What are salt batteries

Nowadays, it’s no longer surprising to see a tiny radio receiver or flashlights with various modifications. There are also a wide range of electronic gadgets, such as echo sounders, that have been developed. All of these devices rely on an electrical power supply. To provide power, galvanic cells are used – commonly known as batteries.

The invention of batteries dates back to the early 1800s and is credited to the Italian scientist, Alessandro Volt. Batteries come in various shapes, sizes, voltages, and capacities. They are powered by different elements. The most commonly used types of batteries are alkaline and salt batteries.

Salt battery – what it means

Salt batteries, also known as carbon zinc or carbon batteries, are compact sources of electrical current generated through a chemical reaction. While these devices are inexpensive, their energy capacity is quite limited. As a result, they are primarily utilized in low-power consuming devices. For more energy-demanding devices, salt batteries are not practical as they will deplete quickly.

The arrangement of the salt battery is quite straightforward. It consists of the following components:

1. The body, which is made of zinc, acts directly as a cathode, providing good resistance to corrosion and easy cleaning.
2. For the anode, a pressed agglomerate is utilized and impregnated with electrolyte.
3. The battery employs ammonium chloride or zinc chloride as the electrolyte, with the addition of starch for thickening purposes.
4. In the center, there is a conduit composed of coal and impregnated with a paraffin composition.
5. Located in the upper section is a gas chamber, where the gases generated during the chemical reaction are accumulated.
6. A gasket is present in the upper part to ensure sealing.
7. To prevent corrosion and electrolyte leakage, the battery is equipped with a protective case made of either cardboard or tin plate.

There is a wide range of batteries of this particular type available. Each individual size is assigned its own unique marking. In accordance with the guidelines set forth by the International Electrotechnical Commission, a combination of letters and numbers is employed to identify them. Alternatively, they may sometimes be recognized by the ANSI/NEDA or GOST/TU standards.

Within this diverse assortment, there are two standard sizes of batteries that are readily identifiable based on their appearance. The most commonly used ones are the AA batteries, also commonly referred to as "finger" batteries, and the AAA, or "pinky" batteries. These two sizes share the same voltage and feature a cylindrical shape.

Aside from these, there are an additional three types of batteries to consider. One of them has the appearance of a small barrel and is labeled as either C or LR 14.

Mass production of batteries labeled D or LR 20, resembling a large-sized barrel, was once initiated for flashlights. Interestingly, these batteries also happened to be a perfect fit for portable tape recorders.

In the Soviet Union, batteries labeled R10 were manufactured. They were primarily used for operating measuring instruments and toys.

Cylindrical batteries with a protrusion on one end, where their positive pole is located, have a unique shape. The other side of these batteries remains completely flat.

The rectangular-shaped Element 6 F22, also known as a crown, resembles a matchbox. Despite its small size, this battery exhibits provision of both plus and minus terminals on one side.

Positive and negative properties of salt batteries

In our lives, everything has pros and cons, and the salt battery is no exception. One of its positive attributes is its small size and light weight, making it highly convenient. Additionally, if left idle for periods of time, it can last longer.

There are ways to rejuvenate a "tired" battery, such as vigorously shaking it or tapping it against your hand to dislodge sticky clumps of electrolyte. This can help it continue functioning effectively for a while.

However, there are also negative aspects to salt batteries:

• They have a short shelf life, typically lasting no more than three years.
• They tend to lose their charge on their own.
• The electrolyte often dries up.
• They have a low tolerance for temperature changes;
• Their casing oxidizes and the electrolyte leaks out – that’s why it’s advisable to take them out from the gadget when not in use;
• They possess limited energy capacity.

Where salt batteries are used

Due to their modest energy values, these batteries are primarily designed to supply power to low-consumption devices such as small radios, flashlights, remote controls, and testers. They are manufactured by various factories, including domestic ones like Cosmos, Energia, and Foton, and international ones such as Sanyo and GP.

Not only are these batteries inexpensive, but they are also lightweight. However, they are not suitable for stockpiling as they tend to fail after three years of being idle, even without usage, as they discharge themselves.

Given their low capacity, these batteries are only suitable for devices with low electricity consumption.

According to numerous "folk craftsmen," it is claimed that batteries can be recharged, although this is more on the side of fiction rather than reality. No matter how much you attempt to charge them, there will be no positive outcome. The only possible result would be a potential overheated battery case or a leaked electrolyte. It is advisable to instead opt for alkaline batteries or a standard rechargeable battery.

As a point of reference, it is indeed possible to create a basic salt battery using simple materials that can be found and constructed by hand.

For this project, the following items are required:

• Several 50-kopeck coins
• Foil
• Paper
• Salt solution

Prior to use, the coins should undergo a cleaning process using a vinegar solution. This will eliminate any residue or impurities.

The method of assembly works as follows: take the coin, moisten the paper with the salt solution, and then take the piece of foil. By repeating this process multiple times, we obtain a small column. The coin situated at the very top serves as the positive pole, while the foil positioned at the bottom acts as the negative pole.

Due to the differing potential between the coin and the foil, which is generated by the electrolyte (in this case, the salt solution), an electric current is produced. Essentially, we have replicated Volt’s invention and constructed a Volt pole. The greater the number of coins used, the higher the voltage obtained. Nevertheless, old coins cannot be used for repeat experiments as they will have become rusty.