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Views: 0 Author: Site Editor Publish Time: 2023-03-03 Origin: Site
The charging process of zinc-air batteries is very slow. To solve this problem, the negative zinc plate or zinc particles of zinc-air batteries are oxidized to zinc oxide and fail. The zinc plate or zinc particles and electrolyte are usually replaced directly, making the zinc-air battery completely renewed.
What is a zinc-air battery?
What is the future development trend of zinc-air batteries?
What is the safety of zinc-air batteries?
Zinc-air battery is a new type of chemical power source that uses oxygen in the air as the positive active material and metal zinc as the negative active material. A zinc-air battery is a half battery half fuel cell. First, the negative electrode active material is encapsulated inside the battery like zinc-manganese, lead and other batteries, and has the characteristics of a battery; secondly, the positive electrode active material comes from the oxygen contained in the air outside the battery. The voltage of the zinc-air battery is about 1.4 V, and the discharge current is restricted by the oxygen adsorption and diffusion rate of the activated carbon electrode. Button-shaped zinc-air batteries have a charge capacity of 200–400 mA h and have been widely used in hearing aids.
There are also some institutions studying lithium-air batteries. The working principle of the charge-discharge reaction process is to use lithium as the anode and oxygen in the air as the cathode. During discharge, the lithium in the anode releases electrons to become lithium cations (Li), Li passes through the electrolyte material, and combines with oxygen and electrons from the external circuit at the cathode to form lithium oxide (Li2O) or lithium peroxide Q (Li2O2) , and remain at the cathode, which can be reduced under certain conditions. The open circuit voltage 9 of the lithium-air battery is 2.91V. The lithium-air battery is characterized by a specific energy that is 10 times that of a lithium-ion battery, smaller size and lighter weight. Commercialization is said to take 10 years.
1. The energy density of the battery is high. The theoretical energy density of the zinc-air battery has reached about 1350wh/kg, and the energy density in some applications has reached 200-300wh/kg, which is actually close to the energy density of the ternary lithium battery. the limit theoretical value.
2. Safe and environmentally friendly. Zinc metal is not toxic, nor are other components in the battery flammable. This makes it possible that even if the zinc-air battery is internally short-circuited and the electrolyte leaks, it will not burn or explode, and it is basically pollution-free and harmless to people, equipment or the ecological environment.
3. Stable performance and stable discharge curve. The redox reaction of the positive and negative electrodes is not severe, and the change of voltage during discharge is small, and a long-term discharge platform will appear in the environment of 1.3V voltage.
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