Lithium-sulfur batteries have great potential for high-performance energy-storage devices,yet the severe diffusion of soluble polysulfide to electrolyte greatly limits their practical applications.To address the above issues,herein we design and synthesize a novel polymer binder with single lithium-ion channels allowing fast lithium-ion transport while blocking the shuttle of unnecessary polysulfide anions.In situ UV-vis spectroscopy measurements reveal that the prepared polymer binder has effective immobilization to polysulfide intermediates.As expected,the resultant sulfur cathode achieves an excellent specific capacity of 1310 mAh g-1 at 0.2 C,high Coulombic efficiency of 99.5％ at 0.5 C after 100 cycles and stable cycling performance for 300 cycles at 1 C (1 C =1675 mA g-1).This study reports a new avenue to assemble a polymer binder with a single lithium-ion channel for solving the serious problem of energy attenuation of lithium-sulfur batteries.