Abstract
In this work, amorphous silica was uniformly embedded at the nano-scale in the tunnel wall of mesoporous carbon, with no free or aggregated silica or carbon particles in the cavity of the tunnels. The tunnel provides sufficient space for the volume expansion of SiO2, while the carbon skeleton forms electric conducting paths for the electrochemical reaction/activation of the silica. Therefore, impregnation of inactive and insulating SiO2 particles in active and conducting mesoporous carbon (SiO2-MC) is beneficial for improving the electrochemical activity and cycling performance of the former as an LIB anode. As a result, the SiO2-MC composite delivers a reversible capacity of 670mAhg−1, much higher than that of the composite (SiO2+MC) containing SiO2 aggregates (~300mAhg−1). This impregnation concept can be applied in the structural design of composite electrodes for other secondary batteries and preparation of high-efficiency catalysts.
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