Asymmetric electrical double-layer capacitor using electrochemical activated carbon
AssigneesNational Tsing Hua University, Delta Electronics, Inc.
InventorsChi-Chang Hu, Hsiao-Hsuan Shen
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Abstract
An asymmetric supercapacitor includes a negative electrode made of a first carbon, a positive electrode made of a soft carbon, a separator and an electrolyte. The separator is disposed in between the negative and positive electrodes. The soft carbon has an activation threshold (AT) larger than 1400, and the activation threshold (AT) is obtained from the following formula: AT=La*(Aa/Ac). La is an in-plane correlation length of the soft carbon, Aa is an area of amorphous peak of the soft carbon analysed by X-ray diffraction in Gaussian distribution graph, and Ac is an area of crystalline peak of the soft carbon analysed by X-ray diffraction in Gaussian distribution graph.
Claims6
An asymmetric supercapacitor, comprising:
- a negative electrode made of a first carbon;
- a positive electrode made of a treated soft carbon;
- a separator disposed in between the negative and positive electrodes;
- and
- an electrolyte;
- wherein the treated soft carbon has an activation threshold (AT) larger than 1400, and the activation threshold (AT) is obtained from the following formula:
- AT=La*(Aa/Ac)
- La is an in-plane correlation length of the treated soft carbon, Aa is an area of amorphous peak of the treated soft carbon analysed by X-ray diffraction in Gaussian distribution graph, and Ac is an area of crystalline peak of the treated soft carbon analysed by X-ray diffraction in Gaussian distribution graph.
Dependencies are inferred from the claim text.