Active carbon, production method thereof and polarizable electrode
AssigneeShowa Denko K.K.
InventorMasako Tanaka
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Abstract
The present invention relates to an active carbon containing an alkaline earth metal compound inside the particle and having a specific surface area of 10 to 2,000 m2/g, which is suitable to be used for polarizable electrodes in an electric double layer capacitor. The active carbon of the present invention enables to increase the capacitance of an electric double layer capacitor as well as to control the expansion of electrodes. The active carbon of the present invention can be obtained by adding an alkaline earth metal compound to a material such as pitch and performing heat treatment and activation.
Claims23
An active carbon comprising an alkaline earth metal compound in the inside of the particle and having a BET specific surface area of 10 to 2,000 m2/g as determined by a nitrogen adsorption method, and wherein the alkaline earth metal compound is a particle having a particle size of 10 μm or less,
- wherein
- the content of the alkaline earth metal compound is from 30 to 100,000 ppm by mass,
- the ratio of the peak height of D peak (1,360 cm −1) to the peak height of G peak (1,580 cm−1) in the Raman spectrum is from 0.8 to 1.2, and
- the volume of pores having a pore size of 20 to 50 Å is in the range of 0.02 ml/g or more as determined by the BJH method using the nitrogen adsorption method.
Dependencies are inferred from the claim text.