Tsinghua University

Delta Electronics, Inc.

Hsiao-Hsuan Shen

Chi-Chang Hu

Chien-Liang Liu

Kuo-Hsin Chang

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=L*(A/A). Lis an in-plane correlation length of the soft carbon, Ais an area of amorphous peak of the soft carbon analyzed by X-ray diffraction in Gaussian distribution graph, and Ais an area of crystalline peak of the soft carbon analyzed by X-ray diffraction in Gaussian distribution graph.

Asymmetric electrical double-layer capacitor using electrochemical activated carbon

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=L*(A/A). Lis an in-plane correlation length of the soft carbon, Ais an area of amorphous peak of the soft carbon analysed by X-ray diffraction in Gaussian distribution graph, and Ais an area of crystalline peak of the soft carbon analysed by X-ray diffraction in Gaussian distribution graph.

The present invention relates to a method for manufacturing an electrode of a supercapacitor, comprising: (A) providing a carbon substrate and a phosphorus-containing precursor, and mixing the carbon substrate and the phosphorus-containing precursor at a ratio of 1:100 to 1000:1 by weight; (B) heating the mixture of the carbon substrate and the phosphorus-containing precursor to a temperature between 300&#xb0; C. and 1100&#xb0; C. to obtain a P-doped carbon substrate; and (C) forming an electrode of a supercapacitor by using the P-doped carbon substrate. The present invention also relates to a supercapacitor which comprises: a first electrode; a second electrode; and an electrolyte that is interposed between the first electrode and the second electrode, wherein at least one of the first electrode and the second electrode is prepared by the above-mentioned method.

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Hsinchu, Taiwan

Hsiao-Hsuan Shen