Chemistry - A European Journal
Chemistry - A European Journal
4 years ago

Performance Enhancement of a Sulfur/Carbon Cathode by Polydopamine as an Efficient Shell for High-Performance Lithium–Sulfur Batteries

Performance Enhancement of a Sulfur/Carbon Cathode by Polydopamine as an Efficient Shell for High-Performance Lithium–Sulfur Batteries
Changdong Gu, Donghuang Wang, Yu Zhong, Jianbo Wu, Xuqing Zhang, Jiangping Tu, Xinhui Xia, Xiuli Wang, Dong Xie
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−1 at 0.2 C), high rate capability (533 mAh g−1 at 5 C) and long cyclic life (965 mAh g−1 after 200 cycles). Our smart design strategy may promote the development of high-performance LSBs. Batteries included: Core–shell S/C@pDA composites are synthesized by sulfur/carbon black (S/C) hybrids modified with self-polymerized polydopamine (pDA), and exhibit improved electrochemical performances.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/chem.201701564

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