Two-dimensional EPR image visualization of a skin effect for a conductive coal cylinder

Tseitlin, Mark; Salikhov, K. M.

doi:10.1007/bf03162317

Cited by 3 publications

(3 citation statements)

References 4 publications

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“…In the case of a multi-component sample with spatially dependent microwave phases or lineshapes, deconvolution using as reference an experimental spectrum with field gradients turned off would not work. Instead, additional projections recorded with varying field gradient strengths would be required 22 , 23 .…”

Section: Resultsmentioning

confidence: 99%

“…Eventually, in a two-dimensional image, also a variation of the surface area exposed to the microwave field, projected onto the imaging plane, causes a signal variation. Therefore, this analysis is not quantitative regarding the number of electron spins in the sample or on the sample surface 22 , 23 .…”

Section: Resultsmentioning

confidence: 99%

“…If the sample thickness d is larger than the skin depth at the frequency used for spin excitation, which is about ≈ 1.1 µm for metallic lithium at X-band microwave frequencies, the experimentally acquired first derivative EPR spectrum shows a Dysonian lineshape that can be approximated by a phase-shifted Lorentzian 14 , 21 . For CEPRI, it has been demonstrated that this effect can influence results and additional measurements with positive and negative gradients are necessary for complete data sets 22 , 23 . In the case of very thin conductive samples, i.e .…”

Section: Introductionmentioning

confidence: 99%

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EPR Imaging of Metallic Lithium and its Application to Dendrite Localisation in Battery Separators

Niemöller

Jakes

Eichel

et al. 2018

Sci Rep

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Conduction Electron Paramagnetic Resonance Imaging (CEPRI) is presented as a sensitive technique for mapping metallic lithium species. The method is demonstrated using different samples that are either thick or thin compared to the microwave skin depth. As a thin sample, microstructured metallic lithium deposits in a lithium-ion battery (LIB) separator were analysed, illustrating the capabilities of CEPRI by obtaining a high-resolution image with an image resolution in the micrometre range. Limitations and intricacies of the method due to non-linear effects caused by the skin effect are discussed based on images of surface patterns on thick metallic lithium samples. The lineshape of the EPR spectrum is introduced as a proxy to determine the suitability of CEPRI for the quantitative visualisation of metallic lithium deposits. The results suggest that CEPRI is particularly suited to analyse the spatial distribution of microstructured Li that forms during charging and discharging of LIB cells, including the localization of the point of failure in the case of an internal cell short circuit caused by dendrites.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

EPR Imaging of Metallic Lithium and its Application to Dendrite Localisation in Battery Separators

Niemöller

Jakes

Eichel

et al. 2018

Sci Rep

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Electron Paramagnetic Resonance and Imaging

Lou,

Liu,

et al. 2024

Energy Storage Materials Characterization

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Quantitative and space-resolved in situ 1D EPR imaging for the detection of metallic lithium deposits

Geng

Liao

et al. 2022

The Journal of Chemical Physics

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The ability to monitor lithium deposition on the anodes in real time is becoming progressively more important due to the development of advanced anode technology. Given the fact that the detrimental Li deposits are always on the micron scale, electron paramagnetic resonance (EPR) happens to be a very effective and selective detection technology due to the skin effect. Here, quantitative in situ 1D EPR imaging is carried out with a magnetic field gradient to achieve a one-dimensional spatial resolution along the Li growth direction in a capillary cell. The quantification of Li deposits is carefully calibrated using a 1,1-diphenyl-2-picrylhydrazyl standard, and a processing method is presented to correct the double integration of the Dysonian line from the metallic Li. The Li deposition processes are compared in two different electrolytes. For the electrolyte containing fluoroethylene carbonate (FEC) additive, the fitting results of Dysonian lines suggest that the plated Li has a larger dimension of the microstructure and the stripping proceeds more uniformly. It thus accounts for the higher Coulombic efficiency in the electrolyte with FEC. In situ EPR imaging also suggests that the Sand’s capacity varies with the electrolytes. The forced growth of dendritic Li is carried out at a very large current density using a derivative operando EPR method to monitor the growth locus of the Li dendrites, indicating a tip-growing mechanism. This work can be instructive for those who are engaged in the study of electro-deposited lithium using in situ EPR imaging technology.

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Two-dimensional EPR image visualization of a skin effect for a conductive coal cylinder

Cited by 3 publications

References 4 publications

EPR Imaging of Metallic Lithium and its Application to Dendrite Localisation in Battery Separators

EPR Imaging of Metallic Lithium and its Application to Dendrite Localisation in Battery Separators

Electron Paramagnetic Resonance and Imaging

Quantitative and space-resolved in situ 1D EPR imaging for the detection of metallic lithium deposits

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