Chemistry of Batteries
Secondary (Rechargeable) Batteries (Continued)
Nickel-Cadmium (Nicad) Battery
Anode (oxidation):
Cd(s) + 2 OH-(aq) Cd(OH)2 (s) + 2 e-
Cathode (reduction):
2 NiO(OH)(s) + 2 H2O(l) + 2 e- 2 Ni(OH)2 (s) + 2 OH-(aq)
Overall (cell) reaction:
Cd(s) + 2 NiO(OH)(s) + 2 H2O(l) 2 Ni(OH)2 (s) + Cd(OH)2 (s)
Ecell = 1.4 V
Lithium Solid-State Battery
Anode (oxidation): Li(s) Li+ (in solid electrolyte) + e-
Cathode (reduction): MnO2 (s) + Li+ + e- LiMnO2 (s)
Overall (cell) reaction: Li(s) + MnO2 (s) LiMnO2 (s); Ecell = 3 V
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