Direct in situ measurements of Li transport in Li-ion battery negative electrodes

Harris, Stephen J.; Timmons, Adam; Baker, Daniel R.; Monroe, Charles W.

doi:10.1016/j.cplett.2009.12.033

Cited by 398 publications

(402 citation statements)

References 63 publications

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“…For anodes made of graphite, 6 overcharging is especially critical because it leads to metallic lithium plating with accompanying degradation and safety issues. [7][8][9][10] Electrode inhomogeneity has been studied experimentally on the centimeter scale by neutron diffraction, 11,12 and on the micrometer scale by Raman Spectroscopy, 13 via which local variations in SOC and degradation have been observed. The availability of tomographic techniques with (sub-)micrometer resolution enables the study of inhomogeneity at the micrometer length scale in three dimensions.…”

mentioning

confidence: 99%

Quantifying Inhomogeneity of Lithium Ion Battery Electrodes and Its Influence on Electrochemical Performance

Müller

Eller

Ebner

et al. 2018

J. Electrochem. Soc.

118

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This paper presents an approach to quantify microstructural inhomegeneity in lithium ion battery electrodes over multiple length scales and examines the impact of this microstructural inhomogeneity on electrochemical performance. Commerical graphite anodes are investigated because graphite remains the anode material of choice due to its low cost, mechanical robustness, and suitable electrochemical properties. At the same time, the graphite anode often plays a role in cell degradation and failure, as lithium plating can occur on the graphite anode during charge, when unfavorable microstructure in the graphite electrode leads to a large overpotential. Here, three-dimensional representations of four different commercial anodes obtained with X-ray tomographic microscopy are statistically analyzed to quantify the microstructural inhomogeneity that is commonly present in lithium ion battery electrodes. Electrochemical simulations on the digitalized microstructures are performed to isolate and understand the influence of different types of microstructural inhomogeneity on battery performance. By understanding how distributions in particle size and shape or slurry and electrode processing cause microstructural inhomogeneity and impact performance, it is possible to determine the extent to which homogeneity should be prioritized for specific applications and how homogeneity could be achieved through smart material selection and processing.

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mentioning

confidence: 99%

Quantifying Inhomogeneity of Lithium Ion Battery Electrodes and Its Influence on Electrochemical Performance

Müller

Eller

Ebner

et al. 2018

J. Electrochem. Soc.

118

View full text Add to dashboard Cite

show abstract

“…Indeed, we demonstrated that the neutron images recorded with LiF are almost free from granular noise, and the spatial resolution reaches ∼5.4 µm; the response is highly linear to the neutron fluence with a dynamic range of at least 10 3 . As drawbacks, we should mention that the sensitivity of LiF to thermal neutrons is not very high and is approximately 2.5 × 10 8 n/cm 2 .…”

Section: Resultsmentioning

confidence: 92%

“…Regardless of the scientific or industrial application, there is a requirement to develop neutron detectors with a spatial resolution improvement of up to 5-10 µm and with a high sensitivity (few percent) to variation in material thickness and structure. For example, in the development of new electrical devices [2][3][4][5] and for neutron source reconstruction from pinhole imaging developed for inertial confined fusion (ICF) experiments using laser irradiation [6][7][8][9] , a spatial resolution on the scale of a few microns is needed.…”

Section: Introductionmentioning

confidence: 99%

Using LiF crystals for high-performance neutron imaging with micron-scale resolution

Faenov

Matsubayashi

Pikuz

et al. 2015

High Pow Laser Sci Eng

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This paper describes an overview of our recent discovery -clear demonstration that LiF crystals can be efficiently used as a high-performance neutron imaging detector based on optically stimulated luminescence of color centers generated by neutron irradiation. It is shown that the neutron images we have obtained are almost free from granular noise, have a spatial resolution of ∼5.4 µm and a linear response with a dynamic range of at least 10 3 . The high contrast and good sensitivity of LiF crystals allow us to distinguish two holes with less than 2% transmittance difference. We propose to use such detectors in areas where high spatial resolution with high image gradation resolution is needed, including diagnostics of different plasma sources such as laser and z-pinch produced plasmas.

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“…This is likely in the case of lithium batteries, where swelling and shrinking of graphite electrode anode associated with (de)lithiation leads to battery degradation and failure through dendrite formation. 42 …”

Section: A C-afm -Ag Cf Growth and Dissolutionmentioning

confidence: 99%

Reversible migration of silver on memorized pathways in Ag-Ge40S60 films

et al. 2015

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Reversible and reproducible formation and dissolution of silver conductive filaments are studied in Ag-photodoped thin-film Ge 40 S 60 subjected to electric fields. A tip-planar geometry is employed, where a conductive-atomic-force microscopy tip is the tip electrode and a silver patch is the planar electrode. We highlight an inherent "memory" effect in the amorphous chalcogenide solid-state electrolyte, in which particular silver-ion migration pathways are preserved "memorized" during writing and erasing cycles. The "memorized" pathways reflect structural changes in the photodoped chalcogenide film. Structural changes due to silver photodoping, and electrically-induced structural changes arising from silver migration, are elucidated using Raman spectroscopy. Conductive filament formation, dissolution, and electron (reduction) efficiency in a lateral device geometry are related to operation of the nano-ionic Programmable Metallization Cell memory and to newly emerging chalcogenide-based lateral geometry MEMS technologies. The methods in this work can also be used for qualitative multi-parameter sampling of metal/amorphous-chalcogenide combinations, characterizing the growth/dissolution rates, retention and endurance of fractal conductive filaments, with the aim of optimizing devices. C 2015 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution 3.0 Unported License.

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Direct in situ measurements of Li transport in Li-ion battery negative electrodes

Cited by 398 publications

References 63 publications

Quantifying Inhomogeneity of Lithium Ion Battery Electrodes and Its Influence on Electrochemical Performance

Quantifying Inhomogeneity of Lithium Ion Battery Electrodes and Its Influence on Electrochemical Performance

Using LiF crystals for high-performance neutron imaging with micron-scale resolution

Reversible migration of silver on memorized pathways in Ag-Ge40S60 films

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