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• W3160084725 endingPage "130316" @default.
• W3160084725 startingPage "130316" @default.
• W3160084725 abstract "• Organosulfur copolymers with high sulfur content were prepared by S N Ar. • Semi-ionic C–F bonds in PTFHQS can diminish the shuttle effect in Li–S batteries. • Organosulfur cathodes show high discharge capacity and high Coulombic efficiency. Organosulfur copolymers are promising cathode materials in lithium–sulfur batteries because of adjustable molecular structure, tunable electrochemical properties and excellent processability. However, conventional organosulfur copolymers suffer from poor electronic/ionic conductivity and low sulfur content, which limit rate capability and energy density. Herein, fluorinated quinone-derived organics are copolymerized with sulfur via convenient nucleophilic aromatic substitution (S N Ar) reaction. The homogeneous distribution of sulfur over poly(tetrafluorohydroquinone)-sulfur (PTFHQS) at molecular level endows excellent Li + ion diffusivity and fast redox kinetics. The abundant semi-ionic C–F bonds with polar characteristic have strong interactions with polysulfides, thus diminishing the shuttle effect. In result, flexible PTFHQS cathode with ~ 71 wt% sulfur content exhibits high discharge capacity of 643 mAh g total –1 (906 mAh g sulfur –1 ) at 0.5C, stable Coulombic efficiency (>99%), good rate performance of 307 mAh g total –1 (432 mAh g sulfur –1 ) 2.0C, excellent cycling stability (capacity retention of 87% for 600cycles), and functions normally at elevated working temperature (80 °C). Compared to another copolymer of sulfurized tetrafluoro-p-benzoquinone monomer (TFBQS), molecular structure characterization and electrochemical analysis verifies that pre-polymerized skeleton of PTFHQS is conducive to the homogeneous distribution and efficient utilization of sulfur species. We expect this work will bring inspiration to exploit organosulfur compounds with rational molecular structures and convenient synthesis routes for lithium–sulfur batteries." @default.
• W3160084725 created "2021-05-24" @default.
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• W3160084725 date "2021-11-01" @default.
• W3160084725 modified "2023-10-06" @default.
• W3160084725 title "Fluorinated quinone derived organosulfur copolymer cathodes for long-cycling, thermostable and flexible lithium–sulfur batteries" @default.
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• W3160084725 doi "https://doi.org/10.1016/j.cej.2021.130316" @default.
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