Xi 'an Jiaotong University have made new progress in the structural design of lithium ion battery electrode materials

Electrode materials have volume expansion/contraction in the process of embedded/lithium off, and the volume effect can result in material crushing failure. Therefore, the electrode material in the process of charging and discharging cycle structure is stable, which has a crucial influence on battery capacity, rate and cycle life performance.

Based on silica (SiO2) as the filler can improve the mechanical properties of composite materials to this phenomenon, xi 'an Jiaotong university institute of electric NiuChunMing one thousand team Wang Gongkang teacher group design and preparation of a kind of SiO2 successfully enhanced fiber porous Sb/C composite materials. Using electrostatic spinning method to silicon source (ethyl silicate), antimony (antimony trichloride) and carbon sources (polyvinylpyrrolidone) preparation into fiber structure, again through the heat treatment step formed porous carbon fiber coated SiO2 and Sb the unique structure of nanoparticles. The introduction of SiO2 greatly enhances the whole structure stability of the fiber. As a lithium ion battery porous anode material, the SiO2 / Sb/C fiber electrode in half cell and the battery test showed excellent electrochemical performance. Carbon fiber not only improves the conductivity of the electrode material, and its porous structure effectively given SiO2 and Sb in the process of embedded/lithium off volume change. Characterized by in situ and ex situ electron microscopy (SEM), and further reveals the structural stability in the process of material in the embedded/lithium off. Puts forward some ideas of electrode material structure to enhance the work, it is using the enhanced effect of SiO2 (Silica - Reinforcement Effect) synchronous implementation lithium electrode structure stability and storage performance of double ascension, and this method has generality (MaterialsTodayEnergy2016, 1, 2, 24-32;Nanoscale2016, 8759-8759).

The results of the study entitled "Encapsulating Silica/Antimony into Porous Electrospun Carbon Nanofibers with Robust Structure Stability for High - Efficiency Lithium Storage", published online in the field of nanometer ACSNano international authoritative journals (impact factor of 13.942).Xi 'an Jiaotong university college as the first complete unit, the paper Wang Gongkang for the paper's first author and corresponding author. Partners including xi 'an Jiaotong university college of telecom Zhangqiao less rice wave, a professor at Xiamen University professor Bao and Andrey Rogach professor, city university of Hong Kong, etc.

Research work for the national natural science foundation of China, xi 'an Jiaotong university, "youth talent support plan", Cyrus tang foundation, electrical college young teachers to support planning and power equipment state key laboratory of electrical insulation, xi 'an Jiaotong university Shared analysis test center support.

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