Transference number calculations for sodium polysulfides

Journal Article · Fri Jul 01 00:00:00 EDT 1988 · J. Electrochem. Soc.; (United States)

DOI:https://doi.org/10.1149/1.2096103· OSTI ID:7020603

Risch, T; Newman, J

Transference numbers of sodium cations and sulfur anions in sodium polysulfide melts are calculated from previously determined experimental data. Concentrated electrolyte theory assuming a binary electrolyte consisting of sodium anions, sulfide cations, in a neutral sulfur solvent is used to relate the transference numbers to fundamental solution transport properties. Slopes of open-circuit potential measurements vs. melt composition on sodium-sulfur cells with and without transference are used to determine the sulfur anion and sodium cation transference numbers. The transference number of sodium cations is calculated from previous experimental data for two temperatures, 573 and 633 K, and range from 0.88 to 0.93 for sodium sulfide mole fractions between 0.20 and 0.34. These values for transference numbers presented here are more accurate than previous interpretations of these data where unity sodium cation transference numbers were assumed. The results of this work are shown to be important in the design of sodium-sulfur cells.

• Research Organization: Acurex Corp., Aerotherm Div., Mountain View, CA (US)
• OSTI ID: 7020603
• Journal Information: J. Electrochem. Soc.; (United States), Vol. 135:7
• Country of Publication: United States
• Language: English

Related Subjects

25 ENERGY STORAGE
30 DIRECT ENERGY CONVERSION
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
ELECTROCHEMICAL CELLS
DESIGN
ELECTROLYTES
BINARY MIXTURES
SODIUM SULFIDES
ELECTROCHEMISTRY
SULFUR
SOLVENT PROPERTIES
CALCULATION METHODS
DATA ANALYSIS
EXPERIMENTAL DATA
HIGH TEMPERATURE
THEORETICAL DATA
THERMODYNAMICS
ALKALI METAL COMPOUNDS
CHALCOGENIDES
CHEMISTRY
DATA
DISPERSIONS
ELEMENTS
INFORMATION
MIXTURES
NONMETALS
NUMERICAL DATA
SODIUM COMPOUNDS
SULFIDES
SULFUR COMPOUNDS
250901* - Energy Storage- Batteries- Design & Development
300505 - Fuel Cells- Electrochemistry
Mass Transfer & Thermodynamics
400201 - Chemical & Physicochemical Properties