Multiple Covalent Triazine Frameworks with Strong Polysulfide Chemisorption for Enhanced Lithium‐Sulfur Batteries. Issue 10 (27th May 2019)

• Record Type: Journal Article
• Authors: Wang, De‐Gao; Tan, Lei; Wang, Huan; Song, Min; Wang, Jiexi; Kuang, Gui‐Chao
• Is Part Of: ChemElectroChem. Volume 6:Issue 10(2019)
• Page Start: 2777
• Page End: 2781
• Publication Date: 2019-05-27
• Subjects: lithium-sulfur batteries -- fluorinated sulfur-rich multiple covalent triazine frameworks -- affinity -- polysulfides; Electrochemistry -- Periodicals; 541.37
• DOI: 10.1002/celc.201900467
• Languages: English
• ISSNs: 2196-0216

Abstract

Abstract: Endowed with high theoretical energy density, low cost, and environmental friendliness, lithium‐sulfur batteries have a promising future in energy storage. The volume expansion of the sulfur cathode, shuttle effects, and the insulating nature of polysulfide result in poor cycling stability and limit practical applications of lithium‐sulfur batteries. In this work, these matters are relieved by physically and chemically restricting sulfur species in highly fluorinated sulfur‐rich multiple covalent triazine frameworks synthesized through nucleophilic aromatic substitution reaction chemistry. It exhibits a specific capacity of 681 mAh g −1 and capacity retention of 62.6 % after 400 cycles, indicating a 0.09 % degradation per cycle. The superiority in cycle performance is attributed to the homogeneous distribution of sulfur, covalent bonding of sulfur, and affinity for polysulfide of triazine rings. Abstract : In the ring : A porous fluorinated sulfur‐rich multiple covalent triazine framework (FMCTF‐S) is synthesized through nucleophilic aromatic substitution. The organic polymer with multiple polysulfide‐affinitive triazine rings serves as the host for sulfur. Sulfur is distributed homogeneously throughout the framework and the triazine units. FMCTF‐S delivered a capacity of 681 mAh g −1 after 400 cycles with 0.09 % degradation per cycle at 1 C.