Ragone plots relating power-density to achievable energy-density have been used for many years as an empirical basis for comparative performance evaluation of various battery systems. However, their theoretical basis, and the relative contributions of ohmic and activation (Tafel) polarization effects to the dependence of energy-density on operating power-density have been little studied. Quantitative modeling calculations for various selected values of ohmic resistance, and Tafel exchange-current densities and polarization slopes, b, provide rationalizations for the shape of Ragone diagrams and their positions in the log-log plane of energy-density versus power-density plots. Separate evaluations of the ohmic and Tafel polarization 'components' of the Ragone relations are of practical value in the evaluation of the battery performance. The Tafel value b is of special importance. Complications which arise in trying to represent electrochemical capacitor behaviour in terms of Ragone-type plots are analysed; they are important for the design and operation of hybrid capacitor/battery systems for electric-vehicle drive trains.


    Access

    Access via TIB

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Quantitative modeling of factors determining Ragone plots for batteries and electrochemical capacitors


    Additional title:

    Quantitative Modellierung der Faktoren zur Bestimmung der Ragone-Schaltungen für Batterien und Kondensatorbatterien


    Contributors:
    Pell, W.G. (author) / Conway, B.E. (author)

    Published in:

    Journal of Power Sources ; 63 , 2 ; 255-266


    Publication date :

    1996


    Size :

    12 Seiten, 14 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English





    Theory of Ragone plots

    Christen, Thomas | Online Contents | 2000


    Optimizing energy storage devices using Ragone plots

    Christen, Thomas | Online Contents | 2002



    The Ragone plots guided sizing of hybrid storage system for taming the wind power

    Zhang, Yiming / Tang, Xisheng / Qi, Zhiping et al. | Tema Archive | 2015