3D heterogeneous modeling of lithium-ion battery with PLA-graphite/graphite semi-solid flexible electrodes

The flexible lithium-ion batteries (LIBs) are revolutionizing the consumer market mandatory due to their versatility, high energy and power density, and lightweight design. The rising demand of expedient electronic and wearable devices has driven the widespread application of these flexible batteries in view of convenience and efficiency for users. The market demand for next-generation devices has incited the innovative investigation on novel flexible lithium-ion batteries to fulfill evolving needs. In this study, the performance of flexible lithium-ion battery made with PLA-graphite/graphite semi-solid electrodes has been investigated. The semi-solid electrodes were prepared by combining the active and conductive electrode materials with the liquid electrolyte. This setup of viscous and thick slurry enabled an efficient movement for all solid particles within the battery with the application of bending, shear, or pressure forces. In order to investigate the battery’s enactment, the heterogeneous 3D model was developed with the consideration of all electrical and electrochemical parameters of semi-solid electrodes. The COMSOL Multiphysics® software was employed for the finite element analysis (FEA) of the governing equations. The specific discharge capacity of the proposed model has been validated with the experimental results under half- and full-cell modes. Furthermore, the deformation characteristics, battery discharge rate, and operating temperature have been examined using the model of flexible electrodes under half- and full-cell modes. The results of this study suggested the level of optimal functional temperature and rate of discharge for the flexible LIB.