Lithium–sulfur (Li–S) batteries offer potential for higher gravimetric energy density in comparison to lithium–ion batteries. Since they behave quite different from lithium–ion batteries, distinctive approaches to state estimation and battery management are required to be developed specifically for them. This article describes an experimental work to model and perform real-time estimation of the progression of use-induced aging in prototype Li–S cells. To do that, state-of-the-art 19-Ah Li–S pouch cells were subject to cycling tests in order to determine progressive changes in parameters of a nonlinear equivalent-circuit-network (ECN) model due to aging. A state-of-health (SoH) estimation algorithm was then designed to work based on identifying ECN parameters using forgetting-factor recursive least squares (FFRLS). Two techniques, nonlinear curve fitting and support vector machine (SVM) classification, were used to generate SoH values according to the identified parameters. The results demonstrate that Li–S cell’s SoH can be estimated with an acceptable level of accuracy of 96.7% using the proposed method under realistic driving conditions. Another important outcome was that the “power fade” in Li–S cells happens at a much slower rate than the “capacity fade” which is a useful feature for applications where consistency of power delivery is important.


    Access

    Download


    Export, share and cite



    Title :

    An Experimental Study on Prototype Lithium–Sulfur Cells for Aging Analysis and State-of-Health Estimation


    Contributors:


    Publication date :

    2021-09-01


    Size :

    3813721 byte




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English




    Performance Assessment of Prototype Lithium- Sulfur Cells from Oxis Energy

    De Forton, Guillaume / Ainsworth, David A. / Plichta, Edward et al. | NTRS | 2018


    Performance Assessment of Prototype Lithium- Sulfur Cells from Oxis Energy

    De Forton, Guillaume / Ainsworth, David A. / Plichta, Edward et al. | NTRS | 2018




    State-of-charge estimation with aging effect and correction for lithium-ion battery

    Cheng, Ming-Wang / Lee, Yuang-Shung / Liu, Min et al. | IET | 2015

    Free access