Alkaline batteries

Definition

Alkaline batteries are a type of primary battery dependent on the reaction between zinc and manganese dioxide. They are known for their long shelf life and stable voltage output.

5 Must Know Facts For Your Next Test

1. Alkaline batteries use potassium hydroxide as the electrolyte.
2. The anode in an alkaline battery is typically made of zinc powder.
3. The cathode material in an alkaline battery is usually manganese dioxide ($MnO_2$).
4. Alkaline batteries have a nominal voltage of 1.5 volts per cell.
5. They provide more energy density compared to traditional zinc-carbon batteries.

Review Questions

• What materials are used for the anode and cathode in an alkaline battery?
• What is the role of potassium hydroxide in an alkaline battery?
• How does the energy density of alkaline batteries compare to that of zinc-carbon batteries?

Related terms

Electrolyte: A substance that produces an electrically conducting solution when dissolved in water, facilitating ion movement.

$MnO_2$: $MnO_2$ stands for manganese dioxide, which acts as the cathode material in many types of batteries.

Voltage: The electric potential difference between two points, measured in volts (V).