Solid electrolyte interphase on graphite Li-ion battery anodesstudied by soft X-ray spectroscopy
We have measured X-ray absorption and emission near the C 1s edge of graphite electrodes cycled in lithium-ion battery cells. Resonantly excited emission spectra of graphite electrodes exhibit features characteristic of both highly oriented pyrolytic graphite as well as polycrystalline graphite. Spectra of three electrodes cycled in two different electrolytes are presented and compared with spectra of the pristine electrode. A solid electrolyte interphase (SEI) was detected on the electrochemically cycled electrodes. By the use of selective excitation, resonant X-ray emission spectra of the SEI-species were obtained and compared to spectra of reference compounds. The SEI on the cycled graphite anode was shown to comprise lithium oxalate (Li2C2O4), lithium succinate (LiO2CCH2CH2CO2Li) and lithium methoxide (LiOCH3).
- Research Organization:
- Ernest Orlando Lawrence Berkeley NationalLaboratory, Berkeley, CA (US)
- Sponsoring Organization:
- USDOE Director. Office of Science. Basic Energy Sciences.Chemical Sciences Geosciences and Biosciences Division; Swedish NationalScience Foundation, Uppsala University. Uppsala Sweden, Swedish NaturalScience Research Council, Goran Gustafsson Foundation for Research inNatural Science and Medicine
- DOE Contract Number:
- AC02-05CH11231
- OSTI ID:
- 882255
- Report Number(s):
- LBNL--54733; BnR: KC0204016
- Journal Information:
- Physical Chemistry Chemical Physics, Journal Name: Physical Chemistry Chemical Physics Journal Issue: 16 Vol. 6; ISSN 1463-9076
- Country of Publication:
- United States
- Language:
- English
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