Alkaline Battery
Definition and meaning of Alkaline Battery in chemistry.
An alkaline battery is a type of electrochemical cell that generates electric current through a chemical reaction between zinc metal and manganese dioxide. It's called "alkaline" because the electrolyte is a potassium hydroxide solution, which is basic rather than acidic.
In more detail
Alkaline batteries operate through oxidation-reduction reactions: zinc is oxidized at the negative terminal (anode) while manganese dioxide is reduced at the positive terminal (cathode), creating a flow of electrons through an external circuit that powers devices. The alkaline electrolyte enables these batteries to deliver stable voltage output, higher energy density, and longer shelf life compared to carbon-zinc batteries. Alkaline batteries are primary cells designed for single use, though they remain the most popular disposable battery type for consumer electronics because of their reliable performance and low cost.
Key facts
| Field | Inorganic Chemistry |
|---|---|
| Anode material | Zinc (Zn) |
| Cathode material | Manganese dioxide (MnO2) |
| Electrolyte | Potassium hydroxide (KOH) solution |
Common examples include AA and AAA alkaline batteries from brands like Energizer and Duracell, which power flashlights, remote controls, digital cameras, and numerous household devices.
Frequently asked questions
Why are alkaline batteries better than carbon-zinc batteries?
Alkaline batteries have higher energy density, longer shelf life, and maintain stable voltage output throughout discharge, making them more suitable for high-drain consumer devices.
Can alkaline batteries be recharged?
Standard alkaline batteries are primary cells designed for single use. Attempting to recharge conventional alkaline batteries can be dangerous and damages the battery.