In situ spectroscopic applications to the study of rechargeable lithium batteries. Final report
- Case Western Reserve Univ., Cleveland, OH (United States). Dept of Chemistry
In situ attenuated total reflection Fourier transform infrared spectroscopy (ATR/FTIR) has been employed to examine the reactivity of lithium toward polyethylene oxide (PEO) at ca. 60{degree}C. Uncertainties regarding the cleanliness of the Li surfaces were, minimized by electrodepositing a film of metallic Li directly onto a thin layer of gold (ca. 60 {Angstrom}) vapor deposited on a Ge ATR optical element during the spectroscopic measurements. The ATR/FTIR features observed upon stripping the Li layer were consistent with the formation of alkoxide-type moieties resulting from the Li-induced cleavage of the ether-type functionalities. Electronic and structural aspects of the electrochemical insertion of lithium from non-aqueous electroyltes into FeS{sub 2} have been investigated using in situ Fe K-edge X-ray absorption fine structure (XAFS). The results obtained indicate that the incorporation of Li{sup +} in the pyrite lattice brings about a marked decrease in the amplitude of the extended XAFS (EXAFS) oscillations, particularly for shells associated with distant atoms and a rounding of the, X-ray absorption near edge structure (XANES) region. An analysis of the EXAFS spectra yielded a value for the FeS distance of 2.29 {plus_minus} 0.02 {Angstrom}. On this basis and additional in situ room temperature {sup 57}Fe Mossbauer effect spectroscopy data for the same system it has been proposed that the electrically formed material involves a highly disordered (possibly amorphous) form of Fe{sub l-x}S (with Li+ counterbalancing the charge).
- Research Organization:
- Case Western Reserve Univ., Cleveland, OH (United States). Dept. of Chemistry; Lawrence Berkeley Lab., CA (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 10105605
- Report Number(s):
- LBL--34514; ON: DE94003478
- Country of Publication:
- United States
- Language:
- English
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Conference
·
Mon Dec 30 23:00:00 EST 1996
·
OSTI ID:459348
Electrochemical insertion of lithium into pyrite from nonaqueous electrolytes at room temperature. An in situ Fe K-edge X-ray absorption fine structure study
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Wed Mar 15 23:00:00 EST 1995
· Journal of Physical Chemistry
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OSTI ID:35467
In situ X-ray absorption fine structure studies of foreign metal ions in nickel hydrous oxide electrodes in alkaline electrolytes
Journal Article
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Thu Oct 06 00:00:00 EDT 1994
· Journal of Physical Chemistry; (United States)
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OSTI ID:7070767
Related Subjects
25 ENERGY STORAGE
250903
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400102
ABSORPTION SPECTROSCOPY
CHEMICAL AND SPECTRAL PROCEDURES
CHEMICAL REACTION KINETICS
ELECTRODES
EMISSION SPECTROSCOPY
IRON SULFIDES
LITHIUM
LITHIUM-SULFUR BATTERIES
MATERIALS
MATERIALS, COMPONENTS, AND AUXILIARIES
POLYETHYLENES
PROGRESS REPORT
SOLID ELECTROLYTES
250903
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400102
ABSORPTION SPECTROSCOPY
CHEMICAL AND SPECTRAL PROCEDURES
CHEMICAL REACTION KINETICS
ELECTRODES
EMISSION SPECTROSCOPY
IRON SULFIDES
LITHIUM
LITHIUM-SULFUR BATTERIES
MATERIALS
MATERIALS, COMPONENTS, AND AUXILIARIES
POLYETHYLENES
PROGRESS REPORT
SOLID ELECTROLYTES