Abstract
Solid-state (7)Li and (13)C MAS NMR spectra of cycled graphitic Li-ion anodes demonstrate SEI compound formation upon lithiation that is followed by changes in the SEI upon delithiation. Solid-state (13)C DPMAS NMR shows changes in peaks associated with organic solvent compounds (ethylene carbonate and dimethyl carbonate, EC/DMC) upon electrochemical cycling due to the formation of and subsequent changes in the SEI compounds. Solid-state (13)C NMR spin-lattice (T1) relaxation time measurements of lithiated Li-ion anodes and reference poly(ethylene oxide) (PEO) powders, along with MALDI-TOF mass spectrometry results, indicate that large-molecular-weight polymers are formed in the SEI layers of the discharged anodes. MALDI-TOF MS and NMR spectroscopy results additionally indicate that delithiated anodes exhibit a larger number of SEI products than is found in lithiated anodes.
Keywords
Mass spectrometryMaterials scienceAnalytical Chemistry (journal)Nuclear magnetic resonance spectroscopyIonSpectroscopySolid-stateSolid-state nuclear magnetic resonanceNuclear magnetic resonancePhysical chemistryChemistryChromatographyOrganic chemistryPhysics
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Publication Info
- Year
- 2015
- Type
- article
- Volume
- 8
- Issue
- 1
- Pages
- 371-380
- Citations
- 61
- Access
- Closed
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Cite This
Laura A. Huff,
Hadi Tavassol,
Jennifer Esbenshade
et al.
(2015).
Identification of Li-Ion Battery SEI Compounds through <sup>7</sup>Li and <sup>13</sup>C Solid-State MAS NMR Spectroscopy and MALDI-TOF Mass Spectrometry.
ACS Applied Materials & Interfaces
, 8
(1)
, 371-380.
https://doi.org/10.1021/acsami.5b08902
Identifiers
- DOI
- 10.1021/acsami.5b08902