柔性电的电化学力学理论:在软固体电解质离子电导率研究中的应用

IF 2.6 4区 工程技术 Q2 MECHANICS
Anand Mathew, Yashashree Kulkarni
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引用次数: 0

摘要

柔性电池在包括可穿戴医疗设备和生物医学传感器、柔性显示器和智能手表在内的多个领域获得了发展势头。这些储能装置受到电化学-机械效应的影响。在这里,我们提出了一个结合柔性电和扩散的机电理论的理论框架。作为一个例子,我们研究了柔性电对软质材料中离子电导率的影响。我们对由软质材料制成的薄膜的分析结果表明,离子电导率在纳米尺度上显著较高,并随着薄膜厚度的增加呈指数下降,接近体积值。此外,我们发现,当薄膜厚度小于与挠曲电相关的长度尺度时,挠曲电显著降低了离子电导率。这种行为归因于挠性电诱导的相反极化方向和化学势驱动的离子流动。这些发现揭示了柔性电和扩散之间的相互作用,这对设计小型化储能装置至关重要。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
An electro-chemo-mechanical theory with flexoelectricity: application to ionic conductivity of soft solid electrolytes
Abstract Flexible batteries are gaining momentum in several fields, including wearable medical devices and biomedical sensors, flexible displays, and smartwatches. These energy storage devices are subjected to electro-chemo-mechanical effects. Here, we present a theoretical framework that couples electromechanical theory incorporating flexoelectricity with diffusion. As an example, we investigate the effect of flexoelectricity on the ionic conductivity in soft materials. Our analytical results for a thin film made of a soft material reveal that the ionic conductivity is significantly higher at the nanoscale and decreases exponentially to approach the bulk value with increasing film thickness. Furthermore, we find that flexoelectricity reduces the ionic conductivity dramatically at film thickness smaller than the length scale associated with flexoelectricity. This behavior is attributed to the opposite directions of polarization induced by flexoelectricity and the flow of ions driven by the chemical potential. These findings shed light on the interplay between flexoelectricity and diffusion which would be paramount in designing miniaturized energy storage devices.
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来源期刊
CiteScore
4.80
自引率
3.80%
发文量
95
审稿时长
5.8 months
期刊介绍: All areas of theoretical and applied mechanics including, but not limited to: Aerodynamics; Aeroelasticity; Biomechanics; Boundary layers; Composite materials; Computational mechanics; Constitutive modeling of materials; Dynamics; Elasticity; Experimental mechanics; Flow and fracture; Heat transport in fluid flows; Hydraulics; Impact; Internal flow; Mechanical properties of materials; Mechanics of shocks; Micromechanics; Nanomechanics; Plasticity; Stress analysis; Structures; Thermodynamics of materials and in flowing fluids; Thermo-mechanics; Turbulence; Vibration; Wave propagation
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