Devices that convert chemical energy and convert electrical energy into electrical energy and store electrical energy into chemical energy are called accumulators. When electrical energy is taken from an accumulator, some chemical changes occur in the electrolyte and electrodes, and after a while, Emk decreases. When a current is passed through this accumulator in the opposite direction, chemical changes occur in the electrolyte and electrodes and the Emk of the battery increases. Leaded Accumulators: (1) […]
Storage devices that convert chemical energy and convert electrical energy into electrical energy are called accumulators.
When electrical energy is received from an accumulator, electrolyte and There are some chemical changes in the electrodes, and after a while the Emk drops. When a current is passed through this accumulator in the opposite direction, chemical changes occur in the electrolyte and electrodes and the Emk of the battery increases.
Leaded Accumulators: strong>
If the negative plate of a full battery is active Its substance is spongy (porous) lead (Pb), the dark brown color of the positive plate (Pb O2), and its electrolyte is aqueous sulfuric acid with a density of 1.27.
The electrical energy drawn from a battery The amount of n depends on the amount of substance undergoing the chemical change. It is desirable that the amount of active substance in the plaques in contact with the electrolyte be as high as possible. For this, there are many positive and negative plates in a battery. The positive plates were connected by a bridge and the two ends were removed. The positive terminal is called the positive pole of the battery and the negative terminal is called the negative pole of the battery.
The negative structure of a battery and the placement of the plates are seen in the battery section. The negative structure of an accumulator and the placement of the plates can be seen in the battery section. The number of negative plates in an accumulator is one more than the number of positive plates. Placement of the plates is shown together with their separators. The active substance in the plates is filled into grid-shaped cages made of lead-antimony alloy.
(2) Chemical Events in the Discharge of a Leaded Battery:
To discharge the full battery by turning off the switches. lets start. Aqueous sulfuric acid consists of positively charged hydrogen (H2 +) and negatively charged sulphate (So4-) ions. The sulphate ion combines with lead by giving its negative charge to the lead plate and lead sulphate (PbSo4) is formed. The sulfate ion combines with the lead by giving its negative charge to the lead plate and goes to the lead sulphate plate. After giving its charge to this plate, the lead peroxide combines with the oxygen of the plate to form water (H2O). The hydrogen ion of sulfuric acid, which is in contact with the lead peroxide plate, combines with the oxygen of the lead peroxide to form lead sulphate (PbSo4). Thus, both plates turn into lead sulphate. The battery continues to give current to the external circuit until both plates turn into lead sulphate. Because when two plates in electronics are of the same kind, the potential difference between the plates becomes zero.
There are three changes at the time of battery discharge:
1. The acid density in the electrolyte weakens. This reduces Emf.
2. The active substances of the plates, lead peroxide and lead, turn into lead sulphate.
3. The internal resistance of the battery increases, Emk drops.