Alkaline battery

Alkaline batteries give power to many things.

They make toys, cameras, and radios work. Inside, a mix of metals and chemicals makes energy. Zinc and manganese dioxide work together to do this. This process makes the battery stay strong for a long time.

They come in many shapes. Some are small like buttons. Others are long tubes. You can find them in many homes. They are very useful tools.

An alkaline battery gives power to many things.

You might use them in toys, cameras, or radios. These batteries get their name from a special liquid inside. This liquid is called an electrolyte. In these batteries, the electrolyte is potassium hydroxide. This substance is alkaline, which means its pH value is above 7.

Inside the battery, two parts work together. The negative part is made of zinc. The positive part is manganese dioxide. When you use the battery, a change happens between these parts. This change lets out the power you need. The zinc and manganese dioxide are used up during this time.

Batteries come in many shapes. Some are long tubes, like AA cells. Others are small and round. We call these small ones button cells.

Sometimes, old batteries can leak. This happens because gas builds up inside. The gas creates pressure. This pressure can break the seals. The leaking liquid can damage your toys or tools. It is best to store batteries in a dry place.

An alkaline battery is a type of primary battery that provides power to many things.

These batteries are very common in our homes today. You might find them inside digital cameras, toys, flashlights, or radios. They get their name from the liquid inside called an electrolyte. This electrolyte is potassium hydroxide, which is an alkaline substance. In science, an alkaline substance has a pH value above 7. This makes them different from older zinc-carbon batteries. Alkaline batteries can hold more energy and last longer on a shelf.

They still provide the same 1.5 volts as older types.

Inside the battery, a chemical reaction creates electricity. The negative electrode is made of zinc powder. The positive electrode is a paste of manganese dioxide and carbon.

A separator sits in the middle to keep these parts from touching. This separator is made of cellulose or a special plastic. When you use the battery, the zinc and manganese dioxide are consumed. The potassium hydroxide electrolyte is not used up during this process. The battery's voltage will slowly drop as it discharges. A cell is considered empty when the voltage hits about 0.9 volts.

People have been working on battery science for a long time. Waldemar Jungner developed batteries with an alkaline electrolyte in 1899. Thomas Edison worked on nickel-iron batteries using potassium hydroxide in 1901. Later, a Canadian engineer named Lewis Urry invented the modern alkaline battery. He worked in Canada before moving to Cleveland, Ohio. Urry, Karl Kordesch, and P. A. Marsal filed a patent for this battery in 1957. Their patent was granted in 1960 by the Union Carbide Corporation. This invention changed how we power our portable devices.

Alkaline batteries are used all over the world in huge numbers. More than 10 billion individual units are produced every year globally. In the United States, they make up 80% of all manufactured batteries. Other countries use them a lot, too. In Switzerland, they account for 68% of battery sales. The United Kingdom sees a 60% share of sales. In Japan, they make up 46% of primary battery sales. In the European Union, they represent 47% of all battery sales.

They come in many sizes like AA, AAA, C, and D.

It is important to handle these batteries with care. Sometimes, old or dead batteries can leak.

This happens because gas builds up inside the battery as it ages. This gas creates pressure that can break the seals. The leaking liquid is potassium hydroxide, which can irritate your skin or eyes. It can also damage metal parts like aluminum. To stay safe, you should store batteries in a dry, cool place. You should also remove batteries from devices if you are not using them. Many places have special rules for recycling them to protect the Earth.

An alkaline battery is a type of primary battery that provides electrical energy through chemical reactions.

These batteries are defined by their electrolyte, which is a substance that allows ions to move. In alkaline batteries, this electrolyte is typically potassium hydroxide (KOH). Because potassium hydroxide has a pH value above 7, the substance is considered alkaline. This distinguishes them from older zinc–carbon batteries, which use acidic electrolytes like ammonium chloride or zinc chloride. Compared to those older models, alkaline batteries offer a higher energy density and a longer shelf life while maintaining a standard voltage.

The mechanism of an alkaline battery relies on a specific chemical reaction between two electrodes. The negative electrode, or anode, is composed of zinc. The positive electrode, or cathode, consists of a compressed paste of manganese dioxide (MnO2) mixed with carbon powder for conductivity.

A separator made of cellulose or a synthetic polymer sits between these electrodes. This separator allows ions to pass through but prevents the materials from touching and causing a short circuit. During discharge, the zinc is oxidized, changing from an oxidation state of 0 to +2. Simultaneously, the manganese is reduced, changing from an oxidation state of +4 to +3. The potassium hydroxide electrolyte is not consumed during this process because the ions produced and consumed in the reactions are equal.

Alkaline batteries are manufactured in several distinct forms to suit different needs. They are commonly found in cylindrical shapes, such as the standard AA, AAA, C, and D sizes. These cylindrical cells are housed in a drawn stainless steel can, which serves as the cathode connection. They are also available in small button or coin cell formats.

Some devices require more power, so multiple cells can be connected in series. For example, connecting three cells together will produce a total voltage of approximately 4.5 V. In a standard cylindrical cell, the negative electrode is at the flat end, while the positive terminal is the raised button.

The history of alkaline technology involves several important inventors and milestones. Waldemar Jungner first developed batteries using an alkaline electrolyte in 1899. In 1901, Thomas Edison developed nickel–iron batteries that also utilized a potassium hydroxide electrolyte. The modern alkaline dry battery used today was invented by Canadian engineer Lewis Urry in the 1950s. Urry worked in Canada before joining Union Carbide's Eveready Battery division in Cleveland, Ohio. On October 9, 1957, Urry, Karl Kordesch, and P. A. Marsal filed a patent for this technology. This patent was granted in 1960 and assigned to the Union Carbide Corporation.

Alkaline batteries are incredibly significant in the global market and daily life. Worldwide, over 10 billion individual units are produced. In the United States, these batteries account for 80% of all manufactured batteries. Their popularity is reflected in sales statistics across different regions. In Switzerland, they represent 68% of sales, while in the UK, they make up 60%. In the European Union, they account for 47% of all battery sales, including secondary types. In Japan, they represent 46% of all primary battery sales. They power a vast range of household items, including digital cameras, toys, flashlights, and portable media players.

Understanding how capacity and voltage work is essential for using these batteries effectively. A fresh alkaline cell typically has a nominal voltage of 1.5 V. However, the actual zero-load voltage can range from 1.58 V to 1.60 V depending on the purity of the manganese dioxide. The capacity of the battery depends heavily on the load placed upon it. For example, an AA battery might have a high effective capacity at a low drain. However, at a high load of 1.0 A, such as that required by digital cameras, the capacity can drop significantly. A cell is generally considered fully discharged when its voltage drops to approximately 0.9 V.

While highly useful, alkaline batteries require careful handling due to potential leakage.

As batteries discharge or age, they can generate hydrogen gas. This gas increases internal pressure, which may rupture the seals or the outer metal canister. When this happens, the caustic potassium hydroxide can leak out. This substance can cause irritation to the skin, eyes, and respiratory system. It can also corrode metals like aluminum. If the leak reaches the air, the potassium hydroxide can react with carbon dioxide to form potassium carbonate. This creates a feathery, crystalline structure that can spread and damage electronic circuit boards. To prevent this, it is best to store batteries in a dry place at room temperature and remove them from devices when not in use.