Patent ID: 9379403
Filing Date: 2016-06-28
CPC Classification: C08J,H01M,Y02E

Claim Text:
1. A polymer electrolyte membrane, comprising: (A) an ion exchange resin comprising cation exchange groups which comprise protons; (B) a cerium ion; and (C) at least one second ion selected from the group consisting of a cesium ion and a rubidium ion, wherein a proportion of the cerium ion to the number of the cation exchange groups (100 mol %) is from 0.7 to 30 mol % such that some of the protons in the cation exchange groups are ion-exchanged by the cerium ion, and wherein a total proportion of the at least one second ion to the number of the cation exchange groups (100 mol %) is from 0.2 to 15 mol % such that some of the protons in the cation exchange groups are ion-exchanged by the at least one second ion.