Studies of lithium ion dynamics in paramagnetic cathode materials using (6)Li 1D selective inversion methods

Solid State Nuclear Magnetic Resonance
L J M DavisG R Goward

Abstract

The effectiveness of two different selective inversion methods is investigated to determine timescales of Li ion mobility in paramagnetic Li intercalation materials. The first method is 1D exchange spectroscopy, which employs a 90°-τ(1)-90° sequence for selective inversion of a Li resonance undergoing site exchange. The experiment is most easily applied when the first delay period, τ(1), is set to the frequency difference between two resonances undergoing ion exchange. This enables the determination of ion hopping timescales for single exchange pair systems only. To measure ion dynamics in systems having more than one exchange process, a second selective inversion method was tested on two paramagnetic Li intercalation materials. This second technique, replaces the 90°-τ(1)-90° portion of 1D EXSY with a long, selective shaped pulse (SP). Two paramagnetic solid-state materials, which are both cathode materials for lithion ion batteries, were chosen as model compounds to test the effectiveness of both the selective inversion methods. The first compound, Li(2)VPO(4)F, was chosen as it hosts two Li sites with 1-exchange process. The second model compound is a 3-site, 3-exchange process system, Li(2)VOPO(4). For the 2-site material, ...Continue Reading

Citations

Jun 28, 2018·Chemical Communications : Chem Comm·Carrie SiuM Stanley Whittingham
Apr 23, 2013·Journal of Physics. Condensed Matter : an Institute of Physics Journal·V EppM Wilkening
Dec 24, 2013·Physical Chemistry Chemical Physics : PCCP·T L SpencerG R Goward

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