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Multifunctional Cathodic Interlayer with Polysulfide Immobilization Mechanism for High‐Performance Li‐S Batteries
Author(s) -
Waqas Muhammad,
Manzoor Soomro Afaque,
Ali Shamshad,
Kumar Suresh,
Chan Sattar,
Hussain Kashif,
Hussain Memon Fida,
Ahmed Shaikh Shoaib
Publication year - 2020
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.202003381
Subject(s) - polysulfide , cathode , materials science , sulfur , chemical engineering , coating , adsorption , molybdenum disulfide , microstructure , molybdenum , composite number , cathodic protection , composite material , anode , metallurgy , electrode , chemistry , electrolyte , organic chemistry , engineering
A highly efficient multifunctional polyvinylidene fluoride // carbon‐molybdenum disulfide (PVDF // C‐MoS 2 ) interlayer is developed by direct deposition on sulfur cathode through facile slide coating method for Li−S batteries. The as‐developed PVDF // C–MoS 2 interlayer exhibits the polysulfide adsorption and trapping capabilities, which reduces the shuttling effects and also slows down the self‐discharge in Li−S batteries. The first composite layer (C‐MoS 2 ) on the cathode maximizes the level of lithium polysulfide adsorption owing to the strong dipolar interaction of Mo−S on the polarized surface of polysulfide species. Moreover, the PVDF layer physically traps/capture the remaining polysulfide species with its interconnected microstructure for the reutilization as active material in the cathode. The Li−S batteries based on interlayers deliver the discharge capacity of 1086 mAh g −1 at 1 C with 3.0 mg cm −2 sulfur loading and show capacity decay of 0.04 % per cycle after 1500 cycles. In contrast, the Li−S batteries without interlayer merely maintain the discharge capacities of 423 mAh g −1 at 1 C with 3.0 mg cm −2 sulfur loading and show severe capacity decay ( 0.12 % ) after 505 cycles. The Li−S batteries also depict the remarkable cyclic performances with as‐developed interlayer for high sulfur loading cathodes and efficiently slowdowns the self‐discharge even after resting for a long time.