Author : Sooraj Narayan
Release : 2023
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Kind : eBook
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Book Synopsis Electro-chemo-mechanics of Solids by : Sooraj Narayan

Download or read book Electro-chemo-mechanics of Solids written by Sooraj Narayan. This book was released on 2023. Available in PDF, EPUB and Kindle. Book excerpt: In several solid systems, including batteries and various electrochemically-based actuators, charged ions are transported across a solid host material under the influence of electric fields and concentration gradients, which can cause local volumetric expansion and contraction. Since stresses and strains are transmitted very effectively in solids, the chemical expansion leads to significant stress generation in the host material. These stresses also influence the movement of ions, and thus electrochemistry and mechanics are highly coupled in such systems. The overarching theme of this thesis is the theoretical formulation and numerical simulation of such systems. This thesis is divided into two major parts: Part 1. All-solid-state lithium metal batteries: While all-solid-state batteries, which use solid electrolytes (SE), are safer than conventional liquid electrolyte based systems, they are currently plagued by major challenges leading to cell failure, such as lithium filament growth through the SE, fracture of the SE, and decohesion of the anode and the SE. In order to aid and advance our understanding of the mechanisms that lead to these various modes of failure, we have mathematically modeled the electrodeposition and attendant large viscoplastic deformation of lithium at the anode-SE interface of an all-solid-state lithium metal battery (ASSLMB). Through numerical finite-element implementation of our model, we have studied the deleterious effects of plating-and-stripping of lithium around interfacial chemical or mechanical defects in ASSLMBs. Our simulations reveal the role of charging/discharging current levels, cell stack pressure, and other mechanical constraints of the system on possible failure mechanisms of such cells. Part 2. Polyelectrolyte polymers: Ionizable polymeric gels which mechanically respond to electrostatic/chemical stimuli are useful in artificial muscles, artificial skin, and drug delivery applications (among others). We have formulated a thermodynamically-consistent, fully-coupled, theoretical electro-chemo-mechanical framework accounting for large deformations, electrostatic influence on charged species, and simultaneous cross-diffusional transport of multiple mobile species. We have suitably specialized this general framework to model: (i) ionic polymer-metal composites, (ii) ionotronic devices, and (iii) polyelectrolyte gels. Using the finite-element simulation capabilities that we developed for each case, we have successfully validated our models against experiments from the literature. We also show many applications of these materials in technologically-relevant actuators, which demonstrate the utility of our numerical modeling capabilities as a tool for designing ionotronic devices and electro-chemo-mechanical actuators.