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제125회 대한화학회 학술발표회 및 총회 Improving Lithium-Sulfur Battery Performances by Using Conjugative Porous Polymer as the Sulfur Support: the Case of N-containing Porous Aromatic Framework 41

2020년 2월 6일 09시 54분 31초
MAT.P-782 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
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Material Chemistry
저자 및
Qian Wang, Yongnan Zhao1,*, Young-Uk Kwon*, Ji Man Kim*
Department of Chemistry, Sungkyunkwan University, Korea
1 School of Material Science and Engineering, Tiangong University, China
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승인 1건
N-containing porous aromatic framework 41 (PAF-41) with hierarchical porous structure has been readily synthesized through AlCl3 catalysed Scholl reaction by using triphenylamine as the monomer. The extended skeleton of PAF-41 is constructed by N-bridged biphenyl groups to generate a consecutive conjugative electronic structure. The hierarchical porous skeleton and the presence of N atoms effectively confine the electroactive species by synergistic physisorption and chemisorption to alleviate the shuttle effect that is induced by the soluble polysulfides. These features render the sulfur impregnated PAF-41 (SPAF-41) improved lithium sulfur battery performances, especially the cycling stability. SPAF-41 composite cathode with high sulfur loading of 72 wt% exhibits enhanced rate capability and excellent cycling performance. The cell delivers a high capacity of 725.8 mAh g−1 at 0.5 C in the first cycle and sustains a reversible capacity of 491.4 mAh g−1 after 500 charge-discharge cycles. A low decay rate 0.06% per cycle is achieved. The well conductive PAF-41 support bestows the cell high Coulombic efficiency of 97.36%.