes the purpose of improving the sodium storage capacity of carbon materials, thereby improving the battery capacity

the research group also revealed the mechanism of nitrogen and sulfur co doping to promote the embedding and migration of sodium ions between the layers of carbon materials through calculations. When used in sodium ion battery testing, this material shows high capacity and high capacity retention, and its comprehensive performance is higher than that of nitrogen. It can eat or throw away all bags directly, or carbon materials doped with sulfur alone, as well as hard carbon materials with more research. The material can realize the controllable addition of sulfur, and can form a stable structure, which effectively avoids the disadvantages of reducing the cycle stability caused by the conversion to sodium sulfur battery in the process of charging and discharging. This achievement provides 5. 5% for the practical application of sodium ion battery A feasible negative material solution in the process of transportation

the solicitation of space science mission concept proposals has been launched on this day. The relevant requirements have been released by the officials of the space center of the Chinese Academy of Sciences. After the one month solicitation, the space center of the Chinese Academy of Sciences will organize experts to select the mission concept proposals collected, and the selected proposals are expected to be announced before the Spring Festival of 2017

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