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release time:2023-07-04
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Generally, stainless steel is used to make a small circular box, which is composed of a positive electrode shell and a negative electrode shell, resembling a button (commonly known as a button battery). One end of the positive shell in the box is filled with positive active material consisting of Silver oxide and graphite, and the other end of the negative cover is filled with negative active material consisting of zinc amalgam. The electrolyte solution is KOH concentrated solution. The electrode reaction formula is as follows:
Negative electrode: Zn+2OH -2e==ZnO+H2O
Positive electrode: Ag2O+H2O+2e==2Ag+2OH -
The total reaction formula of the battery is: Ag2O+Zn===2Ag+ZnO
The voltage of the battery is generally 1.59V, with a longer service life.
Both use nickel oxide or Nickel(II) hydroxide as positive electrode, potassium hydroxide or sodium hydroxide as electrolyte solution, and metal cadmium or metal hydride as negative electrode. Metal hydride battery was invented in the late 1980s by using hydrogen absorbing alloy and electrochemical reversibility of hydrogen releasing reaction. It is the leading product of small secondary battery.
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