Journal
JOURNAL OF MEMBRANE SCIENCE
Volume 454, Issue -, Pages 298-304Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.memsci.2013.12.016
Keywords
Gelled microporous polymer electrolyte; Organogelators; Leakage; Lithium-ion batteries
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Funding
- National Natural Science Foundation of China [51203055, 51210004, 21304036]
- China Postdoctoral Science Foundation [2012M511612]
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Gelled microporous polymer electrolyte (GMPE) was prepared by gelating the liquid phase in pores of poly(vinylidene fluoride) membrane with low molecular weight organogelator, 1,3:2,4-di-O-methylbenzylidene-D-sorbitol (MDBS). Effects of MDBS concentrations on liquid uptake, leakage and ionic conductivity of GMPEs were investigated. The results demonstrated that GMPE containing a certain amount of MDBS showed dramatic decrease in liquid leakage. In consideration of ionic conductivity combining with liquid leakage, the GMPE with 2.0 wt% of MDBS (GMPE-2.0) was used to do further evaluations including electrochemical stability, electrolyte/lithium metal electrode stability and charge/ discharge in details. The prepared GMPE-2.0 showed an electrochemical stability window of 4.7 V (vs. Li/Li Li+). Moreover, tests run on Li/GMPE-2.0/LiFePO4 cell showed better result in terms of discharge retention than that of cell using polymer electrolyte without MDBS (7.0% and 15.1% improvement of capacity retention after 100 cycles at discharge rate of 0.1C and 5C, respectively). These results showed that it was a promising method to prepare safe lithium-ion batteries with high durability and high performance for practical use. (C) 2013 Elsevier B.V. All rights reserved,
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