Microstructural deformation patterns of a highly orthotropic polypropylene separator of lithium-ion batteries: Mechanism, model, and theory

Pan, Zhexin; Zhu, Juner; Xu, Hongyi; Sedlatschek, Tobias; Zhang, Xiaowei; Li, Wei; Gao, Tao; Xia, Yong; Wierzbicki, Tomasz

doi:10.1016/j.eml.2020.100705

Cited by 20 publications

(8 citation statements)

References 29 publications

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“…[95] Copyright 2018, The Royal Society of Chemistry performances of lithium ion battery, such as capacity and charge/discharge behavior, it is important for separators to avoid the separator deformation that can cause internal short circuit. [105] Meanwhile, mechanical integrity is also of primary importance for the separator to withstand the stress induced by active material upon lithiation and delithiation. [106][107][108] They must be strong enough to endure the high tension forces during construction and work of battery.…”

Section: Mechanical Behavior Issuementioning

confidence: 99%

Composite Separators for Robust High Rate Lithium Ion Batteries

Yuan

Wen

Chen

et al. 2021

Adv Funct Materials

130

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Lithium ion batteries (LIBs) are one of the most potential energy storage devices among various rechargeable batteries due to their high energy/power density, long cycle life, and low self‐discharge properties. However, current LIBs fail to meet the ever‐increasing safety and fast charge/discharge demands. As one of the main components in LIBs, separator is of paramount importance for safety and rate performance of LIBs. Among the various separators, composite separators have been widely investigated for improving their thermal stability, mechanical strength, electrolyte uptake, and ionic conductivity. Herein, the challenges and limitations of commercial separators for LIBs are reviewed, and a systematic overview of the state‐of‐the‐art research progress in composite separators is provided for safe and high rate LIBs. Various combination types of composite separators including blending, layer, core–shell, and grafting types are covered. In addition, models and simulations based on the various types of composite separators are discussed to comprehend the composite mechanism for robust performances. At the end, future directions and perspectives for further advances in composite separators are presented to boost safety and rate capacity of LIBs.

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Section: Mechanical Behavior Issuementioning

confidence: 99%

Composite Separators for Robust High Rate Lithium Ion Batteries

Yuan

Wen

Chen

et al. 2021

Adv Funct Materials

130

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“…[41,42] Due to the particularity of the separator prepared by the dry process, the lamellar structure and pore distribution in the TD could best represent the microstructure information of the entire separator. [43] Therefore, the separator compression along the TD direction was studied, and its microstructure evolution under different displacement loads was explored.…”

Section: Sample Preparationmentioning

confidence: 99%

“…[18,[49][50][51][52] In this article, the lamellar and fibrous structures in the separator are considered the same material. [43,48] The "base material" of separator Celgard 2400 is polypropylene (PP). So the constitutive law used for the separator in finite-element simulation is the constitutive law of PP.…”

Section: Finite-element Modelmentioning

confidence: 99%

Microstructure Evolution of Lithium‐Ion Battery Separator under Compressive Loading: In Situ Experiments and Image‐Based Finite Simulations

Xiao

Chen³

et al. 2022

Energy Tech

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The separator is the weakest mechanical part of a lithium‐ion battery. The displacement load formed by the expansion of an electrode induces the microstructure evolution of the separator, such as decreasing porosity and increasing tortuosity, which affects its ability to transport Li+ and degrades battery performance. Herein, an in situ mechanical loading device combined with focused ion beam–scanning electron microscopy (FIB–SEM) is designed to reveal the real microstructure evolution of a separator under displacement loading. An image‐based finite‐element model is tailored to investigate the microstructure evolution and its nonuniformities of the separator at different deformation levels. The quantitative relationship between the separator porosity and external displacement load is presented based on the experimental and simulation results. Herein, new insight into the degradation mechanisms of commercial lithium‐ion batteries is provided.

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“…In this study, the imaging processing method and finite element simulation are successfully coupled to analyze the stress-strain relation of battery separators. Furthermore, Xu et al [ 55 ] developed a microstructure modelling method to investigate the deformation patterns of the battery separator. Based on their results, the reason why the separator film turns transparent has two folds was explained.…”

Section: Numerical Study Of Separatorsmentioning

confidence: 99%

A Review on Lithium-Ion Battery Separators towards Enhanced Safety Performances and Modelling Approaches

Yuen

Wang

et al. 2021

Molecules

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In recent years, the applications of lithium-ion batteries have emerged promptly owing to its widespread use in portable electronics and electric vehicles. Nevertheless, the safety of the battery systems has always been a global concern for the end-users. The separator is an indispensable part of lithium-ion batteries since it functions as a physical barrier for the electrode as well as an electrolyte reservoir for ionic transport. The properties of separators have direct influences on the performance of lithium-ion batteries, therefore the separators play an important role in the battery safety issue. With the rapid developments of applied materials, there have been extensive efforts to utilize these new materials as battery separators with enhanced electrical, fire, and explosion prevention performances. In this review, we aim to deliver an overview of recent advancements in numerical models on battery separators. Moreover, we summarize the physical properties of separators and benchmark selective key performance indicators. A broad picture of recent simulation studies on separators is given and a brief outlook for the future directions is also proposed.

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Microstructural deformation patterns of a highly orthotropic polypropylene separator of lithium-ion batteries: Mechanism, model, and theory

Cited by 20 publications

References 29 publications

Composite Separators for Robust High Rate Lithium Ion Batteries

Composite Separators for Robust High Rate Lithium Ion Batteries

Microstructure Evolution of Lithium‐Ion Battery Separator under Compressive Loading: In Situ Experiments and Image‐Based Finite Simulations

A Review on Lithium-Ion Battery Separators towards Enhanced Safety Performances and Modelling Approaches

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