Patent ID: 8273496
Filing Date: 2012-09-25
Classification: H01M,Y02E

Abstract:
1. A fuel cell comprising: an anode conductive layer, an anode catalyst layer, an electrolyte membrane, a cathode catalyst layer, a cathode conductive layer, and a cathode diffusion layer stacked in this order, wherein said cathode diffusion layer has a fabric structure in which a water-swellable fiber and a non-water-swellable fiber are arranged; wherein the non-water-swellable fiber comprises a natural fiber, a cellulose-based chemical fiber, or a synthetic resin; wherein the water-swellable fiber has a swelling coefficient of 5% or higher and the non-water-swellable fiber has a swelling coefficient of less than 5%; wherein the swelling coefficients of the water-swellable fiber and non-water-swellable fiber are determined by the following formula: wherein the dry condition is a condition of the fiber after 24 hours in an environment of 20° C. and a relative humidity of 65%, and wherein the swelled condition is a condition of the fiber after dipping for 5 minutes in water having a temperature of 20° C.