Patent ID: 7976976

Claim:
An electrochemical cell which is a sealed lead-acid cell or battery comprising a composite current collector having a density in the range of 0.1 to 10 g/cm 3 wherein the voltage drop along the entire height of said composite current collector at an applied current of 100 Amperes ranges from 1 mV to 1 V, said composite current collector comprising a metallic layer on a polymer substrate characterized by: (i) said metallic layer being (1) an alloy of two or more metals or (2) at least one metal selected from the group of Zn, Cd, Hg, Ga, In, Tl, Sn, Pb, As, Sb, Bi and Se; and (ii) said metallic layer having a thickness in the range of 1 and 5,000 microns.