A Coupled Electrochemical-Mechanical Analysis of Textile Battery Using Multi-Scale Modeling

Textile battery is a novel fiber-shaped energy storage device that has the capability of flexibility fabricated by numerous yarn assemblies (i.e., woven fabric). Carbon fiber and polymer electrolyte are used for textile battery, each of which contributes to acting as an electrochemical electrode and transporting Li-ion with superior mechanical properties. It is difficult to predict effective electrochemical and mechanical behaviors of yarn-based whole textile battery due to complexity. Herein, we developed a simplified yarn model of textile battery comparing electrochemical and mechanical similarities between yarn scale and filament scale. First, electrochemical and mechanical homogenization methods were applied to the yarn model and visual modeling of carbon fiber and polymer electrolyte was implemented in the filament model. Comparison between homogenized yarn model and filament model was quantitatively carried out using 3D shape descriptors (compactness and cubeness) and a volume-averaged method, demonstrating high accuracy and efficient computational time of the homogenized yarn model. Next, a damage model under flexible condition (i.e., bending) was incorporated into the homogenized yarn model to consider external load effect on the electrochemical performance of textile battery. The effect of different bending conditions on the voltage profile and capacity of textile battery was investigated. Using the developed homogenized yarn model including damage, the electrochemical and mechanical performances of textile battery can be simulated, and detailed results will be presented at the conference.