| Summary: | In order to study the influence of mechanical and chemical treatment on the performance of SiO2 negative electrode materials, this paper prepares SiO2 negative electrode materials by mechanical ball milling. The nanopowder of different ball milling periods is analyzed by X-ray diffraction (XRD), field emission scanning electron microscope, and constant current charge and discharge test and other methods. The XRD analysis shows that the crystallization of SiO2 increases with time which changes completely to amorphous state after 80h. According to the SEM observation, the SiO2 particle size decreases and becomes more uniform with the increasing ball milling time. According to the electrochemical test, the reversible lithium storage capacity of SiO2 increases with the increasing ball milling time, of which the sample after 80h of ball milling has the best comprehensive electrochemical performance with the 1st lithium storage capacity under current density of 100mAg-1 up to 1440.7mAhg-1 and the 1st coulomb efficiency of 53.8%. After 100 cycles, the reversible capacity increases from 188.4mAhg-1 of the pristine SiO2 to 571.4mAhg-1.
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