Key Laboratory of Macromolecular Science of Shaanxi Province, Shaanxi Key Laboratory for Advanced Energy Devices and Shaanxi Engineering Lab for Advanced Energy Technology & School of Materials Science and Engineering and ‡School of Chemistry and Chemical Engineering, Shaanxi Normal University , Xi'an 710119, China.
ACS Appl Mater Interfaces. 2017 Oct 11;9(40):34783-34792. doi: 10.1021/acsami.7b07982. Epub 2017 Sep 29.
Sulfur was impregnated into hyper-cross-linked porous polymer (HCP) with a high specific area and unique porous structure. Compared to its inorganic or carbon counterparts, the HCP has a relatively high specific surface area of 1980 m g with a total pore volume of 2.61 cm g, resulting in sulfur content in HCP/S of as high as 80 wt %. As a benefit of the unique HCP structure, the HCP/S composite exhibits a high initial discharge specific capacity (1333 mA h g at 0.2 C), high-rate property, and good cycling stability (658 mA h g after 120 cycles at 0.5 C and 604 mA h g after 80 cycles at 1 C). Furthermore, the capacity of cells loses less than 1% after the first 20 charge/discharge cycles, while the HCP/S cathode can be cycled with an excellent Coulombic efficiency of above 94% after 120 cycles. Compared with pristine sulfur, the superior electrochemical performance of HCP/S composite is related to the cross-linked porous framework. Such structure could provide short ionic/electronic conduction pathways and suppress the polysulfide shuttle during the discharge process.
硫被浸渍到具有高比表面积和独特多孔结构的超交联多孔聚合物（HCP）中。与无机或碳相比，HCP 的比表面积相对较高，为 1980 m g，总孔体积为 2.61 cm g，导致 HCP/S 中的硫含量高达 80wt%。由于独特的 HCP 结构的优势，HCP/S 复合材料表现出高的初始放电比容量（在 0.2 C 时为 1333 mA h g）、高倍率性能和良好的循环稳定性（在 0.5 C 时 120 次循环后为 658 mA h g，在 1 C 时 80 次循环后为 604 mA h g）。此外，在最初的 20 次充放电循环后，电池的容量损失不到 1%，而 HCP/S 正极在 120 次循环后可以以高于 94%的库仑效率循环。与原始硫相比，HCP/S 复合材料的优越电化学性能与交联多孔骨架有关。这种结构可以提供短的离子/电子传导途径，并在放电过程中抑制多硫化物穿梭。
