Xi'an Jiaotong University has developed a high Coulomb efficiency silicon anode lithium battery

Recently, the research group of Professor Xiaoquan Zheng of the School of Electrical Engineering of Xi’an Jiaotong University and the research group of Professor Yi Cui of the School of Materials Science and Technology of Stanford University and the research group of Professor Li Ju of the Department of Nuclear Engineering of the Massachusetts Institute of Technology worked together to apply a special method to the outer surface of the nano-silicon anode. A layer of artificial titanium dioxide nano-layer was coated to synthesize a high mechanical strength Si@TiO2yolk-shell structure negative electrode, and a Si@TiO2 structure silicon negative electrode full battery with a high-pressure compaction density was prepared, which achieved twice the size of the traditional graphite negative electrode. Volume specific capacity and 2 times the mass specific capacity.

Currently commercialized lithium-ion batteries are only used for low-level power requirements. Silicon has a theoretical specific capacity that is more than 10 times that of traditional graphite anodes. Large-capacity anode material for the first generation of lithium-ion batteries. However, the problem of low Coulomb efficiency in the charge and discharge process of the silicon anode has not been overcome.

After experimental testing, the mechanical strength of the titanium dioxide shell of this new achievement is 5 times that of amorphous carbon, which can make the stable coulombic efficiency reach more than 99.9%, meet the application standards of industrialization, and will effectively promote the silicon body Commercial applications of negative electrodes in the battery industry. The results were published in 'Energy and Environmental Science' recently.

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