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Reaction principle of nickel hydroxide nickel-based battery

wallpapers Tech 2020-08-11
Nickel-based batteries use nickel hydroxide as positive and harmful materials. There are many kinds of basis. According to the different types of anode materials, nickel-based cells can be divided into nickel-iron, nickel-cadmium, nickel-zinc, nickel-hydrogen, and Ni-H2. Generally, in nickel-based cells, the active material nickel oxyhydroxide is used as the positive electrode. Potassium hydroxide is used as the electrolyte, and the metal Fe/Cd/Zn, MH, or H2 material is used as the negative electrode. The overall electrochemical reaction formula (3) that occurs in a nickel-based battery:
  
Figure 1 shows the chemical composition of nickel-based batteries during discharging and charging. When discharging and charging, Ni(OH)2 and Fe/Cd/Zn(OH)2 are formed. M can have a different composition. Nickel-iron and zinc batteries are not practically used in electric vehicles because of their low power performance, high cost, short cycle life, and high maintenance requirements. The energy efficiency of Ni-Fe and Ni-Zn batteries is about 75%. Nickel-cadmium and metal hydrides are currently used to drive electric vehicles because of their high life cycle (2000 or more) and energy density. However, nickel-cadmium has high memory characteristics and is expensive, more than ten times that of LA batteries. However, all the advantages of all nickel-based cells of this type of batteries, recycling issues, and material toxicity issues need to be considered.

In contrast, NiMH has a low memory effect, a small environmental impact, and a broad operating temperature range. Although heat is generated during operation, and sophisticated algorithms and expensive chargers are required, ecological friendliness and maintenance-free nature ensure that Ni-MH batteries are more suitable for electric vehicles than power batteries. Ni-H2 has a high capacity rate, a long life cycle, and tolerates overcharging or over-discharging without being damaged. However, this type of cell is expensive, has a self-discharge proportional to the H2 pressure, and has a low volume energy density. It is a type of power source specially produced for space exploration.
 
Figure 1. Nickel-based battery chemistry. (A) during discharge, (b) during charging, and (c) nickel-based battery prototype

Trunnano is one of the world's largest producers of nickel hydroxide nanomaterials. If you are interested, you can contact Dr. Leo by email: brad@ihpa.net.

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