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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

Weiwei Huang  and
James R. Akridge
Weiwei Huang
Affiliation:
Eveready Battery Company, Inc., 25225 Detroit Road, Westlake, OH 44145
James R. Akridge
Affiliation:
Eveready Battery Company, Inc., 25225 Detroit Road, Westlake, OH 44145
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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.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 548: Symposia EE – Solid State Ionics V , 1998 , 325
Copyright
Copyright © Materials Research Society 1999

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References

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