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Conductivity and Morphology of Hybrid Electrolytes Based on Blends of Pvdf With PEO-co-PPO Copolymers

Published online by Cambridge University Press:  10 February 2011

H.P. Wang ,
J. B. Kejha ,
Y.K. Yarovoy  and
S.L. Wunder
H.P. Wang
Affiliation:
Department of Chemistry, Temple University, Philadelphia, PA 19122
J. B. Kejha
Affiliation:
Lithium Technology Corporation, Plymouth Meeting, PA
Y.K. Yarovoy
Affiliation:
Department of Chemistry, Temple University, Philadelphia, PA 19122
S.L. Wunder
Affiliation:
Department of Chemistry, Temple University, Philadelphia, PA 19122
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Abstract

Hybrid film electrolytes with high room temperature conductivity have been prepared by casting solutions of PVDF-HFP copolymers with PEO-PPO block copolymers and PEO oligomers followed by activation of the polymer blend films in electrolyte solutions. The morphology and conductivity of these solid electrolytes were studied as a function of concentration, molecular weight and sequence order (in the case of PPO-co-PEO-co-PPO or PEO-co-PPO-co-PEO) of the PEO and PEO-PPO copolymers, and also of the casting solvent and evaporation rate of the casting solvent. Structural studies of PVDF-HFP/PEO and PVDF- HFP/PPO-co-PEO blend films (SEM, DSC) before activation with lithium salt electrolyte may indicate the occurrence of spinodal decomposition in the films during slow evaporation of the casting solvent. As a result of spinodal decomposition, an interpenetrating bi-continuous phase may evolve with microphase separation between PVDF-HFP and PPO-PEO phases, in which the PVDF phase provides mechanical support and the PPO-PEO phase pfovides a conductive path.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 548: Symposia EE – Solid State Ionics V , 1998 , 347
Copyright
Copyright © Materials Research Society 1999

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References

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