Electric double layer capacitor and method for producing the same
First Claim
1. In an electric double layer capacitor including a pair of polarizable electrodes, the improvement wherein each of said polarizble electrodes includes an activated carbon element comprising a material having activated carbon fibers dispersed therethrough, said electrode having a surface fiber ratio of at least 0.01, wherein said surface fiber ratio is defined as the ratio of the total geometric surface area of said material to the total geometric surface area of said activated carbon fibers.
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Abstract
An electric double layer capacitor having polarizable electrodes including activated carbon fibers which are fully activated and have a large specific surface area, and a method for making the same. Each of the polarizable electrodes is composed of an activated carbon element having a surface fiber ratio (total geometric surface area of fabric/total geometric surface area of secondary fibers or strands) of 0.01 or more. Each activated carbon element is in the form of a woven fabric, nonwoven fabric, felt or the like including activated carbon fibers.
67 Citations
15 Claims
- 1. In an electric double layer capacitor including a pair of polarizable electrodes, the improvement wherein each of said polarizble electrodes includes an activated carbon element comprising a material having activated carbon fibers dispersed therethrough, said electrode having a surface fiber ratio of at least 0.01, wherein said surface fiber ratio is defined as the ratio of the total geometric surface area of said material to the total geometric surface area of said activated carbon fibers.
- 3. A method of making a polarizable electrode for an electric double layer capacitor having a pair of polarizable electrodes, said method including the step of carbonizing and activating a material comprising one of a woven fabric, nonwoven fabric and felt, which are composed of secondary fibers, said material having a surface fiber ratio of at least 0.01, wherein said surface fiber ratio is defined as the ratio of the total geometric surface area of said material to the total geometric surface area of said secondary fibers.
Specification