subject: Nickel-cadmium battery cathode material for the nickel hydroxide and graphite powder mixture [print this page] Nickel-cadmium battery cathode material for the nickel hydroxide and graphite powder mixture
Ni-Cd battery works
Nickel-cadmium battery cathode material for the nickel hydroxide and graphite powder mixture, anode material for the sponge-like cadmium powder and cadmium oxide powder, the electrolyte is usually sodium hydroxide or potassium hydroxide solution. When the ambient temperature is high, use the density of 1.17 ~ 1.19 (15 pm) of sodium hydroxide solution. When the ambient temperature is low, the use of density of 1.19 ~ 1.21 (15 pm) potassium hydroxide solution. At -15 below, using a density of 1.25 ~ 1.27 (15 pm) potassium hydroxide solution. To take into account low * energy and charge retention ability, sealed nickel-cadmium batteries with a density of 1.40 (15 pm) potassium hydroxide solution. In order to increase battery capacity and cycle life, often in the electrolyte by adding a small amount of lithium hydroxide (about a liter of electrolyte plus 15 ~ 20g) Laptopbattery ACER Laptop Battery .
Nickel-cadmium rechargeable batteries, the cathode material into the board live * NiOOH nickel hydroxide, the negative plate material into a live * Cadmium; nickel-cadmium battery discharge, the cathode material into the board live * H Nickel oxide, anode plate material into the live * of cadmium hydroxide.
1. Discharge of electrochemical reaction
(1) negative reaction
The cadmium negative electrode after the loss of two electrons into divalent cadmium ions Cd2 +, and then immediately with the solution of two hydroxyl ions generated OH-binding cadmium hydroxide Cd (OH) 2, deposition to the anode plate.
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(2) positive response
Positive Living * board material is nickel hydroxide (NiOOH) crystal. Nickel is a positive trivalent ion (Ni3 +), two nickel ions per lattice can be obtained from the external circuit, a negative transfer of two electron, generating the two divalent ions 2Ni2 +. At the same time, the solution ionization out of every two water molecules into two hydrogen ions positive plate, with two lattice oxygen ions combine to produce two hydroxyl ions, and then with two of the original lattice hydroxyl ions together with two divalent nickel ions generated two nickel hydroxide crystals Dell Laptop Battery FUJITSU Laptop Battery.
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Sum of the above two equations, which have nickel-cadmium battery discharge when the overall reaction.
2. Charging the chemical reaction
Charging, the battery's positive and negative, respectively positive and negative charge machine connected to the internal battery discharge completely the opposite occurs and the electrochemical reaction, reduction reaction occurs that is negative, positive oxidation reaction.
(1) negative reaction HP Laptop Battery IBM Laptop Battery SONY Laptop Battery TOSHIBA Laptop Battery
Negative charging plate of cadmium hydroxide, cadmium ions and the first ionized into hydrogen and oxygen ions, then cadmium ion from the external circuit in electronic, generate cadmium atoms attached to the plates, while the hydroxyl ions into the solution involved in positive responses:
