In Situ Interweaved High Sulfur Loading Li–S Cathode by Catalytically Active Metalloporphyrin Based Organic Polymer Binders. Issue 7 (19th December 2022)

• Record Type: Journal Article
• Authors: Yao, Xiaoman; Guo, Can; Song, Chunlei; Lu, Meng; Zhang, Yuluan; Zhou, Jie; Ding, Hui‐Min; Chen, Yifa; Li, Shun‐Li; Lan, Ya‐Qian
• Is Part Of: Advanced materials. Volume 35:Issue 7(2023)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-12-19
• Subjects: in situ interweaving strategy -- Li–S cathode -- lithium polysulfides -- metalloporphyrin -- polymer binder; Materials -- Periodicals; Chemical vapor deposition -- Periodicals; 620.11
• DOI: 10.1002/adma.202208846
• Languages: English
• ISSNs: 0935-9648

Abstract

Abstract: The elaborate design of powerful Li–S binders with extended‐functions like polysulfides adsorption/catalysis and Li + hopping/transferring in addition to robust adhesion‐property has remained a challenge. Here, an in situ cathode‐interweaving strategy based on metalloporphyrin based covalent‐bonding organic polymer (M‐COP, M = Mn, Ni, and Zn) binders is reported for the first time. Thus‐produced functional binders possess excellent mechanical‐strengths, polysulfides adsorption/catalysis, and Li + hopping/transferring ability. Specifically, the modulus of Mn‐COP can reach up to ≈54.60 GPa (≈40 times higher than poly(vinylidene fluoride)) and the relative cell delivers a high initial‐capacity (1027 mAh g ‐1, 1 C and 913 mAh g ‐1, 2 C), and excellent cycling‐stability for >1000 cycles even at 4 C. The utilization‐rate of sulfur can reach up to 81.8% and the electrodes based on these powerful binders can be easily scale‐up fabricated (≈20 cm in a batch‐experiment). Noteworthy, Mn‐COP based cell delivers excellent capacities at a high sulfur‐loading (8.6 mg cm ‐2 ) and low E/S ratio (5.8 µL mg ‐1 ). In addition, theoretical calculations reveal the vital roles of metalloporphyrin and thiourea‐groups in enhancing the battery‐performance. Abstract : An in situ cathode‐interweaving strategy based on metalloporphyrin organic polymer (M‐COP, M = Mn, Ni, and Zn) binders is proposed and excellent performance is achieved in Li–S battery.