Influence of Sample History on the Morphology and Transport Properties of PEO−Lithium Salt Complexes

Autor:	Maritza Volel, Wladimir Gorecki, Michel Armand
Rok vydání:	2004
Předmět:	Polymers and Plastics Chemistry Diffusion SAMPLE history Organic Chemistry Inorganic chemistry Ionic bonding Conductivity Lithium perchlorate Inorganic Chemistry Solvent chemistry.chemical_compound Materials Chemistry Ionic conductivity Solvent effects
Zdroj:	Macromolecules. 37:8373-8380
ISSN:	1520-5835 0024-9297
DOI:	10.1021/ma0490404
Popis:	We provide clear evidence of the effect of the solvent used for sample preparation on the morphology and transport properties of PEO−lithium salt (LiTFSI, LiBF4, or LiClO4) complexes. The surface structure, thermal behavior, and conductivity of the films along with the measured diffusion coefficients and transport numbers of the ionic species are clearly different whether acetonitrile (good solvent of PEO) or methyl formate (poor solvent) was used. Interestingly, the samples with the lowest conductivity have the highest diffusion coefficients, indicative of a difference in carriers concentration. We infer that the polymer chains keep memory of the solvent, and their generated spatial organization is directly implied in conductivity through the use of specific pathways for ionic mobility. Since the variations observed here are of the same amplitude or greater than those observed for some deliberate modification of the polymer electrolytes (i.e., nanoparticles addition, mechanical strain, etc.), great care ...
Databáze:	OpenAIRE
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