A lead acid battery consists of a negative electrode made of spongy or porous lead. The lead is porous to facilitate the formation and dissolution of lead. The positive electrode consists of lead oxide. Both electrodes are immersed in a electrolytic solution of sulfuric acid and water.
Voltage of lead acid battery upon charging. The charging reaction converts the lead sulfate at the negative electrode to lead. At the positive terminal the reaction converts the lead to lead oxide. As a by-product of this reaction, hydrogen is evolved.
In a fully charged lead-acid battery the positive electrode is composed of lead dioxide (PbO 2 ). It should be noted that the electrodes in a battery must be of dissimilar materials or the cell will not be able to develop an electrical potential and thus conduct electrical current.
The lead-acid battery consists negative electrode (anode) of lead, lead dioxide as a positive electrode (cathode) and an electrolyte of aqueous sulfuric acid which transports the charge between the two. At the time of discharge both electrodes consume sulfuric acid from the electrolyte and are converted to lead sulphate.
The active circuit parts of a lead-acid battery cell include several components. The negative electrode is made of lead (Pb), while the positive electrode is made of lead dioxide (PbO2). The electrolyte used is typically a 5M H 2 SO 4 aqueous solution. A porous glass mat filled with electrolytes acts as a separator between the two electrodes.
These batteries are commonly referred to as SLI (starting, lighting, and ignition) batteries, reflecting their primary functions in a vehicle. The active circuit parts of a lead-acid battery cell include several components. The negative electrode is made of lead (Pb), while the positive electrode is made of lead dioxide (PbO2).