STP1056: Measurement of the Components of the Ohmic Resistance in Lithium/lodine (P2VP) Batteries

    Streinz, CC
    Corrosion and Electrochemistry Research LaboratoryThe Johns Hopkins University, Baltimore, MD

    Kelly, RG
    Corrosion and Electrochemistry Research LaboratoryThe Johns Hopkins University, Baltimore, MD

    Moran, PJ
    Corrosion and Electrochemistry Research LaboratoryThe Johns Hopkins University, Baltimore, MD

    Jolson, J
    Catalyst research, Owings Mills, MD

    Waggoner, JR
    Gates Energy Products, Gainesville, FL

    Wicelinski, S
    Catalyst research, Owings Mills, MD

    Pages: 9    Published: Jan 1990


    Abstract

    It is well known that at high discharge rates (approximately 200 μA/cm2) the (Li/I2) (P2VP) battery suffers severely increased polarization. Recently, through the use of electrochemical impedance spectroscopy, it has been demonstrated that for cells with pelletized cathodes this increased polarization is dominated by ohmic effects. It has also been shown that monitoring the ohmic impedance throughout discharge provides an excellent means for understanding battery behavior. This is further illustrated in this paper. In this study cells containing only cathode material are utilized to determine the contribution of the cathode to the total cell ohmic impedance. It is demonstrated that prior to discharge the cathode impedance contributes greater than 60% of the full cell ohmic impedance. During discharge both the magnitude and the changes in the measured ohmic impedance are shown to be dominated by the LiI electrolyte layer. Further, it is concluded that the impedance of the cathode increases with increasing molecular weight of the P2VP polymer used in the cathode. As a result, the relative contributions of the cathode and electrolyte to the total ohmic impedance are a function of P2VP molecular weight.

    Keywords:

    lithium iodine battery, lithium batteries, solid electrolyte batteries, pacemaker batteries, electrochemical impedance spectroscopy, ohmic impedance, rate limiting mechanisms


    Paper ID: STP25290S

    Committee/Subcommittee: G01.11

    DOI: 10.1520/STP25290S


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