Elastic compliances of the “zigzag” and intergranular cracks

Martynyuk, M.; Kachanov, Mark

doi:10.1016/j.ijengsci.2021.103606

Cited by 6 publications

(5 citation statements)

References 14 publications

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“…By reviewing the literature, it is found that the high correlation on the crack width is a relatively unexpected result, since the crack width is rarely measured or addressed in the battery field, while the crack density is a more common physical quantity to characterize structural damage. 28,29 This also means that battery degradation may not be described simply by traditional structural failure methods, but requires a deeper incorporation of electrochemical mechanisms.…”

Section: Resultsmentioning

confidence: 99%

“…For example, it has been widely acknowledged that the electrode-level debonding is a key factor affecting battery performance, 26 but such a phenomenon of debonding between the active layer and the current collector is commonly invisible and difficult to detect directly. 27,28 Meanwhile, it should be emphasized that similar mud crack problems in classic fracture/ damage mechanics commonly focus on the crack density as well, 29,30 although this quantity has been rarely mentioned in the field of LIBs. In any case, it is evident that there is a problem with non-standard and inconsistent descriptions of electrode-level cracks in LIBs.…”

Section: Introductionmentioning

confidence: 99%

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Revealing the Quantitative Connection between Electrode-level Cracks and Capacity Fading of Silicon Electrodes in Lithium-ion Battery

ZHU,

LU,

RUI

et al. 2023

Electrochemistry

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For the coupling problems of lithium-ion batteries, a key issue at hand is that it is still unclear which mechanical failures can cause degradation and how, which is particularly salient at the electrode level. In this work, the correlation between electrode-level cracks and cycling capacity of silicon electrodes is investigated. Unexpectedly, for cracks in active layers, the capacity decreases with the increase of crack width, while the connection of other crack features to the capacity is weaker or even absent. Meanwhile, the modeling results, however, suggest that the increase in crack width cannot directly cause the capacity fading. To explain these results, the relationship between electrode debonding and active layer crack opening is also described quantitatively. By combining the debonding model and the porous electrode model, the connection between crack widths of active layers and capacity fading is clarified, and accurate predictions are obtained. These results indicate that the easily measurable width of active layer cracks is qualified to evaluate degradation, while the electrode debonding is in fact the direct cause of capacity fading. The findings in this work provide a more precise understanding of the degradation mechanism in lithium-ion battery electrodes.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Revealing the Quantitative Connection between Electrode-level Cracks and Capacity Fading of Silicon Electrodes in Lithium-ion Battery

ZHU,

LU,

RUI

et al. 2023

Electrochemistry

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show abstract

“…As far as larger zigzag cracks, generated by mechanical loading, are concerned, their effect was analyzed in the recent work of Martynyuk and Kachanov 7 ; it is further discussed in the text to follow. Figure 6 shows a photomicrograph of the microstructure of the VF sample after rupture (the broken surface is black [epoxy embedding medium]) where the zigzag cracks are clearly seen.…”

Section: Modelingmentioning

confidence: 99%

“…Approximate models of their compliance contributions were developed by Martynyuk and Kachanov, 7 in the framework of 2D modeling. It was found, in particular, that the compliance contribution of a zigzag crack is larger than the one of a rectilinear “shortcut” crack connecting the endpoints of the zigzag.…”

Section: Modelingmentioning

confidence: 99%

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The stress–strain behavior of refractory microcracked aluminum titanate: The effect of zigzag microcracks and its modeling

Mouiya,

Martynyuk,

Kupsch

et al. 2023

J Am Ceram Soc.

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The stress–strain behavior of ceramics, such as aluminum titanate, has certain features that are unusual for brittle materials—in particular, a substantial nonlinearity under uniaxial tension, and load–unload hysteresis caused by the sharp increase of the incremental stiffness at the beginning of unloading. These features are observed experimentally and are attributed to microcracking. Here we compare different degrees of stress–strain nonlinearity of aluminum titanate materials and quantitatively model them. We use advanced mechanical testing to observe the mechanical response at room and high temperature; electron microscopy, and X‐ray refraction radiography to observe the microstructural changes. Experiments show that two types of microcracks can be distinguished: (i) microcracks induced by cooling from the sintering temperature (due to heterogeneity and anisotropy of thermal expansion), with typical sizes of the order of grain size, and (ii) much larger microcracks generated by the mechanical loading. The two microcrack types produce different effects on the stress–strain curves. Such microcracks and the features of the stress–strain behavior depend on the density of the cooling‐induced microcracks and on the distribution of grain sizes. They are modeled analytically and numerically.

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Experimental-numerical-virtual (ENV) modelling technique for composite structure against low velocity impacts

Yuan

Wang

Zhang

et al. 2023

Engineering Structures

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Elastic compliances of the “zigzag” and intergranular cracks

Cited by 6 publications

References 14 publications

Revealing the Quantitative Connection between Electrode-level Cracks and Capacity Fading of Silicon Electrodes in Lithium-ion Battery

Revealing the Quantitative Connection between Electrode-level Cracks and Capacity Fading of Silicon Electrodes in Lithium-ion Battery

The stress–strain behavior of refractory microcracked aluminum titanate: The effect of zigzag microcracks and its modeling

Experimental-numerical-virtual (ENV) modelling technique for composite structure against low velocity impacts

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