Circuit filling factor (CFF) for multiply tuned probes, revisited

Conradi, Mark S.; Zens, A. P.

doi:10.1016/j.jmr.2018.05.008

Cited by 5 publications

(1 citation statement)

References 7 publications

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“…S2. The circuit is implemented as a basic double-resonance design featuring two capacitive elements (C1 and C2) and two inductive elements (L1 and L2), leveraging principles for efficient tuned circuit design ( 50 ). The capacitive elements are fixed in parallel with a trimmer.…”

Section: Methodsmentioning

confidence: 99%

NMR spectroscopy of coin cell batteries with metal casings

et al. 2021

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Battery cells with metal casings are commonly considered incompatible with nuclear magnetic resonance (NMR) spectroscopy because the oscillating radio-frequency magnetic fields ("rf fields") responsible for excitation and detection of NMR active nuclei do not penetrate metals. Here, we show that rf fields can still efficiently penetrate nonmetallic layers of coin cells with metal casings provided "B 1 damming" configurations are avoided. With this understanding, we demonstrate noninvasive high-field in situ 7 Li and 19 F NMR of coin cells with metal casings using a traditional external NMR coil. This includes the first NMR measurements of an unmodified commercial off-the-shelf rechargeable battery in operando, from which we detect, resolve, and separate 7 Li NMR signals from elemental Li, anodic -LiAl, and cathodic Li x MnO 2 compounds. Real-time changes of -LiAl lithium diffusion rates and variable -LiAl 7 Li NMR Knight shifts are observed and tied to electrochemically driven changes of the -LiAl defect structure.

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Section: Methodsmentioning

confidence: 99%