RECHARGEABLE ZINC-CARBON HYBRID-CELLS

A rechargeable zinc-carbon-bromine-complex cell with an immobilised el ectrolyte is described. The cell resembles a cylindrical Leclanche cel l with an outside zinc can and a carbon-rad containing bobbin. A membr ane-type separator prevents shorting on charge. Unlike a Leclanche cel l, which has a very limited rechargeability, this zinc-carbon-bromine- complex system can deliver high currents with excellent recharge abili ty after many complete discharges and is insensitive to cell reversal. Organic complexing agents and additives bind or intercalate the bromi ne which is formed on charge and overcharge. 'Hybrid cells' with MnO2 and graphite-containing cathodes have a useful initial capacity and sh ow a better shelf-life than the simple zinc-carbon-bromine system.