Polarization and Corrosion in Sodium/Sulfur Cells

Bones, R. J.; Markin, T. L.

doi:10.1149/1.2131248

Cited by 12 publications

(4 citation statements)

References 2 publications

(2 reference statements)

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“…and r ~_ pa/2 + Re~iA~IM~ [15] In the present case, the value of r need not be known. This great simplification is actually a consequence of assuming ai to be constant throughout the electrolyte.…”

Section: A~m~ : (Ire) -1" G(lr)mentioning

confidence: 96%

“…[31] to the solid electrolyte in the Na/Na2Sx battery is that the electrochemical condition of the polysulfide/electrolyte interface is usually not known. From the polarization studies of Bones and Markin (15) and the work of Breiter and Dunn (16), it would appear that the sulfur electrode/ electrolyte polarization is minimal for cells that are operating properly, i.e., no abnormal cell resistances. However, improPer cell operation or contamination products might reduce A~IM~ significantly, so that hV crit would he lowered.…”

Section: Application Of the Analysis To Sodium-beta Alumina Degradationmentioning

confidence: 99%

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Transport Number Gradients and Solid Electrolyte Degradation

Jonghe

1982

J. Electrochem. Soc.

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Ion conduction is considered through electrolytes containing an immobile gradient in the electronic/ionic transport number ratio. It is shown that internal deposition of the metal phase (reduced ions) can occur in such electrolytes during electrolysis. A "critical" applied voltage or current density can be formulated above which electrolyte fracture would be caused by the internally deposited material.Application of the analysis to the sodium-beta alumina type electrolytes leads to identification of factors that could contribute to electrolyte degradation.

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Section: A~m~ : (Ire) -1" G(lr)mentioning

confidence: 96%

Section: Application Of the Analysis To Sodium-beta Alumina Degradationmentioning

confidence: 99%

Transport Number Gradients and Solid Electrolyte Degradation

Jonghe

1982

J. Electrochem. Soc.

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“…Asymmetric charge transfer resistance with dc ionic current flow at the sodium/B'r-alumina interface has been reported by several workers (1)(2)(3)(4)(5)(6). Significant asymmetric polarization can be harmful to the efficiency of battery operation and is associated with early electrolyte failure.…”

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confidence: 93%

Oxygen Activity and Asymmetric Polarization at the Sodium/Beta″‐Alumina Interface

Mailhe

Visco

Jonghe

1987

J. Electrochem. Soc.

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Asymmetric polarization at the sodium/beta"-alumina interface during ionic charge transfer has been studied using cyclic voltammetry with Na/beta"-alumina/Na cells. It was found that contamination of the sodium electrode by oxygen, as 02 or H20, causes asymmetric polarization. Polarization is quite severe in the range of 150~176 and is attributed to the presence of an adsorbed oxide film. The adsorption/desorption behavior of the resistive film could be described by a simple Langmuir model. Asymmetric polarization can be eliminated by lowering the oxide content of the sodium electrode to levels such that adsorption is negligible. This is achieved by the use of carefully dried electrolyte tubes with either electrolytically generated sodium, or sodium from which the oxygen has been scavenged with Ti sponge.

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“…Calcium fluoride has proven to be a useful solid electrolyte for high temperature emf studies (1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20). A review has been given by Tretyakov and Kaul (21).…”

mentioning

confidence: 99%