Explore the structure and working principle of Zn-MnO₂ dry batteries

Zn-MnO₂ dry battery is a common dry battery, which is mainly composed of zinc shell, electrode, electrolyte, separator and manganese black. This article will introduce you to the structure and working principle of Zn-MnO₂ dry batteries.

First of all, the structure of Zn-MnO₂ dry battery includes positive and negative electrodes, electrolyte and casing. The positive electrode is usually made of manganese oxide compounds such as manganese black or manganese tetroxide, while the negative electrode is usually made of zinc or zinc alloy. The separator between the electrodes is made of organic fibers, and the electrolyte is a mixture of one or more hydrochloric acids. Plastic casings are often used to protect the battery and keep the electrodes separated from the electrolyte when necessary.

Secondly, the working principle of the battery is based on the redox reaction. When the battery is connected to an external circuit, a potential difference is formed between the zinc negative electrode and the manganese oxide positive electrode. Electrons move from the zinc to the manganese oxide and in the process flow through the external circuit to the carrier fluid, thereby forming an electric current. During this process, zinc is oxidized into zinc ions, while manganese oxide is reduced, absorbing electrons and reducing to an ionic state, thereby maintaining the battery state.

In short, Zn-MnO₂ dry battery is a common dry battery. It consists of positive and negative electrodes, electrolyte, separator and shell. Its working principle is based on redox reaction. Understanding the structure and working principle of Zn-MnO₂ dry batteries will help you better apply dry batteries and understand their important role in many devices.