LAUSR

Abstract 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 0.75 C 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 stable discharge capacity of ∼ 4.5 mAh cm-2 with high Coulombic efficiency of 92.9% and good cycle stability. 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.