High-Performance Li-S Batteries

High-Performance Li-S Batteries

highly efficient multifunctional polyvinylidene fluoride// carbon-molybdenum disulfide (PVDF//C-MoS2) interlayer is developed by direct deposition on sulfur cathode through facile slide coating method for Li@S batteries. The as-developed PVDF//C–MoS2 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-MoS2) 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 mAhg@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.

Journal Name: ChemistrySelect

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