A　novel　silica@gallium　core–shell　structure　is　designed　to　maximize　catalytically　active　surface　gallium　for　highly　efficient　electrocatalysis　of　lithium　polysulfides　in　lithium-sulfur　batteries.　The　fabricated　SiO2@Ga/S　cathode　battery　exhibits　a　high　reversible　capacity　of　927.1　mAh　g−1　at　0.75C　and　excellent　cycling　stability　with　a　capacity　retention　rate　of　85.97%　for　600　cycles.　When　the　sulfur　mass　loading　is　up　to　6.5　mg　cm−2,　the　battery　displays　a　high　discharge　capacity　of　~　4.145　mAh　cm−2　with　high　Coulombic　efficiency　of　85.04%　after　200　cycles.　Finally,　a　mechanism　that　the　highly　conductive　electron-given-surface　of　liquid　metal　Ga　shell　on　the　surface　of　SiO2　in　the　thick　electrodes　for　reversible　electrocatalysis　of　lithium　polysulfides　in　lithium-sulfur　batteries　is　proposed.　©　2021　Elsevier　B.V.