Alkali metal ion-poly (ethylene oxide) complexes. II. Effect of cation on conductivity

E. A. Rietman; M. L. Kaplan; R. J. Cava

doi:10.1016/0167-2738(87)90176-7

Alkali metal ion-poly (ethylene oxide) complexes. II. Effect of cation on conductivity

E. A. Rietman, M. L. Kaplan, R. J. Cava

Research output: Contribution to journal › Article › peer-review

39 Scopus citations

Abstract

Complexes of alkali metal salts with various polymers have for some time been recognized as fast ionic conductors. Polymer electrolyte fast ion conductors are currently under consideration for use in high energy density electrochemical cells. In order to aid in our understanding of the mechanism of ionic conductivity we have examined systematically complexes of poly(ethylene oxide) (PEO) with the alkali metal salt series of Li⁺, Na⁺, K⁺, Rb⁺ and Cs⁺ with both tetraflouroborate (BF₄^-) and trifluoromethanesulfonate (CF₃SO₄^-) anions. The ratio of monomer to salt was 10:1 in all cases. Complex impedance measurements were made on all samples in the temperature range 40°-125°C. With CF₃SO₄^- as the anion a definite trend was apparent with the smallest cation Li⁺ being the worst conductor and Cs⁺, the largest cation, being the best. When BF₄^- salts are used, the Na⁺ complex is found to be the best conductor and Rb⁺ the worst. This study, in connection with our earlier studies, has shown that synergy between cation and anion in the polymer matrix is an important consideration in determining the ionic conductivity.

Original language	English (US)
Pages (from-to)	41-44
Number of pages	4
Journal	Solid State Ionics
Volume	25
Issue number	1
DOIs	https://doi.org/10.1016/0167-2738(87)90176-7
State	Published - Oct 1987
Externally published	Yes

All Science Journal Classification (ASJC) codes

General Chemistry
General Materials Science
Condensed Matter Physics

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title = "Alkali metal ion-poly (ethylene oxide) complexes. II. Effect of cation on conductivity",

abstract = "Complexes of alkali metal salts with various polymers have for some time been recognized as fast ionic conductors. Polymer electrolyte fast ion conductors are currently under consideration for use in high energy density electrochemical cells. In order to aid in our understanding of the mechanism of ionic conductivity we have examined systematically complexes of poly(ethylene oxide) (PEO) with the alkali metal salt series of Li+, Na+, K+, Rb+ and Cs+ with both tetraflouroborate (BF4-) and trifluoromethanesulfonate (CF3SO4-) anions. The ratio of monomer to salt was 10:1 in all cases. Complex impedance measurements were made on all samples in the temperature range 40°-125°C. With CF3SO4- as the anion a definite trend was apparent with the smallest cation Li+ being the worst conductor and Cs+, the largest cation, being the best. When BF4- salts are used, the Na+ complex is found to be the best conductor and Rb+ the worst. This study, in connection with our earlier studies, has shown that synergy between cation and anion in the polymer matrix is an important consideration in determining the ionic conductivity.",

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AU - Rietman, E. A.

AU - Kaplan, M. L.

AU - Cava, R. J.

PY - 1987/10

Y1 - 1987/10

N2 - Complexes of alkali metal salts with various polymers have for some time been recognized as fast ionic conductors. Polymer electrolyte fast ion conductors are currently under consideration for use in high energy density electrochemical cells. In order to aid in our understanding of the mechanism of ionic conductivity we have examined systematically complexes of poly(ethylene oxide) (PEO) with the alkali metal salt series of Li+, Na+, K+, Rb+ and Cs+ with both tetraflouroborate (BF4-) and trifluoromethanesulfonate (CF3SO4-) anions. The ratio of monomer to salt was 10:1 in all cases. Complex impedance measurements were made on all samples in the temperature range 40°-125°C. With CF3SO4- as the anion a definite trend was apparent with the smallest cation Li+ being the worst conductor and Cs+, the largest cation, being the best. When BF4- salts are used, the Na+ complex is found to be the best conductor and Rb+ the worst. This study, in connection with our earlier studies, has shown that synergy between cation and anion in the polymer matrix is an important consideration in determining the ionic conductivity.

AB - Complexes of alkali metal salts with various polymers have for some time been recognized as fast ionic conductors. Polymer electrolyte fast ion conductors are currently under consideration for use in high energy density electrochemical cells. In order to aid in our understanding of the mechanism of ionic conductivity we have examined systematically complexes of poly(ethylene oxide) (PEO) with the alkali metal salt series of Li+, Na+, K+, Rb+ and Cs+ with both tetraflouroborate (BF4-) and trifluoromethanesulfonate (CF3SO4-) anions. The ratio of monomer to salt was 10:1 in all cases. Complex impedance measurements were made on all samples in the temperature range 40°-125°C. With CF3SO4- as the anion a definite trend was apparent with the smallest cation Li+ being the worst conductor and Cs+, the largest cation, being the best. When BF4- salts are used, the Na+ complex is found to be the best conductor and Rb+ the worst. This study, in connection with our earlier studies, has shown that synergy between cation and anion in the polymer matrix is an important consideration in determining the ionic conductivity.

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Alkali metal ion-poly (ethylene oxide) complexes. II. Effect of cation on conductivity

Abstract

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