The team of energy conversion materials led by Prof. Chen Gang from the School of Chemical Engineering and Chemistry has made significant progress in the research of negative electrode materials for lithium ion batteries. The research results were published in Advanced Materials (Impact Factor 19.79), the leading journal in the field of materials science. The paper entitled " Engineering 2D Nanofluidic Li-Ion Transport Channels for Superior Electrochemical Energy Storage ", was selected as Front Cover, Professor Chen Gang was the author of the article, and the team Yan Chun Shuang and Lu Chad doctoral students as co-author, our school as the first communication unit.
In recent years, lithium-ion batteries have gradually become mainstream power sources of portable electronic devices due to their high energy density, long cycle life and environmental friendliness, and are considered to be the most applicable to electric vehicles and hybrid electric vehicle drives In addition, lithium-ion battery can store and convert green energy such as solar energy and wind energy to alleviate the intermittence and instability of the above-mentioned green energy and balance the supply and demand of energy.At present, the demand for lithium-ion battery in many fields Increasing the capacity of traditional electrode materials and rapid charge-discharge capacity has reached the bottleneck.It is urgent to develop electrode materials with high rate performance to meet efficient and fast energy storage and output.
Chen Gang team first proposed the introduction of 2D nanofluidic structure into the cobalt oxide negative electrode material to improve the rate performance of the material.The team prepared by simple sol-gel method anionic group surface modification of the nano-sheet, the modified base The clusters facilitate the assembly of nanosheets into a self-supporting layer stack with nanosheets spaced slightly less than twice the length of the lithium-ion Debye to provide two-dimensional fluidic channels for the transport of lithium ions. Selectively attracting lithium ions, repelling negative ions and accelerating lithium ion transmission.It has been found through electrochemical tests that the ion conductivity of the fluid channel nanosheets is several orders of magnitude larger than that of the bulk materials, and the rate performance of the battery is greatly improved. This work points out a new direction for effectively improving the rate performance of electrode materials, and also provides a new exploration idea for constructing a lithium ion battery with high power and stability.
The research was supported by the National Natural Science Foundation of China and Professor Yu Guihua of the University of Texas at Austin.
Professor Chen Gang's research team is devoted to the research work of new energy conversion functional materials. In 2017, he published more than 20 high-level research papers in "Advanced Materials", "Advanced Functional Materials" and "Nano-Energy". Among them, Citing papers 2. The research team won the 2017 annual letter innovation and entrepreneurship scholarship and Harbin Institute of the top ten graduate team .Paper the first author 13 grade doctoral student Yan Chun Shuang as the first author published SCI papers 8, of which the impact factor greater than 10 Of the total, the total factor of more than 70, won the Baosteel Outstanding Student Award, Chunhui Innovative Achievement Award, National Graduate Scholarship and was named the top ten postgraduates of HIT.
