In Situ Raman Spectroscopic Studies of the Rechargeable Low Temperature Molten Salt Cell: Na/Beta″‐Alumina/S(IV) in

Tanemoto, Kei; Katagiri, A.; Mamantov, G.

doi:10.1149/1.2119851

Cited by 4 publications

(3 citation statements)

References 10 publications

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“…As expected from the ratio of the n-values, the ratio of the number of coulombs in the first to the second plateau was found to be ,~2, indicating the formation of sulfur in the --2 state. Recent Raman spectroscopic studies (10,11) have shown that sulfide in acidic melts is present as oligomeric A1SC1. The overall reaction corresponding to the second discharge plateau can be written in simplified form as 2Na…”

Section: Resultsmentioning

confidence: 99%

Two‐Plateau Rechargeable Sodium/Sulfur(IV) Molten Chloroaluminate Cell

Mamantov

Tanemoto

Ogata

1983

J. Electrochem. Soc.

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The behavior of the rechargeable cellnormalNa/β″‐normalalumina/SCl3+ in molten AlCl3‐normalNaClunder conditions in which S(IV) is reduced to S(−2) is described. It is shown that the use of reticulated vitreous carbon as the positive current collector and high concentrations of active material result in cells which operate at temperatures ≤220°C and have very high energy densities (>450 W‐hr/kg).

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Section: Resultsmentioning

confidence: 99%

Two‐Plateau Rechargeable Sodium/Sulfur(IV) Molten Chloroaluminate Cell

Mamantov

Tanemoto

Ogata

1983

J. Electrochem. Soc.

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“…Open-circuit voltage for this step in the basic melt is 2.75V. Chemistry and electrochemistry of several sulfur species in A1CI:~-NaC1 melts of different compositions have been studied in our group (7)(8)(9)(10)(11)(12) and elsewhere (13)(14)(15)(16). As is apparent from Eq.…”

Section: Discharge 2na + S + A1c13 ~ ~ A1sc1 + 2nac1 [2] Chargementioning

confidence: 99%

“…[1], the modified Lewis acidity of the positive electrode mix decreases in the course of discharge. Since SCI:~ § is stable only in acidic melts (mole percent (m/o) of A1CI:~ > 50) (10), the positive electrode mix must remain acidic as long as some tetravalent sulfur is present in the melt (11). However, the positive electrode mix can become basic when the formal oxidation state of sulfur (FOXS) is + 1 or less.…”

Section: Discharge 2na + S + A1c13 ~ ~ A1sc1 + 2nac1 [2] Chargementioning

confidence: 99%

A Study of Polarization at the β″‐Alumina Interfaces in the Rechargeable Sodium/Sulfur(IV) Molten Chloroaluminate Cell

Katagiri

Hvistendahl

Shimakage

et al. 1986

J. Electrochem. Soc.

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Polarization phenomena at β″‐alumina interfaces have been investigated in the rechargeable cell, Na/β″‐alumina/ S(IV) in molten AlCl3/normalNaCl , at ∼200°C, using cells equipped with β″‐alumina disks. It was found that most of the polarization occurred at the β″‐alumina/molten salt interface; it was dependent on the initial melt composition. The polarization could be reduced significantly by a predischarge of the cell containing equimolar AlCl3‐normalNaCl melt and elemental sulfur in the positive electrode compartment.

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