Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 5, Issue 34, Pages 17889-17895Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7ta05145j
Keywords
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Funding
- National Natural Science Foundation of China [51622703]
- 973 Program [2015CB258400]
- Fundamental Research Funds for the Central Universities [2017KFKJXX001, 2015ZDTD030]
- National Thousand Talents Program of China
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The permeation of dissolved lithium polysulfides across the porous polyolefin-based commercial separator is a major hindrance for using lithium sulfur batteries (LSBs). In this work, the poly(vinylidene fluoride) (PVDF)-based gel polymer electrolyte (GPE) with a compact morphology to block polysulfide penetration is prepared using a simple solution-casting method, and the strategy of incorporating poly(ethylene oxide) and nano zirconium dioxide is applied to guarantee electrolyte uptake and Li+ mobility. Superior to the commercial separator with liquid electrolyte, the LSB assembled with additive-free GPE exhibits a high initial capacity of 1429 mA h g(-1), coulombic efficiency of 96% at 0.2C and improved rate performance. After 500 cycles at 1C, the LSB could still deliver a capacity of 847.2 mA h g(-1), with a low fading rate of 0.05%. The LSB with high sulfur loading (5.2 mg cm(-2)) could attain a high areal capacity of 4.6 mA h cm(-2). Results of scanning electron microscopy suggest that such a hybrid GPE could effectively protect the lithium anode from polysulfide corrosion. Therefore, this novel membrane of hybrid PVDF-based GPE provides a simple and effective method to establish high-performance LSBs.
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