Patent ID: 6511771
Filing Date: 2003-01-28
Classification: H01M,Y02E

Abstract:
A negative plate element useful in a lead acid battery wherein the negative plate element comprises negative active material, an organic expander and an acid resistant metal impurity inhibiting amount of macroporous organic polymer particles having internal surfaces and a plurality of chemically different functional groups on said internal surfaces of the macroporous organic polymer particles in which said functional groups have a preferential affinity over lead ion for at least one electrolyte soluble metal impurity ion more nobler than lead at the discharge charge electrochemical and sulfuric acid molarity conditions of the battery provided that the metal impurity ion is not substantially detrimentally desorbed or released from the functional groups under said conditions, soluble lead ion has a substantially reduced affinity for bonding with the functional groups and said macroporous organic polymer particles are associated with said negative active material and in contact with the metal impurity ion containing electrolyte to allow said ion to substantially permeate the internal surfaces of the macroporous organic polymer particles.