| 摘要 |
PURPOSE:To enhance the close contact between long fibers and an active material by heating and kneading an original mixture material which is composed of a conductive resin, a minute powder of a noble metal or an oxide of a noble metal, and a plasticizer, and after that, eluting or extracting the plasticizer so as to give a porosity to the long fibers, being followed by adding the long fibers to a paste. CONSTITUTION:After polyacrylonitrile (30wt%), silver powder (10wt%) and petroleum oil (60wt%) are heated and kneaded with a mixer or the like, the mixture is subjected to extrusion molding so as to obtain long fibers of about 3 denier. Next, a plasticizer contained in the fibers are extracted by ultrasonic waves in a trichloroethylene solution. Thus obtained synthetic fibers are used after being cut into a length of about 1-3mm.. Since thus prepared fibers have irregular surfaces due to the adherence of silver powder, and since an active material enters the fibers due to the porosity of the fibers, the intensity of the active material is considered to be widely increased. As a result, generation of failures caused during assembly of a battery is reduced, the life of the battery is extended by decreasing the separation of the active material, and any defective starting which might be caused by undercharging is prevented. |
