An impedance study of the positive plate of lead acid battery: identification of the electrode polarizations

Journal Article · Mon Oct 01 04:00:00 EDT 1984 · Proc. - Electrochem. Soc.; (United States)

OSTI ID:5460750

Keddam, M; Rakotomavo, C; Takenouti, H

The positive plate of the lead acid battery has been investigated in order to identify the origin of energy loss in a charge-discharge cycle. The various contributions to the dissipative (resistive) part of the electrode impedance are separated on the basis of their individual frequency response. Impedances were measured at frequencies ranging from less than one millihertz to ten kilohertz as a function of the state of charge at various intensities. Disregarding the spurious inductance due to current collectors, three frequency ranges are separated from high to low frequencies. These results are systematically discussed in the framework of the available theories of porous electrodes including an original model accounting for an axial concentration gradient (normal to the electrode surface) in the porous structure. It is concluded that the contributions at high and medium frequencies, i.e. ohmic series resistance of leads and lead oxide paste and distributed impedance in the porous electrode material, are negligible compared to the charge transfer resistance. The latter, corresponding to the diameter of the very low frequency loop, represents except under extremely heavy charge or discharge rates, the major part of the electrode resistance (over 90%).

• Research Organization: LP 0015 CNRS ''Physique des Liquides et Electrochimie'' associe a l'Universite Pierre et Marie Curie PARIS
• OSTI ID: 5460750
• Journal Information: Proc. - Electrochem. Soc.; (United States), Journal Name: Proc. - Electrochem. Soc.; (United States) Vol. 84-14; ISSN PESOD
• Country of Publication: United States
• Language: English

Related Subjects

25 ENERGY STORAGE
250902* -- Energy Storage-- Batteries-- Performance & Testing
250903 -- Energy Storage-- Batteries-- Materials
Components
& Auxiliaries
CHARGE STATE
ELECTRIC BATTERIES
ELECTRIC IMPEDANCE
ELECTROCHEMICAL CELLS
ELECTRODES
IMPEDANCE
LEAD-ACID BATTERIES
PERFORMANCE TESTING
PLATES
POLARIZATION
TESTING