TiO₂-coated sulfur-acetylene black composite with a core-shell structure is synthesized via a simple process and investigated as a cathode for the lithium-sulfur batteries. The composite nanoparticle sizes are in the range of 50–100 nm, and the thickness of TiO₂ shell is about 10–50 nm. The composites can greatly slow down the dissolution of lithium polysulfide and stabilize the structure during the charge and discharge process to achieve good long cycle and rate performances. After 500 cycles at a current density of 200 mA g⁻¹, it still delivers a reversible capacity of 312.8 mAh g⁻¹. And the nanocomposite can still remain a specific capacity of 625.4 mAh g⁻¹ with the current density of 1000 mA g⁻¹.

中文翻译：

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锂硫电池用TiO 2包覆的硫碳纳米复合正极

通过简单的方法合成了具有核-壳结构的TiO ₂包覆的硫-乙炔黑复合材料，并将其用作锂硫电池的正极。复合纳米颗粒的大小在50-100 nm范围内，TiO ₂壳的厚度约为10-50 nm。该复合材料可大大减慢多硫化锂的溶解，并在充电和放电过程中稳定结构，以实现良好的长周期和倍率性能。在200 mA g ^-1的电流密度下经过500次循环后，它仍可提供312.8 mAh g ^-1的可逆容量。纳米复合材料在1000 mA g的电流密度下仍可保持625.4 mAh g ^-1的比容量^-1。