TiO2 nanoparticles anchored on three-dimensionally ordered macro/mesoporous carbon matrix as polysulfides' immobilizers for high performance lithium/sulfur batteries

A three-dimensionally (3D) ordered macro/mesoporous carbon (3DOMC) is synthesized by one-step template method as a TiO2 supporter, and this TiO2/3DOMC hybrid plays the role of immobilizers and can limit any polysulfides from escaping the cathode. The TiO2/3DOMC exhibits high pore volume and specific surface area, accommodating up to 73.2wt% in sulfur content. As a sulfur host, S/TiO2/3DOMC composite was able to delivered 1105mAhg(-1) on first discharge and 695mAhg(-1) after 150 cycles at a current rate of 0.5C. Even though at 2C this material was able to keep a capacity of 551mAhg(-1). We attribute the superior performance to the good conductivity and structural restriction of carbon and the intense electrostatic attraction between metal-oxygen bond and polysulfides to encapsulate sulfur of the TiO2/3DOMC.