Alkaline battery structure analysis

Date:2021-07-23
Summary:

Alkaline batteries are named after their alkaline elect […]

Alkaline batteries are named after their alkaline electrolyte. Like all dry batteries, the structure of alkaline batteries is mainly composed of positive electrode, negative electrode, and electrolyte. The more common shape of alkaline batteries is cylindrical. The specific structure of this battery and its constituent materials are as follows:
1. Positive electrode: The positive electrode ring is made of electrolytic manganese dioxide, graphite and carbon black in close contact with the outer casing. The outer casing is a nickel-plated steel shell with a positive electrode cap, which doubles as a positive electrode current collector;
2. Negative electrode: a paste made of powdered zinc granules, in the middle of the lithium battery, a brass current collector is inserted in it, and the current collector is connected to the bottom of the negative electrode;
3. Electrolyte: It is a paste KOH electrolyte, which is mixed with the negative electrode to make a paste;
4. Diaphragm and sealing ring: Inside the battery, the positive and negative electrodes are separated by a diaphragm, and the steel shell is separated from the outside by a nylon or polypropylene sealing ring.
The structure of alkaline batteries from the outside to the inside are: sealing ring, steel shell (also serving as a positive current collector), positive electrode, diaphragm, negative electrode, electrolyte, copper tube (also serving as a negative current collector), etc. There is also a button-shaped alkaline battery, often called AG battery, which is a type of button battery.
Alkaline batteries made of various shapes have the same structure. According to this definition: an alkaline battery is a primary battery with zinc as the negative electrode, manganese dioxide as the positive electrode, and potassium hydroxide solution as the electrolyte, referred to as alkaline manganese battery.