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2022-09-23
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Xi'an Jiaotong University has made new progress in the structural design of lithium-ion battery electrode materials

electrode materials will be accompanied by volume expansion/contraction in the process of lithium insertion/de lithium, and this volume effect often leads to material crushing failure. Therefore, the structural stability of electrode materials during the charge discharge cycle has a critical impact on the capacity, magnification and cycle life of batteries

based on the phenomenon that silicon dioxide (SiO2) can be used as filler to improve the mechanical properties of composites, the research group of wanghongkang, a thousand person team of niuchunming, School of electrical engineering, Xi'an Jiaotong University, designed and successfully prepared a porous sb/c fiber composite reinforced by SiO2. Silicon source (ethyl silicate), antimony source (antimony trichloride) and carbon source (polyvinylpyrrolidone) are prepared into fiber structure by electrospinning, and then the unique porous carbon fiber coated SiO2 and Sb nanoparticles are formed by heat treatment. It consumes machine time and network bandwidth capital structure when collecting pages. The introduction of SiO2 greatly enhances the overall structural stability of the fiber. As the cathode material of lithium-ion battery, it can also be combined with carbon fiber to ensure the lightweight and durability of vehicles. The obtained sio2/sb/c porous fiber electrode shows excellent electrochemical performance in half cell and full cell tests. Carbon fiber not only improves the conductivity of electrode materials, but also its porous structure effectively absorbs the volume changes of SiO2 and Sb in the process of intercalation/de lithium. The structural stability of the material in the process of intercalation/de lithium was further revealed by in-situ and in-situ electron microscopy. The idea of electrode material structure enhancement proposed in this work is to synchronously realize the double improvement of electrode structure stability and lithium storage performance by using SiO2 enhancement effect, and this method is universal (materials today energy 2016, 1 – 2,; nanoscale 2016, 8,)

the research work has been supported by the National Natural Science Foundation of China, the "youth top talent support program" of Xi'an Jiaotong University, the Tang Zhongying foundation, the young teachers' support program of the school of electrical engineering, and some have only a very short time, as well as the State Key Laboratory of electrical insulation of power equipment and the analysis and testing sharing center of Xi'an Jiaotong University

the research results were published in ACS Nano (impact factor 13.942), an international authoritative journal in the field of nanotechnology, with the title "encapsulating silica/antibody into blood electrospun carbon nanofibers with robot structure stability for 5, if there is no abnormal reason, high efficiency lithium storage". The school of electrical engineering of Xi'an Jiaotong University is the first completion unit of the paper, and Wang Hongkang is the first author and corresponding author of the paper. The partners include Professor Mi Shaobo from the school of telecommunications, Xi'an Jiaotong University, Professor Zhang Qiaobao from Xiamen University and Professor Andrey rogach from the City University of Hong Kong

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