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Ti4O7 Layer Coated Sulfur Composite as High-Performance Cathode Material for Lithium-Sulfur Battery

The application of Li-S battery is hindered mainly due to the shuttle effect of the polysulfide, which is produced via discharge process. Most recently, metal oxides are applied for inhibiting this shuttle effect. In our work, mesoporous Ti 4 O 7 /S composites are prepared and employed into Li-S battery. The mesoporous Ti 4 O 7 layer in the Ti 4 O 7 /S composites could provide both physical absorption and chemical bond between the polysulfide and cathode material. As a result, the electrochemical results show that the Ti 4 O 7 /S composites have excellent cycle stability and high specific capacity. This excellent electrochemical performance is attributed to the presence of Ti 4 O 7 layer in the composite.