Professor Chen Gang of HIT University has made important progress in the research process of negative electrode materials for lithium ion batteries

The energy conversion material team led by Professor Chen Gang of the HIT has made important progress in the research of negative electrode materials for lithium ion batteries. The research results were published in Advanced Materials(Impact Factor 19.79), a top journal in the field of materials science. The paper is entitled "Construction of Two-dimensional nanofluid Channel for Excellent Electrochemical energy storage"(Engineering 2DNanofluidicLi-Ion Transverse Channels Superpower Energy), The article was selected as Front Cover, Professor Chen Gang was the article newsletter author, team doctoral students Yan Chunshuang and Lu Chad were the co-authors, and HIT was the first communication unit.

In recent years, lithium-ion batteries have gradually become the mainstream power supply of portable electronic equipment due to their high energy density, long cycle life and environmental friendliness, and are considered to be the most promising power sources for electric vehicles and hybrid electric vehicle driving devices.. In addition, lithium-ion batteries can store and convert green energy such as solar energy and wind energy to ease the intermittent and unstable nature of the above-mentioned green energy and achieve a balance between energy supply and demand. At present, the demand for lithium-ion batteries in many fields is increasing, and the capacity of traditional electrode materials and the ability of rapid charging and discharging have reached a bottleneck. It is urgent to develop the electrode material with high magnification performance to satisfy the effective and fast energy storage and output.

The Chen Gang team first proposed to introduce a two-dimensional nanofluidic structure into the cobalt oxide anode material to improve the rate performance of the material. The team prepared anionic group surface-modified nanosheets by a simple sol-gel method. These modified groups facilitate the assembly of nanosheets into a self-supporting layer stack. The spacing of the nanosheets is slightly less than twice the length of the lithium ion Debye, providing a two-dimensional fluid channel for the transport of lithium ions. The negatively charged groups on the inner wall of the channel selectively attract lithium ions, repel negative ions, and accelerate the transport of lithium ions. Electrochemical tests have found that the ionic conductivity of fluid channel nanosheets is several orders of magnitude larger than that of bulk materials, and the rate performance of the battery is greatly improved. This research work points out a new direction for effectively improving the rate performance of electrode materials, and provides a new exploration idea for building high-power, high-stability lithium-ion batteries.

The research work was supported by the National Natural Science Foundation and Professor Yu Guihua of the University of Texas at Austin.

Professor Chen Gang's research team is committed to the research work of new energy conversion functional materials. In 2017, he published more than 20 high-level research papers in such journals as Advanced Materials, Advanced Functional Materials, and Nano Energy. 2 papers cited. The research team won the 2017 Industrial Letters Innovation and Entrepreneurship Scholarship and the “Top Ten Graduate Team” of Harbin Institute of Technology. The first author of the thesis, 13th grade doctoral student Yan Chunshuang published 8 SCI papers as the first author, including 4 articles with influence factors greater than 10, and the total impact factor totaled more than 70. He was awarded the Baosteel Outstanding Student Award, Chunhui Innovation Achievement Award, and the graduate national scholarship. He was also named as one of the top ten talents of Harbin Institute of Technology.

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