Dry battery
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Last Update: 2020-11-23
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Source: Internet
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Author: User
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battery is also called a hand battery. It is an original battery that makes the electrolyte into a paste, and it can be said that the dry battery makes the original battery practical.
A common dry battery is a cylinder made of zinc as a negative pole, with a carbon rod (i.e. graphite rod) coated with a mixture of manganese dioxide and carbon black inserted in the center as a positive pole. The cylinder contains ammonium chloride, zinc chloride, starch and a mixture of water as electrolytes. Then seal with asphalt and cover. Discharge during use due to redox reaction.
Negative (zinc)
Zn-2e-→Zn2
(oxidation reaction)
(Graphite)
2NH
4
2e-→ The 2NH
3
H
2
(restore reaction)
to prevent hydrogen from gathering on the positive pole, blocking
NH
br br br 4 br/ > reduced, graphite is coated with manganese dioxide. The resulting hydrogen is rapidly oxidized by manganese dioxide to produce water, and the four-price manganese element is reduced to produce
MnO or Mn 2 O 3 .
The voltage of the dry battery is
1.5 to 1.6V. It gradually increases the resistance when used and the voltage decreases rapidly, so it is not suitable for long periods of continuous use. The used dry battery cannot be restored to its starting state, so it is a disposable battery, referred to as a one-time battery.
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