Mesoporous hollow TiO₂ microboxes are synthesized by a two-step solvothermal method via CaTiO₃ intermediate. Composite consisting of TiO₂ microboxes and carbon nanotubes (CNT) is applied as a coating layer on conventional polymer separator for lithium-sulfur batteries. The cell using a modified separator exhibits enhanced cycling performance and rate capability. A discharge capacity of 852.3 mAh g⁻¹ is achieved at 0.2 C after 200 cycles and more than 500 mAh g⁻¹ of discharge capacity could be retained after 1000 cycles at 1 C, much better than the cells employing untreated or sole CNT-coated separator. Even at a high C-rate of 10 C, the cell with CNT-TiO₂-coated separator could deliver a high specific discharge capacity of 561 mAh g⁻¹. Such enhanced electrochemical performance is ascribed to the synergistic effect of CNT and TiO₂ on suppressing shuttle reactions of lithium polysulfides.

介孔中空TiO _2微箱是通过两步溶剂热法通过CaTiO ₃中间体合成的。由TiO _2微箱和碳纳米管（CNT）组成的复合材料作为涂层涂覆在锂硫电池的常规聚合物隔膜上。使用改良隔板的电池展现出增强的循环性能和速率能力。200次循环后在0.2 C时可达到852.3 mAh g ^-1的放电容量，在1 C下进行1000次循环后可保持500 mAh g ^-1以上的放电容量，这比采用未经处理或仅涂有CNT涂层的电池更好分隔器。即使在10 C的高C速率下，具有CNT-TiO ₂的电池涂覆的隔膜可提供561 mAh g ^-1的高比放电容量。这种增强的电化学性能归因于CNT和TiO ₂在抑制多硫化锂的穿梭反应中的协同作用。