Patent ID: 8993682
Filing Date: 2015-03-31
Classification: C08F,C08J,H01B,H01M,Y02E

Abstract:
1. A fluoropolymer electrolyte having an equivalent weight (EW) of not less than 250 but not more than 700 and a proton conductivity of not lower than 0.10 S/cm as measured at a temperature of 110° C. and a relative humidity of 50% RH and which comprises a repeating unit (α) derived from a COOZ group- or SO wherein Y the content of the repeating unit (α) being 10 to 95 mole percent and the content of the repeating unit (β) being 5 to 90 mole percent, with the sum of the repeating unit (α) content and the repeating unit (β) content being 95 to 100 mole percent, and has an ion cluster structure, and is obtained by a chemical treatment of a fluoropolymer electrolyte precursor, wherein said fluoropolymer electrolyte precursor has a melt flow rate of 16 g/10 minutes or below, wherein the distance between the ionic clusters at 25° C. and a relative humidity of 50% RH as calculated from the formula (I) given below following small angle X-ray measurement is not shorter than 0.1 nm but not longer than 2.6 nm: wherein d is said distance between ionic clusters, λ is wavelength of incident X ray used in small angle X-ray scattering measurement and θm is peak-showing Bragg angle.