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Performance Characteristics of Gel Polymer Electrolyte Separators in Rechargeable Lithium Ion Cells
Published online by Cambridge University Press: 10 February 2011
Abstract
The swelling behavior of poly(vinylidene fluoride-hexafluoropropylene), noted as P(VdF- HFP), was under various conditions. Increasing the HFP unit content in P(VdF-HFP) and temperature increased the swelling degree of the polymers considerably. The amount of the electrolyte solution absorbed by P(VdF-HFP) at room temperature showed the following trend: DMC>EC/DMC>DEC≈EC/DEC. The presence of LiPF6 in carbonate solvents did not affect on the swelling degree of PVdF and P(VdF-8%IIFP) in all solutions studied but lowered the swelling degree of P(VdF-15%HFP) in DMC, EC/DEC and EC/DMC/DEC solution at room temperature or prevented it from dissolution in the them at 55°C. A variable search experiment indicated that changing the pre-conditioning temperature from 21 to 55°C is more effective than other changes considered in the experiment for increasing high rate discharge capability. Some coins cells using the composite GPE separators had higher discharge capability than those using microporous polyethylene separators.
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- Copyright © Materials Research Society 1999
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