Solid State Multinuclear Magnetic Resonance Investigation of Electrolyte Decomposition Products on Lithium Ion Electrodes

J H S R DeSilva; V Udinwe; P J Sideris; M C Smart; F C Krause; C Hwang; K A Smith; S G Greenbaum

doi:10.1149/1.4717978

Solid State Multinuclear Magnetic Resonance Investigation of Electrolyte Decomposition Products on Lithium Ion Electrodes

ECS Trans. 2012;41(41):207-214. doi: 10.1149/1.4717978.

Authors

J H S R DeSilva^{1

2}, V Udinwe¹, P J Sideris¹, M C Smart³, F C Krause³, C Hwang³, K A Smith³, S G Greenbaum^{1

2}

Affiliations

¹ Department of Physics and Astronomy, Hunter College of CUNY, New York, New York 10065, USA.
² Graduate Center of CUNY, New York, New York, 10016, USA.
³ Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California 91109, USA.

Abstract

Solid electrolyte interphase (SEI) formation in lithium ion cells prepared with advanced electrolytes is investigated by solid state multinuclear (⁷Li, ¹⁹F, ³¹P) magnetic resonance (NMR) measurements of electrode materials harvested from cycled cells subjected to an accelerated aging protocol. The electrolyte composition is varied to include the addition of fluorinated carbonates and triphenyl phosphate (TPP, a flame retardant). In addition to species associated with LiPF₆ decomposition, cathode NMR spectra are characterized by the presence of compounds originating from the TPP additive. Substantial amounts of LiF are observed in the anodes as well as compounds originating from the fluorinated carbonates.

Abstract

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