A liquid phase deposition method is performed to prepare acetylene black/sulfur (AB/S) composites, and in‐situ polymerization is utilized to synthesize polypyrrole (PPY) on the surface of AB/S. The coral‐like structured AB provides huge micropores and vast specific surface area for bonding sulfur, and supplies a 3D conductive matrix for enhancing the conductivity of composite. A plenty of ion channels served by PPY layer can promote the Li⁺ migration and alleviate the electrode polarization. In addition, the dissolution and diffusion of lithium polysulfides in the electrolyte can be restrained by PPY coating. The volume variation of cathode in the charge‐discharge process can be relieved by the high elastic PPY layer combined with the 3D matrix of AB. The Li‐sulfur battery (LSB) with the AB/S@PPY cathode exhibits an extraordinary cycle stability and rate adaptability with the specific capacities of 1207.1 mAh g⁻¹ at the initial discharge process and 884.4 mAh g⁻¹ even after 100 cycles at 0.2 C. Furthermore, an excellent specific capacity of 675.3 mAh g⁻¹ has been delivered by the AB/S@PPY electrode at a high discharge rate of 2 C.

中文翻译：

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通过构建内部导电网络和外部吸附层硫碳复合材料来增强锂电池的性能

进行液相沉积法制备乙炔黑/硫（AB / S）复合材料，并利用原位聚合在AB / S表面合成聚吡咯（PPY）。珊瑚状的AB提供了巨大的微孔和巨大的比表面积，用于结合硫，并提供了3D导电基质以增强复合材料的导电性。PPY层提供的大量离子通道可以促进Li ⁺迁移并减轻电极极化。另外，通过PPY涂层可以抑制多硫化锂在电解质中的溶解和扩散。通过高弹性PPY层与AB的3D矩阵相结合，可以缓解充放电过程中阴极的体积变化。带有AB / S @ PPY阴极的锂硫电池（LSB）具有出色的循环稳定性和速率适应性，在初始放电过程中的比容量为1207.1 mAh g ^-1，甚至在100倍的循环后仍为884.4 mAh g ^-1。 0.2 C.此外，AB / S @ PPY电极以2 C的高放电速率提供了675.3 mAh g ^-1的出色比容量。