1. Highly crosslinked organosulfur copolymer nanosheets with abundant mesopores as cathode materials for efficient lithium-sulfur batteries.
- Author
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Zeng, Shuaibo, Li, Ligui, Yu, Jingping, Wang, Nan, and Chen, Shaowei
- Subjects
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ORGANOSULFUR compounds , *COPOLYMERS , *LITHIUM sulfur batteries , *VULCANIZATION , *POLYSULFIDES - Abstract
Low sulfur utilization and poor cycling stability are two major factors that currently impede the wide-spread commercialization of lithium-sulfur (Li-S) batteries. Herein, sulfur-rich side chains are anchored onto Schiff-base copolymer of thiourea aldehyde resin (cp (S-TAR)) nanosheets via inverse vulcanization to form a large number of intermolecular crosslinkers as well as mesopores. Application of the resultant copolymer as a cathode material in Li-S batteries can not only provide abundant porous channels for Li + diffusion but also significantly alleviate the dissolution of polysulfides by chemical confinement through the covalent bonds between sulfur-rich side chains and TAR. With this novel polymer cathode, a Li-S battery prototype is constructed which can operate at 1 C for over 500 charge-discharge cycles at nearly 99% coulombic efficiency, showing an ultralow cyclic fading rate of 0.045% per cycle, and an outstanding high-rate response of up to 5 C. The present strategy demonstrates the great potential of using highly crosslinked organosulfur copolymers as high-performance polymer cathode materials for low-cost, high-energy density Li-S batteries. [ABSTRACT FROM AUTHOR]
- Published
- 2018
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