Kinetics and fracture resistance of lithiated silicon nanostructure pairs controlled by their mechanical interaction

Lee, Seok Woo

doi:10.2172/1183698

Cited by 14 publications

(15 citation statements)

References 27 publications

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“…This topic has recently been investigated with a focus on Si nanostructures during lithiation-induced expansion. An experimental study by Lee et al demonstrated that interactions between expanding Si nanostructures altered the volume change behavior and also improved fracture resistance during the first lithiation by reducing the influence of anisotropic expansion [113]. Subsequent modeling has shown that the mechanical stress generated due to impinging Si nanostructures during lithiation-induced expansion can significantly alter the stress state and the spatial Li concentration through chemomechanical effects [114].…”

Section: Interfaces and Mesoscale Phenomenamentioning

confidence: 99%

The mechanics of large-volume-change transformations in high-capacity battery materials

McDowell

Xia

Zhu

2016

Extreme Mechanics Letters

116

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Section: Interfaces and Mesoscale Phenomenamentioning

confidence: 99%

The mechanics of large-volume-change transformations in high-capacity battery materials

McDowell

Xia

Zhu

2016

Extreme Mechanics Letters

116

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“…In our final example, we want to investigate an experimentally observed increase in the fracture resistance of lithiated crystalline silicon nanopillars with radius R under geometric constraints [105], as shown in Fig. 15(a).…”

Section: Diffusion Induced Fracture Of 110 Crystalline Silicon Nanopimentioning

confidence: 99%

A variational framework to model diffusion induced large plastic deformation and phase field fracture during initial two-phase lithiation of silicon electrodes

Zhang

Krischok

Linder

2016

Computer Methods in Applied Mechanics and Engineering

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Silicon (Si) is considered as a promising next-generation anode material for lithium-ion batteries. However, the large volume change during (de)lithiation processes causes fracture of Si electrodes, thereby limiting Si's practical application in lithium-ion batteries. In this work, we formulate a variational-based fully chemo-mechanical coupled computational framework to study diffusion induced large plastic deformation and phase field fracture in Si electrodes. Into this framework we incorporate a recently developed reaction-controlled diffusion model to predict two-phase lithiation for amorphous Si (a-Si) and crystalline Si (c-Si) as well as diffusion induced anisotropic deformation for c-Si. The variational formulation suggests to consider the deformation field, chemical potential, and the damage field as primary unknowns. The concentration field is considered as a local variable and is recovered from the chemical potential on the element level. We carry out several numerical simulations to show the performance of our computational model and point out the significance of accurately accounting for the presence of the reaction front when modeling diffusion induced fracture problems for both a-Si and c-Si electrodes. In addition, we investigate how the fracture energy release rate, diffusion coefficient, electrode geometry, and geometrical constraints affect the fracture behavior of Si electrodes.

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“…Interfacial electro-mechanical behaviour is fundamental to indicators of energy system performance such as electrical power loss, cycle life, and storage capacity in lithium-ion batteries [1,2], sodium-ion batteries [3], solid oxide fuel cells [4], photovoltaics [5] and thermoelectric systems [6]. characteristics [2,10].…”

Section: Introductionmentioning

confidence: 99%

Interfacial electro-mechanical behaviour at rough surfaces

Zhai

Hanaor

Proust

et al. 2016

Extreme Mechanics Letters

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In a range of energy systems, interfacial characteristics at the finest length scales strongly impact overall system performance, including cycle life, electrical power loss, and storage capacity. In this letter, we experimentally investigate the influence of surface topology on interfacial electromechanical properties, including contact stiffness and electrical conductance at rough surfaces under varying compressive stresses. We consider different rough surfaces modified through polishing and/or sand blasting. The measured normal contact stiffness, obtained through nanoindentation employing a partial unloading method, is shown to exhibit power law scaling with normal pressure, with the exponent of this relationship closely correlated to the fractal dimension of the surfaces. The electrical contact resistance at interfaces, measured using a controlled current method, revealed that the measured resistance is affected by testing current, mechanical loading, and surface topology. At a constant applied current, the electrical resistance as a function of applied normal stress is found to follow a power law within a certain range, the exponent of which is closely linked to surface topology. The correlation between stress-dependent electrical contact and normal contact stiffness is discussed based on simple scaling arguments. This study provides a first-order investigation connecting interfacial mechanical and electrical behaviour, applicable to studies of multiple components in energy systems.

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Kinetics and fracture resistance of lithiated silicon nanostructure pairs controlled by their mechanical interaction

Cited by 14 publications

References 27 publications

The mechanics of large-volume-change transformations in high-capacity battery materials

The mechanics of large-volume-change transformations in high-capacity battery materials

A variational framework to model diffusion induced large plastic deformation and phase field fracture during initial two-phase lithiation of silicon electrodes

Interfacial electro-mechanical behaviour at rough surfaces

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