| Battery Applications & Technology The
active materials in a battery are those that participate in
the electrochemical charge/discharge
reaction. These materials include the electrolyte and the
positive and negative
electrodes. As mentioned earlier, the electrolyte in a
lead-acid battery is a dilute solution
of sulfuric acid (H2SO4 ). The
negative electrode of a fully charged battery is composed
of sponge lead (Pb) and the positive electrode is composed
of lead dioxide (PbO2 ).
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