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    Home > Lu Zhouguang, Professor of South University of science and technology, proposed a new strategy to improve the ratio performance of electrode materials

    Lu Zhouguang, Professor of South University of science and technology, proposed a new strategy to improve the ratio performance of electrode materials

    • Last Update: 2019-10-27
    • Source: Internet
    • Author: User
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    Recently, Professor Lu Zhouguang, Department of materials science and engineering, South University of science and technology, put forward a new strategy to improve the rate performance of negative electrode materials for sodium ion batteries by defect induced selective surface doping The results were published in ACS Nano (DOI: 10.1021 / acsnano 9b03766) TiO 2 materials have many advantages, such as rich resources, environment-friendly, near zero stress during charging and discharging, and high theoretical specific capacity However, due to the slow diffusion of Na + in TiO2 Electrode material and the low electronic conductivity, the electrode rate performance of the material is poor, which seriously restricts its commercial application Phosphorus doping can effectively improve the conductivity of TiO2 However, the traditional phosphating strategy has low efficiency for TiO2 doping At present, the amount of phosphorus obtained by hydrothermal method, sol-gel method and by means of decomposition of NaH 2 PO 2 for gas phosphating is generally less than 2 at% The main reason is that the crystal structure of TiO2 is very stable, which limits the diffusion and migration of heteroatoms In addition, it has been reported that the high doping concentration of heteroatom will destroy the crystallinity of the material and seriously affect its cycle stability Therefore, the preparation of TiO2 with high doping concentration and good crystallization is very challenging Professor Lu Zhouguang's research group found that the existence of defects such as oxygen vacancy and trivalent titanium can not only improve the electronic conductivity of TiO2 Electrode Materials, but also improve the diffusion and mobility of Fe, s, P, Mg 2 + and Na + plasma With the help of defects such as oxygen vacancy and trivalent titanium, the surface of TiO2 will realize selective high concentration P doping, which will greatly improve the electrochemical performance of TiO2 Electrode Materials in sodium ion batteries Therefore, the research group developed a simple strategy of defect induced selective doping of P on the surface of TiO 2: through the reduction reaction with sodium borohydride, the research group introduced an amorphous layer rich in oxygen vacancy and trivalent titanium defects on the surface of TiO 2 The amorphous layer selectively doped high concentration on the surface of TiO 2 nanoparticles without sacrificing the crystallinity of the main body of TiO 2 P A uniform amorphous tio2-x-p layer is constructed, and the synthesis route is shown in Figure 1 Figure 1 Schematic diagram of high phosphorous TiO2 @ tio2-x-p core-shell nanostructure prepared by defect induced surface selective doping strategy (source: ACS Nano) The tio2-x-p layer can be used as a "highway" for electronic transmission and a "buffer belt" for efficient sodium ion insertion / removal At the same time, the main TiO2 phase ensures the high specific capacity and good stability of the whole material Therefore, this special core-shell structure gives TiO2 @ tio2-x-p nanoparticles the advantages of high electronic conductivity and stable cycle performance This work was mainly completed by Gan Qingmeng, a doctoral student jointly trained by the South University of science and the National University of Singapore of Lu Zhouguang research group Many members of the research group participated in the research work This project has been supported by the project of basic research department of Shenzhen Science and technology innovation Commission, National Natural Science Foundation of China, Key Laboratory of electric drive energy materials of Guangdong Province, and the project of Pearl River innovation research group of Guangdong Province, and has been greatly assisted by Qiu Yang and other teachers from the Supercomputing Center and the analysis and testing center of South University of science and technology.
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