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Thermodynamic properties of the lithium--silicon system. [Feasibility study]

Journal Article · · J. Electrochem. Soc.; (United States)
DOI:https://doi.org/10.1149/1.2132692· OSTI ID:7315449
;

The feasibility of using silicon as an alloying agent for the negative electrode in Li/FeS/sub 2/ cells was determined by studying cells of the type Li (liq) or 40 a/o Li--Al alloy (sol)/LiCl--KCl eutectic or LiF--LiCl--LiBr melts/Li (in solid Li--Si alloys at equilibrium). The Li--Si electrode was found reversible with respect to lithium between 650/sup 0/ and 725/sup 0/K. The nonstoichiometric ranges of the respective Li--Si compounds and electromotive forces (emf's) in the two-phase regions of the Li--Si phase diagram between 650/sup 0/ and 750/sup 0/K were measured. These studies indicated a new compound, Li/sub 21/Si/sub 8/, which was confirmed by x-ray diffraction, scanning electron microscope, and differential thermal analysis. The activities and relative partial molar properties of lithium and silicon in the two-phase regions of the phase diagram were calculated from the emf's in the temperature range 650/sup 0/ to 750/sup 0/K, and the standard free energy of formation for the compounds, Li/sub 2/Si, Li/sub 21/Si/sub 8/, Li/sub 15/Si/sub 4/, and Li/sub 22/Si/sub 5/, were also determined. 9 figures, 4 tables.

Research Organization:
General Motors Corp., Warren, MI
OSTI ID:
7315449
Journal Information:
J. Electrochem. Soc.; (United States), Journal Name: J. Electrochem. Soc.; (United States) Vol. 123:12; ISSN JESOA
Country of Publication:
United States
Language:
English

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Related Subjects

25 ENERGY STORAGE
250903* -- Energy Storage-- Batteries-- Materials
Components
& Auxiliaries
36 MATERIALS SCIENCE
360102 -- Metals & Alloys-- Structure & Phase Studies
ALLOYS
ANODES
DIAGRAMS
ELECTRIC BATTERIES
ELECTROCHEMICAL CELLS
ELECTRODES
ELECTROMOTIVE FORCE
ENERGY
ENERGY STORAGE SYSTEMS
ENTHALPY
ENTROPY
FEASIBILITY STUDIES
FREE ENERGY
HIGH TEMPERATURE
INTERMETALLIC COMPOUNDS
LITHIUM ALLOYS
LITHIUM-SULFUR BATTERIES
METAL-NONMETAL BATTERIES
PHASE DIAGRAMS
PHYSICAL PROPERTIES
SILICON ALLOYS
THERMODYNAMIC PROPERTIES