Electro-chemo-mechanically coupled computational modelling of structural batteries

Q1 Materials Science Multifunctional Materials Pub Date : 2020-11-24 DOI:10.1088/2399-7532/abc60d
D. Carlstedt, K. Runesson, F. Larsson, Johanna Xu, L. Asp
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引用次数: 21

Abstract

Structural batteries are multifunctional composites that combine load-bearing capacity with electro-chemical energy storage capability. The laminated architecture is considered in this paper, whereby restriction is made to a so called half-cell in order to focus on the main characteristics and provide a computational tool for future parameter studies. A thermodynamically consistent modelling approach is exploited for the relevant electro-chemo-mechanical system. We consider effects of lithium insertion in the carbon fibres, leading to insertion strains, while assuming transverse isotropy. Further, stress-assisted ionic transport is accounted for in addition to standard diffusion and migration. The relevant space-variational problems that result from time discretisation are established and evaluated in some detail. The proposed model framework is applied to a generic/idealized material representation to demonstrate its functionality and the importance of accounting for the electro-chemo-mechanical coupling effects. As a proof of concept, the numerical studies reveal that it is vital to account for two-way coupling in order to predict the multifunctional (i.e. combined electro-chemo-mechanical) performance of structural batteries.
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结构电池的电化学-机械耦合计算模型
结构电池是一种将承载能力与电化学储能能力相结合的多功能复合材料。本文考虑了叠层结构,其中对所谓的半单元进行了限制,以关注主要特性,并为未来的参数研究提供计算工具。一种热力学一致性建模方法被用于相关的电化学-机械系统。我们考虑了锂在碳纤维中的插入效应,导致插入应变,同时假设横向各向同性。此外,除了标准扩散和迁移外,还考虑了应力辅助的离子传输。建立了由时间离散化引起的相关空间变分问题,并对其进行了详细的评价。将所提出的模型框架应用于通用/理想化的材料表示,以证明其功能性和考虑电化学-机械耦合效应的重要性。作为概念的证明,数值研究表明,为了预测结构电池的多功能(即电化学-机械组合)性能,考虑双向耦合至关重要。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Multifunctional Materials
Multifunctional Materials Materials Science-Materials Science (miscellaneous)
CiteScore
12.80
自引率
0.00%
发文量
9
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