ZINC-CARBON BATTERIES
(Leclanché and Zinc Chloride Cell System)
・ The most widely used of all primary battery system
+ Low cost, readily available, acceptable performance for many applications
+ In-C battery sales = 34.5% of primary battery global market
For cells with ammonium chloride as the primary electrolyte:
Light discharge: Zn + 2MnO, + 2NH,CI 一 2MnOOH + Zn(NH),Cl,
Heavy discharge: 28 + 2MnO, + NH,Cl + H,O 一 2MnOOH + NH, + Zn(OH)CI
Prolonged discharge: Zn + 6MnOOH — 2Mn,O, + ZnO + 3H,0
For cells with zine chloride as the primary electrolyte:
Light or heavy discharge: Zn + 2MnO, + 2H,0 +ZnCl, 一 2MnOOH + 2Zn(OH)CI
or: 4 Zn + 8MnO, + 9H,O + ZnCl, 一 SMnOOH + ZnCl, +4Zn0-SH,O
Prolonged discharge: Zn + 6MnOOH + 2Zn(OH)CI 一 2Mn,O, + ZnCl,-2Zn0-4H,0
・ Specific capacity: calculated = 224 Ah/kg; with electrolyte, C-black and water mass > 96 Ah/kg; actual
specific capacity = 75 Ah/kg (very light loads) — 35 Ah/kg (heavy-duty)
+ Types : general purpose, industrial heavy duty, extra/super heavy duty
・ Construction : cylindrical, flat