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New achievements in research of SIBs published by Sun Kening team of BIT in Advanced Energy Materials

release date :2019-05-05 06:45:00  |   [ close window ]ViewCount:

    Translator: Zhao Shengtao, News Agency of BIT

    Editor: News Agency of BIT

   

  These days, the team of Sun Kening in Beijing Institute of Technology(BIT) School of Chemistry and Chemical Engineering has made new progress in the research of high-rate, long-circulating sodium ion battery negative electrode. By constructing mesoporous hollow structure and controlling the spacing of carbon layers by hetero-atoms, carbon negative materials with high rate performance and cyclic stability were obtained. The result of this study is Heteroatom-Doped Mesoporous Hollow Carbon Spheres for Fast Sodium Storage with an Ultralong Cycl E Life published online in the top international energy journal Advanced Energy Materials (Impact Factor 21.8). The corresponding author are professor Sun Kening and special associate researcher Sun Wang. The first author is Ni Dan, Ph. D student of BIT, School of Chemistry and Chemical Engineering.

  Compared with Li-ion batteries, Na-ion batteries have the advantages of rich resources and low price, and can be used as a new generation of energy storage batteries. Considering the intermittency and volatility of renewable energy sources in the application environment of energy storage batteries and the economy of energy storage system, the development of electrode materials with high rate and long cycle performance is an urgent problem to be solved in the application of sodium ion batteries. Carbon negative materials have high commercial prospects because of their low cost and environmental friendliness. However, in the process of charging and discharging, due to the large ion radius of sodium ions, the ion diffusion rate will be slow, and the electrode volume will be changed greatly, which will lead to the double rate performance of the battery and its follow-up. The poor ring stability restricts the practical application of carbon materials. In order to realize the high rate and long cycle performance of sodium ion battery, carbon electrode material is needed to have fast electron and ion conduction ability, and ensure the stability of electrode structure after charging and discharging. For the rapid diffusion of sodium ions with large radius, it is necessary to regulate the spacing of carbon layers.

  Based on the above-mentioned material design ideas, Sun Kening team prepared sulfur-nitrogen co-doped mesoporous hollow carbon spheres (SN-MHCSs) for sodium ion batteries based on polydopamine surface coating technology and hetero-atom-doped carbon structure regulation method. The mechanism of sodium storage and the change of carbon structure after circulation were also analyzed. The study shows that: 1. The thin-walled hollow spherical structure is advantageous to ion and electron conduction, it can buffer the volume change during charge and discharge, the mesoporous structure on the surface of carbon ball can promote the diffusion of electrolyte and the utilization of inner surface of carbon ball. High specific surface area ensures rapid sodium storage controlled by surface capacitance process Deposit 2. Heteroatom doping can increase the spacing of carbon layers, promote the diffusion and storage of sodium ions, increase the electronic conductivity and enhance the capacity. 3. In the process of cycling, the intercalation and stripping of sodium ions can enlarge the spacing of carbon layers, make the arrangement of carbon layers more orderly, promote the transport of sodium ions and electrons, and lead to the increase of electrode capacity after cycling.

  This study provides new ideas for the development of anode materials for high-rate, long-cycle sodium ion batteries. This structure can also be used in other energy systems requiring fast electron / ion transport and long-term cycle stability.

Paper Links:https://onlinelibrary.wiley.com/doi/10.1002/aenm.201900036

Personal Profile of Sun Kening & Sun Wang:

  Sun Kening, professor of Beijing Institute of Technology, doctoral supervisor, special professor of Yangtze River scholar of Ministry of Education, leader of innovation team of Ministry of Education, director of Beijing key Laboratory of Chemical Power supply and Green Catalysis, has won three national awards. 8 provincial awards. Mainly engaged in the field of electrochemical, new energy materials cross-research, has published in the Nature Commun., Adv. Mater., Adv. Energy Mater., Nano Letter and other international academic journals more than 330 papers, he cited nearly 6000 times, obtained the national invention patent license Elsevier China High-ranking Scholars (Energy sector) for five consecutive years from 2014 to 2018.

  Sun Wang, special associate fellow of Beijing Institute of Technology and doctoral supervisor, is mainly engaged in energy storage and conversion materials, device and system integration research. He has won one second prize of the National Technical Invention Award and one first prize of the Science and Technology Progress Award of the Ministry of Education. In Adv Energy Mater.,J. Mater. Chem. A,Nanoscale, Chem. Comm. More than 30 papers have been published in international academic journals, and one invention patent has been granted.

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