Humidity preservation composite film used for proton exchange film fuel battery and its preparation method

• Main Authors: ZONGQIANG MAO, CHENG WANG, JINGMING XU
• Format: Patent
• Language: English
• Published: 19.10.2005
• Edition: 7
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; FOODS OR FOODSTUFFS; FOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BYSUBCLASSES A23B - A23J; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; HUMAN NECESSITIES; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OFNUTRITIVE QUALITIES, PHYSICAL TREATMENT; THEIR TREATMENT, NOT COVERED BY OTHER CLASSES

A self-moisture-retaining composite film used for fuel cell of proton-exchange film structure is made up by combining a proton-exchange film and a coating layer with moisture-retaining function, and the coating layer is added with inorganic substance or its oxide powder to organic solution of organic substance with the same composition as the organic film and then to coat in on one side or both sides of the organic film. Its preparation method is to use the organic film with proton exchanging ability as matrix, grind the inorganic substance or its oxide into powder of 0.1-10 micron and to mixit uniformly with the organic solvent and the organic substance with the same composition as the organic film to obtain a slurry, and the self-moisture-retaining composite film can be produced by coating the slurry on the surface of the organic film matrix and followed by drying and solidifying.