Mechanical insights into the stability of heterogeneous solid electrolyte interphase on an electrode particle

He, Yaolong; Hu, Hongjiu; Zhang, Kefeng; Li, Shuang; Chen, Jinhan

doi:10.1007/s10853-016-0575-3

Cited by 18 publications

(20 citation statements)

References 49 publications

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“…[31,[62][63][64] Several groups developed mechanistic models to describe the mechanical response of the SEI on battery cycling. [14,[64][65][66][67][68][69][70][71][72][73][74][75][76][77][78][79] However, these models focus on SEI mechanics and incorporate at most simple SEI growth models. [14,[65][66][67][68]75,79] In this paper, we develop a detailed electrochemo-mechanical model to describe SEI mechanics and growth on a deforming electrode particle.…”

Section: Introductionmentioning

confidence: 99%

Chemo‐Mechanical Model of SEI Growth on Silicon Electrode Particles**

Kolzenberg

Latz

Horstmann

2021

Batteries & Supercaps

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Silicon anodes promise high energy densities of next-generation lithium-ion batteries, but suffer from shorter cycle life. The accelerated capacity fade stems from the repeated fracture and healing of the solid-electrolyte interphase (SEI) on the silicon surface. This interplay of chemical and mechanical effects in SEI on silicon electrodes causes a complex aging behavior. However, so far, no model mechanistically captures the interrelation between mechanical SEI deterioration and accelerated SEI growth. In this article, we present a thermodynamically consistent continuum model of an electrode particle surrounded by an SEI layer. The silicon particle model consistently couples chemical reactions, physical transport, and elastic deformation. The SEI model comprises elastic and plastic deformation, fracture, and growth. Capacity fade measurements on graphite anodes and in-situ mechanical SEI measurements on lithium thin films provide parametrization for our model. For the first time, we model the influence of cycling rate on the long-term mechanical SEI deterioration and regrowth. Our model predicts the experimentally observed transition in time dependence from square-root-of-time growth during battery storage to linear-in-time growth during continued cycling. Thereby our model unravels the mechanistic dependence of battery aging on operating conditions and supports the efforts to prolong the battery life of next-generation lithium-ion batteries.

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Section: Introductionmentioning

confidence: 99%

Chemo‐Mechanical Model of SEI Growth on Silicon Electrode Particles**

Kolzenberg

Latz

Horstmann

2021

Batteries & Supercaps

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“…Internal stress arises when the active particles inflate or deflate as a consequence of lithium migration. According to the literature [ 49 ], the additional strain occurring in this process can be analogous to the thermal strain and expressed as

where

is the partial molar volume of the host material,

represents the change in lithium concentration relative to the initial state, and

is the identity tensor.…”

Section: Model Formulationmentioning

confidence: 99%

“…Internal stress arises when the active particles inflate or deflate as a consequence of lithium migration. According to the literature [49], the additional strain occurring in this process can be analogous to the thermal strain and expressed as ( )…”

Section: Internal Stressmentioning

confidence: 99%

Mechanical Integrity Degradation and Control of All-Solid-State Lithium Battery with Physical Aging Poly (Vinyl Alcohol)-Based Electrolyte

Zhou

et al. 2020

Polymers

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Ensuring the material durability of an electrolyte is a prerequisite for the long-term service of all-solid-state batteries (ASSBs). Herein, to investigate the mechanical integrity of a solid polymer electrolyte (SPE) in an ASSB upon electrochemical operation, we have implemented a sequence of quasi-static uniaxial tension and stress relaxation tests on a lithium perchlorate-doped poly (vinyl alcohol) electrolyte, and then discussed the viscoelastic behavior as well as the strength of SPE film during the physical aging process. On this basis, a continuum electrochemical-mechanical model is established to evaluate the stress evolution and mechanical detriment of aging electrolytes in an ASSB at a discharge state. It is found that the measured elastic modulus, yield stress, and characteristic relaxation time boost with the prolonged aging time. Meanwhile, the shape factor for the classical time-decay equation and the tensile rupture strength are independent of the aging history. Accordingly, the momentary relaxation modulus can be predicted in terms of the time–aging time superposition principle. Furthermore, the peak tensile stress in SPE film for the full discharged ASSB will significantly increase as the aging proceeds due to the stiffening of the electrolyte composite. It may result in the structure failure of the cell system. However, this negative effect can be suppressed by the suggested method, which is given by a 2D map under different lithiation rates and relative thicknesses of the electrolyte. These findings can advance the knowledge of SPE degradation and provide insights into reliable all-solid-state electrochemical device applications.

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“…6,[14][15][16] For example, He et al proposed that due to the structural and compositional heterogeneity, the stress level is significantly reduced across the SEI layer. 9 Verma et al investigated the effect of the geometries and mechanical properties of the SEI layer on the fracture of the SEI layer. 17 They further suggested that tailoring the mechanical properties of the SEI layer can significantly reduce the fracture inside both the active material and the SEI layer.…”

Section: Introductionmentioning

confidence: 99%

Role of SEI layer growth in fracture probability in lithium‐ion battery electrodes

Ali

Iqbal

Lee

2020

Intl J of Energy Research

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Understanding of degradation mechanisms in batteries is essential for the widespread use of eco-friendly vehicles. Degradation mechanisms affect battery performance not only individually but also in a coupled manner. Solid electrolyte interface (SEI) formation deteriorates battery capacity through consuming available lithium ions. On the other hand, as the SEI layer grows over multiple cycles, the level of mechanical constraints is changed, which can affect the fracture behavior of the active particles. We investigate the effect of the SEI layer growth on the fracture probability of the electrode particles. The simulations show that as the SEI layer grows, tensile stress inside the active particles turns into compressive stress, reducing the probability of particle fracture. Once the SEI layer is fractured, the particle fracture is sequentially more likely to happen because the SEI constraint is removed. The study emphasizes that the stability of SEI layers is important because it helps in alleviating electrochemical performance fade as well as mechanical failure probability. In addition, the SEI layer on small particles tends to be more fractured than that on large particles, suggesting that the particle size uniformity is essential for reducing the fracture probability of the SEI layers at the electrode.

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Mechanical insights into the stability of heterogeneous solid electrolyte interphase on an electrode particle

Cited by 18 publications

References 49 publications

Chemo‐Mechanical Model of SEI Growth on Silicon Electrode Particles**

Chemo‐Mechanical Model of SEI Growth on Silicon Electrode Particles**

Mechanical Integrity Degradation and Control of All-Solid-State Lithium Battery with Physical Aging Poly (Vinyl Alcohol)-Based Electrolyte

Role of SEI layer growth in fracture probability in lithium‐ion battery electrodes

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