Patent ID: 6777131
Filing Date: 2004-08-17
Classification: H01M,Y02E

Abstract:
A negative plate useful in a lead acid battery wherein the negative plate comprises negative active material and an acid resistant metal impurity inhibiting amount of micronized porous organic polymer particles having a 50 percent number count less than about 2 microns and functional groups on the internal surfaces of the micronized porous organic polymer particles which have a preferential affinity over lead ion for at least one electrolyte soluble metal cation impurity ion more nobler than lead at the discharge charge electrochemical and sulfuric acid molarity conditions of the battery provided that the metal cation impurity ion is not detrimentally desorbed or released under said conditions, soluble lead ion has a reduced affinity for bonding with the functional groups and said micronized porous organic polymer particles are accessible to the metal impurity ion containing electrolyte to allow said ion to permeate the internal surfaces of the micronized porous organic polymer particles.