Lithium-sulfur (Li-S) batteries are currently being explored intensely due to their high theoretical specific energy density and low cost[1].However,the areal sulfur loading of electrodes is usually less than 2.0 mg cm-2,which leads to low areal capacity that does not even outperform standard Li-ion batteries (4 mAh cm-2),greatly degrading the high-energy advantage of Li-S batteries.