Effects of size and concentration on diffusion-induced stress in lithium-ion batteries

Ma, Zengsheng; Gao, Xiang; Wang, Yan; Lu, Chunsheng

doi:10.1063/1.4958302

Cited by 23 publications

(6 citation statements)

References 49 publications

(43 reference statements)

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“…However, the existing knowledge obtained from these investigations is largely focused on SEI chemistry, while very little is known about the mechanical integrity of the SEI. Previous research on mechanical degradation in silicon anodes has largely focused on understanding and mitigating active material damage such as cracking − and delamination . This understanding has led to the design of nanostructured anodes, such as silicon nanowires, silicon nanoparticles, and hollow silicon nanostructures, which are more resistant to fracture .…”

Section: Introductionmentioning

confidence: 99%

Strain-Induced Lithium Losses in the Solid Electrolyte Interphase on Silicon Electrodes

Kumar

Lü

Xiao

et al. 2017

ACS Appl. Mater. Interfaces

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The chemical and mechanical stability of SEI layers are particularly important for high capacity anode materials such as silicon, which undergoes large volume changes (∼300%) during cycling. In this work, we present a novel approach for applying controlled strains to SEI films with patterned Si electrodes to systematically investigate the impact of large volume changes on SEI formation and evolution. Comparisons between patterned silicon islands and continuous silicon thin films make it possible to correlate the irreversible capacity losses due to expansion and contraction of underlying silicon. The current work demonstrates that strain in the SEI layer leads to more lithium consumption. The combination of in situ AFM and electrochemical lithium loss measurements provides further information on SEI layer growth. These experiments indicate that in-plane strains in the SEI layer lead to substantial increases in the amount of inorganic phase formation, without significantly affecting the overall SEI thickness. These observations are further supported with EIS and TOF-SIMS results. A map of irreversible capacity evolution with strain in the SEI is obtained from the experimental results.

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Section: Introductionmentioning

confidence: 99%

Strain-Induced Lithium Losses in the Solid Electrolyte Interphase on Silicon Electrodes

Kumar

Lü

Xiao

et al. 2017

ACS Appl. Mater. Interfaces

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“…In irradiation environments, the mechanical properties of materials are affected by the coupling of dislocation and defect. Based on previous studies [20,59], the slip shear stress t y is associated with dislocations and defect densities. For a single crystal, a rate-independent yield function, F(s, t y ) [14,26,[28][29][30][31][32]36,60] can be written as…”

Section: Yield Functionmentioning

confidence: 99%

A constitutive model coupling irradiation with two-phase lithiation for lithium-ion battery electrodes

Xie

Wang

et al. 2019

Philosophical Magazine

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When lithium-ion batteries serve in extreme environments like space, severe irradiation might induce significant decay of the electrochemical performances and mechanical properties. In this paper, an electrochemical-irradiated constitutive model is proposed to explore the evolution of dislocation, defect and stress in electrodes during a twophase lithiation process. The results from the analytic formulation and finite difference calculations show that, as Li intercalation proceeding, the hoop stress in the surface of a spherical particle converts from compression into tension because the large lithiation strain and plastic yielding at the front pushes out the material behind it. And the plastic flow resistance continuously increases with increasing irradiation dose result from the impediment of a defect to dislocation glide. There is a clear peak in the distribution of stress at yielding locations due to the competition between dislocations multiplication and defects annihilation. The model is meaningful for thoroughly understanding the micro-mechanism of lithiation deformation and provides a guideline for predicting their mechanical behaviours of lithium-ion batteries in unconventional environment.

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“…For further commercialization of the battery materials with high energy density, such as Si and Li metal, the severe mechanical degradation during cycling should be in depth understood [5,6]. Insertion and extraction of Li ions within the active materials could induce cyclic volumetric expansion and contraction, giving rise to stress and damage in electrodes, which lead to capacity fade and declination of lifetime [7][8][9]. Therefore, unveiling the role and impact of the mechanical properties and stress in the degradation and performance of electrodes is indispensable to optimize the performance of LIBs.…”

Section: Introductionmentioning

confidence: 99%

Diffusion-Induced Stress in Commercial Graphite Electrodes during Multiple Cycles Measured by an In Situ Method

Zhu

Liu

et al. 2022

Micromachines

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The cyclic stress evolution induced by repeated volume variation causes mechanical degradation and damage to electrodes, resulting in reduced performance and lifetime of LIBs. To probe the electro-chemo-mechanical coupled degradation, we conducted in situ measurements of Young’s modulus and stress evolution of commercial used graphite electrodes during multiple cycles. A bilayer graphite electrode cantilever is cycled galvanostatically in a custom cell, while the bending deformation of the bilayer electrode is captured by a CCD optical system. Combined with a mechanical model, Li-concentration-dependent elastic modulus and stress are derived from the curvature of the cantilever electrode. The results show that modulus, stress and strain all increase with the lithium concentration, and the stress transforms from compression to tension in the thickness direction. During multiple cycles, the modulus decreases with an increase in the cycle number at the same concentration. The maximum stress/strain of each cycle is maintained at almost same level, exhibiting a threshold that results from the co-interaction of concentration and damage. These findings provide basic information for modeling the degradation of LIBs.

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Effects of size and concentration on diffusion-induced stress in lithium-ion batteries

Cited by 23 publications

References 49 publications

Strain-Induced Lithium Losses in the Solid Electrolyte Interphase on Silicon Electrodes

Strain-Induced Lithium Losses in the Solid Electrolyte Interphase on Silicon Electrodes

A constitutive model coupling irradiation with two-phase lithiation for lithium-ion battery electrodes

Diffusion-Induced Stress in Commercial Graphite Electrodes during Multiple Cycles Measured by an In Situ Method

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