Abstract
Carbon-doped SiO2 is synthesized by the in situ carbonization of halloysite. Carbon atoms partially substitute O atoms to form Si-C bonds and manipulate the localized electronic states of Si atoms, thereby endowing SiO2 with suitable adsorption strength and reducing the activation energy barrier for polysulfides in the sulfur redox. The C-SiO2/S cathodes for Li-S batteries exhibited superior electrochemical performance.
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