New progress has been made in the design of electrode materials for lithium ion batteries

In the process of imbedding/delithium, the electrode material will expand/contract in volume, and this volume effect will often lead to the failure of the material. Therefore, the structure stability of the electrode material in the charging and discharging cycle has a crucial influence on the capacity, power and cycle life of the battery.

Based on the fact that silica (SiO2) can be used as the filler to improve the mechanical properties of composite materials, a porous Sb/C fiber composite reinforced by SiO2 was designed and successfully prepared by Mr. Wang hongkang, a thousand people team from the school of electrical engineering, xi 'an jiaotong university. The silica (ethyl silicate), antimony (antimony trichloride) and carbon (polyvinylpyrrolidone) sources were prepared into fiber structure by electrostatic spinning method, and then the unique structure of porous carbon fiber coated with SiO2 and Sb nanoparticles was formed through heat treatment. The introduction of SiO2 greatly enhanced the overall structural stability of the fiber. As the cathode material of lithium ion battery, the obtained SiO2/Sb/C porous fiber electrode has shown excellent electrochemical performance in both the half-cell and full-cell tests. Carbon fiber not only improves the conductivity of electrode materials, but also effectively absorbs the volume change of SiO2 and Sb in the process of embedding/delithium. The structural stability of the material during lithium implantation/delithium removal was further revealed by in-situ and non-in-situ electron microscopy. Puts forward some ideas of electrode material structure to enhance the work, it is using the enhanced effect of SiO2 (Silica - ReinforcementEffect) synchronous implementation lithium electrode structure stability and storage performance of double ascension, and this method has generality (MaterialsTodayEnergy2016, 1, 2, 24-32; Nanoscale2016, 8759-7603).

The results of the study entitled "EncapsulatingSilica/AntimonyintoPorousElectrospunCarbonNanofiberswithRobustStructureStabilityforHigh - EfficiencyLithiumStorage", published online in the field of nanometer ACSNano international authoritative journals (impact factor of 13.942). School of electrical engineering, xi 'an jiaotong university is the first completion unit of this paper, and wang hongkang is the first author and corresponding author of this paper. The partners include professor mishaobo from school of telecommunications, xi 'an jiaotong university, professor zhang qiaobao from xiamen university and professor AndreyRogach from city university of Hong Kong.

The research work was supported by the national natural science foundation of China, xi 'an jiaotong university "young top talent support program", tang zhongying foundation, young teachers support program of the school of electrical engineering, state key laboratory of electrical insulation of power equipment, and xi 'an jiaotong university analysis and test sharing center.

The page contains the contents of the machine translation.