Nano‐sized Titanium Nitride Functionalized Separator Improves Cycling Performance of Lithium Sulfur Batteries

Abstract

Abstract High‐energy lithium‐sulfur batteries have been plagued by the poor cyclability due to the soluble lithium polysulfide intermediates into the organic electrolyte. Here, we design a separator functionalized by a simple coating of nanosized titanium nitride and super C65. Lithium‐sulfur batteries with the functional separator achieve a high specific capacity of 935 mAh g −1 at a current density of 0.5 C, and show a super‐long cycling performance at a small degradation rate. The improvement mechanisms introduced by the new separator are further investigated by the electrochemical analysis and theoretical calculation.