Patent ID: 6770401
Filing Date: 2004-08-03
Classification: H01M,Y02E

Abstract:
A fiber mat separator useful as an electrolyte reservoir in a lead acid battery wherein the fiber mat separator comprises 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 organic macroporous polymer particles.