Journal
ACS OMEGA
Volume 5, Issue 14, Pages 8272-8282Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsomega.0c00666
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Funding
- Canada Research Chair (CRC) [230723]
- Natural Science and Engineering Research Council (NSERC) of Canada [477901-2015]
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Binder, as one of the key components, plays a crucial role in improving the capacity and cycling performance of lithium- sulfur (Li-S) batteries. In this work, commercially available, low-cost, water-soluble polyvinyl alcohol (PVA) has been systematically investigated as a functional polymer binder for high-sulfur-loading cathodes, with the aim of enhancing sulfur utilization, reducing capacity decay, and extending cycling life of the cathodes. In comparison with polyvinylidene fluoride as a conventional binder, PVA shows a valuable polysulfide entrapping ability and a much stronger binding strength. Its superior polysulfide entrapping ability has been verified through theoretical density functional theory calculations and an experimental ex situ adsorption study. In electrochemical Li-S battery performance evaluation, at a sulfur loading density of 3.5 mg cm(-2), the sulfur cathode assembled with the PVA binder displays at 0.5 C a very slow capacity decay of only 0.010% per cycle over 250 cycles. Additionally, the strong binding strength of PVA allows the fabrication of thick sulfur cathodes with a high sulfur loading density of 10.5 mg cm(-2) , which shows a high areal capacity of 4.0 mA h cm(-2) and a high cycling stability (capacity decay of 0.1% per cycle). In consideration of the superior capacity retention and cycling performance of its enabled cathodes, the cost-effective PVA is a promising candidate for highsulfur-loading cathodes in practical applications.
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