A lithium sulfur battery with superior capacity retention is unexpectedly achieved by using a nano-sized TiO₂-embedded polymer electrolyte. Computational results based on bonding interaction and Raman characterization of the different components reveal the undesired shuttle mechanism causing the passivation of Li anode can be suppressed due to the preferential adsorption effect of the nano-sized TiO₂ to the polysulfides. This configuration can deliver more than 1450 mAh/g for the first discharge capacity with ~87% capacity retention after 100 cycles versus 38% in the absence of TiO₂ due to the inhibition of polysulfide species passivated on the lithium anode. Thus, it provides an opportunity of overcoming today’s new technological system issue.