Solid-state STRAFI NMR probe for material imaging of quadrupolar nuclei

Tang, Joel A.; Zhong, Guiming; Dugar, Sneha; Kitchen, Jason A.; Yang, Yong; Fu, Riqiang

doi:10.1016/j.jmr.2012.10.009

Cited by 15 publications

(10 citation statements)

References 73 publications

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“…The formation of dendrites makes this class of batteries potentially unsafe and impractical owing to the risk of fire and explosion . NMR spectroscopy and MRI are used to provide real‐time visualization of dendrite growth.…”

Section: Interfaces In Materials For Lithium Batteriesmentioning

confidence: 99%

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Understanding Surface and Interfacial Chemistry in Functional Nanomaterials via Solid‐State NMR

et al. 2017

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Surface and interfacial chemistry is of fundamental importance in functional nanomaterials applied in catalysis, energy storage and conversion, medicine, and other nanotechnologies. It has been a perpetual challenge for the scientific community to get an accurate and comprehensive picture of the structures, dynamics, and interactions at interfaces. Here, some recent examples in the major disciplines of nanomaterials are selected (e.g., nanoporous materials, battery materials, nanocrystals and quantum dots, supramolecular assemblies, drug-delivery systems, ionomers, and graphite oxides) and it is shown how interfacial chemistry can be addressed through the perspective of solid-state NMR characterization techniques.

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Section: Interfaces In Materials For Lithium Batteriesmentioning

confidence: 99%

“…MRI can be particularly powerful to study dendrite growth, as it provides both chemical and spatial information . Chandrashekar et al demonstrated two‐ and three‐dimensional 7 Li MRI and magnetic‐resonance chemical‐shift imaging (CSI) of batteries ( Figure ).…”

Section: Interfaces In Materials For Lithium Batteriesmentioning

confidence: 99%

Understanding Surface and Interfacial Chemistry in Functional Nanomaterials via Solid‐State NMR

et al. 2017

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“…Though shaped pulses are often applied in imaging applications (e.g., to boost the signal intensity), rectangular pulses in principle allow for shorter pulse lengths and thus improved pulse excitation profiles. 50 In such cases, the robustness of the refocussing p-pulse with respect to any radiofrequency offsets may be improved by the use of composite p-pulses such as (p/2) j (3p/2) j+p that are rather simple but essential components of so-called symmetry based NMR sequences (Fig. 2).…”

Section: Electrochemical Measurements and Semmentioning

confidence: 99%

⁷Li in situ 1D NMR imaging of a lithium ion battery

Klamor

Zick

Oerther

et al. 2015

Phys. Chem. Chem. Phys.

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The spatial distribution of charge carriers in lithium ion batteries during current flow is of fundamental interest for a detailed understanding of transport properties and the development of strategies for future improvements of the electrolyte-electrode interface behaviour. In this work we explored the potential of (7)Li 1D in situ NMR imaging for the identification of concentration gradients under constant current load in a battery cell. An electrochemical cell based on PTFE body and a stack of glass microfiber discs that are soaked with a technically relevant electrolyte suitable for high-temperature application and squeezed between a Li metal and a nano-Si-graphite composite electrode was assembled to acquire (7)Li 1D in situ NMR profiles with an improved NMR pulse sequence as function of time and state of charge, thereby visualizing the course of ion concentration during charge and discharge. Surface localized changes of Li concentration were attributed to processes such as solid electrolyte interphase formation or full lithiation of the composite electrode. The method allows the extraction of lithium ion transport properties.

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“…some of their characteristics. In previous studies, qualitative rules have been followed to align the main face of the (square) conducting metal electrodes with the RF field direction in order to minimize RF field inhomogeneities, but the RF field dependence on orientation and shape were not known [21,23,24]. In this work, we combine RF field and bulk magnetic susceptibility calculations with experimental NMR and MRI results to clarify the role of the RF-field orientation, skin effects, and susceptibility shifts in determining the appearance of spectra and images of bulk metals and samples that contain them.…”

Section: Introductionmentioning

confidence: 99%

Visualizing skin effects in conductors with MRI: 7Li MRI experiments and calculations

Ilott

Chandrashekar

Klöckner

et al. 2014

Journal of Magnetic Resonance

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While experiments on metals have been performed since the early days of NMR (and DNP), the use of bulk metal is normally avoided. Instead, often powders have been used in combination with low fields, so that skin depth effects could be neglected. Another complicating factor of acquiring NMR spectra or MRI images of bulk metal is the strong signal dependence on the orientation between the sample and the radio frequency (RF) coil, leading to non-intuitive image distortions and inaccurate quantification. Such factors are particularly important for NMR and MRI of batteries and other electrochemical devices. Here, we show results from a systematic study combining RF field calculations with experimental MRI of 7 Li metal to visualize skindepth effects directly and to analyze the RF field orientation effect on MRI of bulk metal. It is shown that a certain degree of selectivity can be achieved for particular faces of the metal, simply based on the orientation of the sample. By combining RF field calculations with bulk magnetic susceptibility calculations accurate NMR spectra can be obtained from first principles. Such analyses will become valuable in many applications involving battery systems, but also metals, in general.

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Solid-state STRAFI NMR probe for material imaging of quadrupolar nuclei

Cited by 15 publications

References 73 publications

Understanding Surface and Interfacial Chemistry in Functional Nanomaterials via Solid‐State NMR

Understanding Surface and Interfacial Chemistry in Functional Nanomaterials via Solid‐State NMR

⁷Li in situ 1D NMR imaging of a lithium ion battery

Visualizing skin effects in conductors with MRI: 7Li MRI experiments and calculations

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Solid-state STRAFI NMR probe for material imaging of quadrupolar nuclei

Cited by 15 publications

References 73 publications

Understanding Surface and Interfacial Chemistry in Functional Nanomaterials via Solid‐State NMR

Understanding Surface and Interfacial Chemistry in Functional Nanomaterials via Solid‐State NMR

7Li in situ 1D NMR imaging of a lithium ion battery

Visualizing skin effects in conductors with MRI: 7Li MRI experiments and calculations

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Product

Resources

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⁷Li in situ 1D NMR imaging of a lithium ion battery