ABSTRACT

The PEDOT/TiO₂ nanocomposites with different TiO₂ particle sizes were fabricated by a simple soft chemical approach-assisted in situ synthesis route and used as an effective cathode of Li-S batteries. When the TiO₂ particle size was 5 nm, the discharge capacity of the cells is the best and the initial discharge capacity is 859.7 mAhg⁻¹, within 300 charge–discharge cycles at 1 C. The improvement on cells electrochemical performance is attributed to the TiO₂ particles well dispersed in the PEDOT, and the PEDOT creates integral electronic conductive net-work and prevent soluble long-chain polysulphides diffuse into the liquid electrolyte during the charge–discharge processes.

摘要

具有不同TiO ₂粒径的PEDOT/TiO ₂纳米复合材料通过简单的软化学方法辅助原位合成路线制备，并用作Li-S电池的有效阴极。当 TiO ₂粒径为 5 nm 时，电池的放电容量最好，初始放电容量为 859.7 mAhg ^-1，在 1 C 300 次充放电循环内。电池电化学性能的提高归因于TiO ₂颗粒很好地分散在 PEDOT 中，PEDOT 形成完整的电子导电网络并防止在充放电过程中可溶性长链多硫化物扩散到液体电解质中。