A microporous carbon derived from metal‐organic frameworks for long‐life lithium sulfur batteries. (13th December 2019)

• Record Type: Journal Article
• Authors: Li, Guochun; Jiang, Xiangli; Liu, Chang; Song, Mingchao; Yang, Shiliu; Lian, Jiabiao; Lee, Jim Yang
• Is Part Of: International journal of energy research. Volume 44:Number 3(2020)
• Page Start: 2126
• Page End: 2136
• Publication Date: 2019-12-13
• Subjects: electrolyte -- lithium sulfur batteries -- microporous carbon -- S/MC composites -- ZIF‐8; Power resources -- Periodicals; Power (Mechanics) -- Periodicals; Power resources -- Research -- Periodicals; 621.042
• DOI: 10.1002/er.5070
• Languages: English
• ISSNs: 0363-907X

Abstract

Summary: A polyhedral microporous carbon derived from metal‐organic frameworks (ZIF‐8) could present good property for sulfur loading and trapping. A melting‐evaporation route was adopted to synthesize two sulfur/microporous carbon (S/MC) composites, of which sulfur content is controllable, and ether‐based or ester‐based electrolytes were used to evaluate the synthesized composites for the lithium sulfur batteries. According to electrochemical results, the S/MC composite with 65.2 wt% S in the ether‐based electrolyte exhibited optimized performance as compared with the composite with 65.2 wt% S in the ester‐based electrolyte, as well as the composite with 58.6 wt% S in the two kinds of electrolytes. For the S/MC composite with 65.2 wt% S in ether‐based electrolyte, the initial discharge capacity could reach up to 1505.9 mAh g −1 and the reversible capacity could be 833.3 mAh g −1 after 40 cycles at 0.1 C. Furthermore, while being respectively evaluated at 0.5, 1.0, and 2.0 C, the discharge capacities could still maintain at 544, 493 and 354 mAh g −1 after 300, 500, and 800 cycles, demonstrating appreciable cyclic reversibility and rate capability. Abstract : A microporous carbon was facilely synthesized by using metal‐organic frameworks (ZIF‐8) as precursor. And two sulfur/microporous carbon (S/MC) composites with controllable sulfur content prepared via a two‐step heat treatment routes were used as cathode materials for lithium sulfur batteries. The electrochemical performances of the two S/MC composites were measured and compared in ester‐based electrolyte and ether‐based electrolyte, respectively. As a result, the S/MC composite with 65.2 wt% S demonstrated the optimal electrochemical performance in ether‐based electrolyte.