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The commercialization of lithium sulfur batteries faces great challenges, such as shuttle effect and low conductivity. Herein, we explore embedding anoxic oxide SnO 2−x in a porous carbon matrix as a separator-modifying material for lithium sulfur batteries. This material can limit the size of SnO 2−x particles and reduce their agglomeration through confining by the porous carbon (PC). As a result, more adsorption and catalytic sites can be obtained. Moreover, the oxygen vacancies in SnO 2−x can change the electronic environment to enhance the adsorption and catalysis of polysulfides, resulting in the depression of the shuttle effect of the battery. Therefore, the lithium sulfur battery with the SnO 2−x / PC-modified separator has excellent cycling performance. At a current rate of 1 C, it can provide a high initial discharge capacity of 1049.4 mAh g −1 and maintain a reversible specific capacity of 798.4 mAh g −1 after 300 cycles.

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