The nickel-cadmium (NiCd) battery is another common secondary battery that is suited for low-temperature conditions with a long shelf life. However, the nickel-cadmium batteries are more expensive and their capacity in terms of watt-hours per kilogram is less than that of the nickel-zinc rechargeable batteries.
負極cathode (reduction):
Cd+2OH- → Cd(OH)2+2e-
充電:Cd(OH)2+2e- → Cd+2OH
正極anode (oxidation):
2e-+NiO2+2H2O → Ni(OH)2+2OH-
充電:Ni(OH)2+2OH- → 2e-+NiO2+2H2O
全反應式overall:
放電:Cd+NiO2+2H2O → Cd(OH)2+Ni(OH)2
充電:Cd(OH)2+Ni(OH)2 → Cd+NiO2+2H2O