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Enhancing life of storage batteries

EM news bureau ,  Saturday, December 19, 2015, 11:10 Hrs  [IST]

Lead-acid batteries are very old and very popular in our world. It was invented 150 years ago, but the battery system is very unique, since the materials used for the positive and the negative plate are inexpensive and reliable with excellent high capability, Lead acid batteries continues to dominate the power storage market.

The research has already established that over 90% of lead acid batteries die due to chemical reaction of lead & acid. PbSo4, commonly known as “SULFATION”. This sulfation is more often in stationary batteries uses like UPS, Power bank, Storage etc.

Major reason of slow growth in Solar power has been the cost of a system, in-spite of all subsidiaries a stand alone solar application is not as popular as expected or estimated, and one of the reason is cost & life of lead acid batteries. The batteries are approximately 40% cost, of any solar system; these batteries have no fixed life, as sulfation accumulation is never identical in two battery banks. Hence the replacement of batteries is one big headache & recurring expense for the same.

Fig 1.jpgSignet EnerTech Pvt Ltd, Mumbai has worked with their Japanese counter part and developed an organic polymer called “Signet-ETP” which is now very popular amongst bulk battery users to enhance life almost to DOUBLE & also rejuvenate some of the used batteries for more life.

Use of our new soluble organic “ACTIVATOR” in the electrolyte enhances the performance and cycle life and also dissolves the sulfation from the electrode of deteriorated batteries. A few basic reasons for the working mechanism of the organic “ACTIVATOR” (Eco Tec Power) are described below.

Sulfation Removal: Sulfation means formation of crystalline large lead sulfate in the negative electrode. Active lead sulfate is a fine amorphous lead sulfate having large sulface area.?It dissolves easily and produces high discharge current. If the fine active amorphous lead-sulfate is left uncharged long time, it is converted to large crystalline inactive lead sulfate. The large crystalline lead sulfate is inactive for the electrode reaction. In order to remove the sulfation from the deteriorated electrode, the large crystal must be converted to fine active material. Our “Signet-ETP” (activator) is very effective to prevention of sulfation (formation of crystalline lead sulfate) or remove the sulfation from the deteriorated electrode.

Fig 2.pngHydrogen gas evolution is reduced: “Signet-ETP” (Actovator) added to the solution (sulfuric acid electrolyte) is an organic polymer. The dissolved organic poly or Y molecules are adsorbed on the electrode surface and increase the hydrogen evolution voltage (they reduce the hydrogen gas evolution). This Signet-ETP adsorption reduces hydrogen gas (water electrolytes) and help to convert large inactive crystalline lead sulfate to fine active amorphous lead sulfate. [Fig 2]

Fine amorphous metallic lead formation: Fine amorphous high surface area metallic lead is considered very active for the negative electrode of lead acid batteries. When no activator organic molecules are adsorbed (see A1 of Fig.3), lead atom moves easily on the electrode surface (A2) and produces large crystalline lead. When organic polymer molecules (Signet-ETP) are desorbed on the surface (B1), continuous metal crystal is blocked (B2), and new crystal growth sites start as shown in B2. Therefore, in the presence of activator, (adsorbed organic polymer molecules such as Signet-ETP), the produced lead upon the charge process is very fine or finer compared to the one without the activator.

Specific gravity Increase: The first proof is battery shows the change of the specific gravity (s.g.) of the acid solution (electrolyte). When the specific gravity values are measured after normal charge, the value decreases from about 1.280 g/l to 1.20-1.22 g/l as the battery age increases from new to 3-5 years old. The reason is removal of sulfate ion from the electrolyte, since the sulfate ion in the electrolyte deposit as PbSO4 in the electrode. When Signet-ETP, Activator is added and used as usual charge – discharge operation, the specific gravity increases and returns to the original value of 1.28.

This recovery of specific gravity value is good indication for the battery recovery from deterioration. When the battery discharges the sulfuric acid (sulfate ion) concentration decreases. Therefore the specific gravity value decreases. When the battery is charged the specific gravity value increases. We can understand the battery status by measuring the specific gravity value of the acid solution.

As the ITI battery institute Tokyo fond that over 90 per cent of lead acid batteries die due to SULFATION, Signet’s solution of removal of sulfation and preventing formation of the same is really good innovation in enhancing life of batteries & also rejuvenate used battery for more life.

This is a great solution for solar industry to help customers reduce cost and frequent replacement of storage batteries.

Contact: Mr Karan Vyas Director – Operations Signet EnerTech Pvt Ltd 8/63, First Floor, CCI Colony, Unnat Nagar No.4, M.G. Road, Goregaon (West), Mumbai 400 062 T: +91 22 28771618 / 28772015 E: karan@signet.co.in W: www.signet.co.in
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