In Situ Interweaved High Sulfur Loading Li-S Cathode by Catalytically Active Metalloporphyrin Based Organic Polymer Binders.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 36444853.
- Also identified by DOI 10.1002/adma.202208846.
- No licence information is recorded for this record.
- Because redistribution is not established, this page shows the abstract only. Follow the links below for the full text.
Abstract
The elaborate design of powerful Li-S binders with extended-functions like polysulfides adsorption/catalysis and Li<sup>+</sup> 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<sup>+</sup> 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<sup>-1</sup> , 1 C and 913 mAh g<sup>-1</sup> , 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<sup>-2</sup> ) and low E/S ratio (5.8 µL mg<sup>-1</sup> ). In addition, theoretical calculations reveal the vital roles of metalloporphyrin and thiourea-groups in enhancing the battery-performance.