Advanced Designs:
Chemistry of Batteries
Aluminum-Air Battery
Sodium-Sulfur Battery
Anode (oxidation):
4[Al(s) + 4 OH-(aq) Al(OH)4-(aq) + 3 e-]
Cathode (reduction):
3[O2 (g) + 2 H2O(l) + 4 e- 4 OH-(aq)
Overall (cell) reaction:
4 Al(s) + 3 O2 (g) + 6 H2O(l) + 4 OH-(aq) 4 Al(OH)4-(aq); Ecell = 2.7 V
Anode (oxidation):
2 Na(l) 2 Na+(l) + 2 e-
Cathode (reduction):
n/8 S8 (l) + 2 e- nS 2-(l)
Overall (cell) reaction:
2 Na(l) + n/8 S8 (l) Na2Sn (l); Ecell = 2.1 V
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