Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 13, Issue 5, Pages 6229-6240Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c19725
Keywords
melamine foam; MoS2; electrocatalyst; sulfur loading; Li-S batteries
Funding
- NSAF Joint Foundation of China [U1630126]
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The use of annealed melamine foam loaded 2H/1T MoS2 as a multifunctional interlayer in Li-S batteries effectively inhibits the shuttle effect, improves redox kinetics, and reduces charge-discharge polarization, leading to higher energy density and cycling performance.
Lithium-sulfur (Li-S) batteries featuring high-energy densities are identified as a hopeful energy storage system but are strongly impeded by shuttle effect and sluggish redox chemistry of sulfur cathodes. Herein, annealed melamine foam loaded 2H/1T MoS2 (CF@2H/lT MoS2) is prepared as a multifunctional interlayer to inhibit the shuttle effect, improve redox kinetics, and reduce the charge-discharge polarization of Li-S batteries. The CF@2H/1T MoS2 becomes fragmented structures after assembling the cell, which not only benefits to adsorb and catalyze LiPSs but also to significantly buffer the volume expansion due to a large number of gaps between fragmented structures. Meanwhile, the batteries based on CF@2H/1T MoS, interlayer delivers high areal capacity of 5.1 mAh cm(-2) under high sulfur mass loading of 7.6 mg cm(-1) at 0.2 C. Importantly, the experiments of in situ Raman spectra demonstrate that the CF@2H/1T MoS2 can obviously inhibit the shuttle effect by effectively adsorbing and catalyzing LiPSs. This novel design idea and low-cost melamine foam raw material open up a new way for the application of high-energy density Li-S batteries.
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