State Key Laboratory of Applied Organic Chemistry and Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, People's Republic of China.
Nanoscale. 2018 Jul 13;10(27):13037-13044. doi: 10.1039/c8nr01530a.
Well-defined core-shell structured coaxial sulfur/polypyrrole tubular nanocomposites, polypyrrole nanotubes wrapped by uniform rough sulfur layers, were fabricated as Li-S battery cathodes via a facile one-pot method. In the designed structure, the polypyrrole backbone can facilitate the charge transport and also restrain the soluble polysulfide diffusion, while the active sulfur layer can efficiently react with Li+ assisted by the PPy nanotubes, and the lithium polysulfides can be massively trapped by the PPy nanotubes during charge-discharge processes. The as-prepared coaxial sulfur/polypyrrole tubular nanocomposites with a sulfur loading of 53.3% exhibited a high initial discharge specific capacity of 1117 mA h g-1 with a remarkable cycling stability, retaining 692 mA h g-1 and 525 mA h g-1 after 200 cycles at a current density of 0.2C and 1C, respectively. Moreover, they expressed an excellent rate capability performance, maintaining 470 mA h g-1 at a high current density of 2C.
通过简便的一步法制备了作为 Li-S 电池正极的具有核壳结构的规整同轴硫/聚吡咯管状纳米复合材料，即均匀粗糙硫层包裹的聚吡咯纳米管。在设计的结构中，聚吡咯主链可以促进电荷传输，同时也可以抑制可溶性多硫化物的扩散，而活性硫层可以在 PPy 纳米管的辅助下与 Li+ 高效反应，并且在充放电过程中，聚吡咯纳米管可以大量捕获多硫化锂。所制备的具有 53.3%载硫量的同轴硫/聚吡咯管状纳米复合材料具有很高的初始放电比容量（1117 mA h g-1），并且具有出色的循环稳定性，在 0.2C 和 1C 的电流密度下循环 200 次后，分别保持 692 mA h g-1 和 525 mA h g-1。此外，它们表现出优异的倍率性能，在 2C 的高电流密度下仍保持 470 mA h g-1。
