Zhang Xuqing, Xie Dong, Zhong Yu, Wang Donghuang, Wu Jianbo, Wang Xiuli, Xia Xinhui, Gu Changdong, Tu Jiangping
State Key Laboratory of Silicon Materials, Key Laboratory of Advanced Materials and Applications for Batteries of Zhejiang Province and School of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027, China.
School of Physics and Electronic Engineering, Taizhou University, Taizhou, 318000, China.
Chemistry. 2017 Aug 4;23(44):10610-10615. doi: 10.1002/chem.201701564. Epub 2017 Jul 7.
Lithium-sulfur batteries (LSBs) are considered to be among the most promising next-generation high-energy batteries. It is a consensus that improving the conductivity of sulfur cathodes and impeding the dissolution of lithium polysulfides are two key accesses to high-performance LSBs. Herein we report a sulfur/carbon black (S/C) cathode modified by self-polymerized polydopamine (pDA) with the assistance of polymerization treatment. The pDA acts as a novel and effective shell on the S/C cathode to stop the shuttle effect of polysulfides. By the synergistic effect of enhanced conductivity and multiple blocking effect for polysulfides, the S/C@pDA electrode exhibits improved electrochemical performances including large specific capacity (1135 mAh g at 0.2 C), high rate capability (533 mAh g at 5 C) and long cyclic life (965 mAh g after 200 cycles). Our smart design strategy may promote the development of high-performance LSBs.
锂硫电池（LSBs）被认为是最有前途的下一代高能量电池之一。提高硫阴极的导电性和阻止多硫化锂的溶解是实现高性能锂硫电池的两个关键途径，这已成为共识。在此，我们报道了一种通过聚合处理辅助自聚合聚多巴胺（pDA）改性的硫/炭黑（S/C）阴极。pDA在S/C阴极上形成了一种新颖且有效的壳层，以阻止多硫化物的穿梭效应。通过增强导电性和对多硫化物的多重阻挡效应的协同作用，S/C@pDA电极表现出改善的电化学性能，包括大比容量（在0.2C时为1135 mAh g）、高倍率性能（在5C时为533 mAh g）和长循环寿命（200次循环后为965 mAh g）。我们的智能设计策略可能会促进高性能锂硫电池的发展。
