What is the electrochemical reaction of the lead-acid battery discharge process?

The electrochemical reaction of the lead-acid battery discharge process: 1. When the lead-acid battery is discharged, under the use of the potential difference of the battery, the electrons on the negative plate enter the positive plate through the load to form a current I, and chemical reactions are carried out inside the battery together; 2. the negative electrode After each lead atom on the plate releases two electrons, the generated lead ions (Pb+2) react with sulfate ions (SO4-2) in the electrolyte to form insoluble lead sulfate (PbSO4) on the plate; 3. After the lead ions (Pb+4) of the positive plate get two electrons (2e) from the negative electrode, they become divalent lead ions (Pb+2) and react with the sulfate ions (SO4-2) in the electrolyte. The insoluble lead sulfate (PbSO4) is generated on the plate. The oxygen ions (O2) hydrolyzed from the positive plate react with the hydrogen ions (H+) in the electrolyte to produce water as a stable substance; 4. The sulfate ions and hydrogen ions in the electrolyte move to the battery under the use of electric field. The positive and negative electrodes of the battery constitute a current inside the battery, the entire circuit is formed, and the battery continues to discharge; 5. The concentration of H2SO4 continues to decrease during discharge, and the lead sulfate (PbSO2) on the positive and negative electrodes increases, and the internal resistance of the battery increases ( Lead is not conductive), the electrolyte concentration decreases, and the battery electromotive force decreases; 6. The chemical reaction formula is: ① Positive active material, electrolyte, negative active material, positive product, electrolyte product, negative product ↓↓↓↓↓ ↓; ②PbO2+H2SO4+Pb→PbSO4+2H2O+PbSO4 lead oxide, dilute sulfuric acid, lead, lead sulfate, water lead sulfate. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous post: What are the differences between lead-acid batteries and lithium batteries?