3D Simulation of Cell Design Influences on Sodium–Iodine Battery Performance. Issue 6 (14th January 2021)

• Record Type: Journal Article
• Authors: Gerbig, Felix; Cernak, Susanne; Nirschl, Hermann
• Other Names: Wetzel Thomas guestEditor.; Bessler Wolfgang G. guestEditor.; Kamlah Marc guestEditor.; Nirschl Hermann guestEditor.
• Is Part Of: Energy technology. Volume 9:Issue 6(2021)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2021-01-14
• Subjects: aqueous electrolyte -- battery modeling -- grid energy storage -- molten sodium -- NASICON -- spatially resolved; Energy development -- Periodicals; Power resources -- Periodicals; 333.79
• DOI: 10.1002/ente.202000857
• Languages: English
• ISSNs: 2194-4288

Abstract

Abstract : This publication deals with the spatially resolved simulation of a sodium–iodine secondary battery. The anode compartment consists of molten sodium and the cathode compartment contains a high‐conductivity metal disc as electrode and an aqueous catholyte. The latter comprises iodide, triiodide, dissolved iodine, and sodium ions. A finite volume approach is proposed to model the transport processes and electrochemical reactions focusing on the positive half‐cell. The study investigates the influences of cathode length, C‐rate, electric conductivity, and molar concentrations on cell performance. It considers solubility limits and predicts diffusion limitation as the major constraint for the operating window. The presented investigations are confined to a simple cathode geometry. However, the results demonstrate the capability of the model to design sodium–iodine half‐cells. Abstract : Recently developed sodium–iodine batteries are a promising candidate for small and medium stationary energy storage applications. Herein, a 3D simulation model is presented to investigate a variety of influence quantities on cell performance. Among other findings, it predicts diffusion limitation as the major constraint for achieving sufficient performance with higher C‐rates when using simple cathode electrode structures.