Lead storage battery

lead storage battery-construction -working principle-uses

1. Dr. K. RAJENDER REDDY LECTURER IN CHEMISTRY Email: [email protected]

2. LEAD STORAGE BATTERY

3. Contents Introduction Schematic diagram Working Principle Video Presentation Uses

4. Introduction It is a secondary cell, i.e : it operates as voltaic cell as well electrical cell, When operating as a voltaic cell, it supplies electrical energy(discharging) and it operates as electrical cell during charging. In lead storage battery, a number of Pb plates and PbO 2 plates are alternatively connected in parallel.

5. Introduction Anode(-): Pb plates Cathode(+): PbO 2 plates Diluted H 2 SO 4 (20-21%) electrolyte All these plates are separated from each other by a insulator

6. Schematic diagram of Lead storage Battery

7. Working principle-Discharging process following chemical reactions takes place at Anode and Cathode during the discharging process. At cathode Pb + SO 4 2- PbSO 4 + 2e - At anode: PbO 2 + SO 4 2- + 4H - + 2e - PbSO 4 + 2H 2 O

8. Working principle-Discharging process T he overall chemical reaction will be PbO 2 + Pb + 2H 2 SO 4 2PbSO 4 + 2H 2 O

9. Working Principle-charging process chemical reactions takes place at Anode and Cathode during the charging process. These reaction are exactly opposite of charging reactions At cathode PbSO 4 + 2e - Pb + SO 4 2- At anode PbSO 4 + 2H 2 O PbO 2 + SO 4 2- + 4H - + 2e - the overall chemical reaction will be 2PbSO 4 + 2H 2 O PbO 2 + Pb + 2H 2 SO 4

10. Lead Storage battery-Video instruction: click on video source: Physics and mathematics animation

11. Uses The battery commonly used in automobiles in a combination of six lead cells in a series(6 x 2 V = 12 V emf ) It is used to supply current in electrical vehicles, telephone exchanges, trins , mines, hospitals, laboratories..etc

12. THANK YOU