A supercapacitor and a method for preparing the same

By introducing capacitive carbon with Lewis acid and Lewis alkali components into the positive and negative active layers of the supercapacitor, and adjusting the material ratio, the gas production and capacity reduction problems of the supercapacitor during the charging and discharge process are solved, the voltage window is widened, and the energy density and life are improved.

CN118824745BActive Publication Date: 2025-09-05INST OF COAL CHEM CHINESE ACAD OF SCI +1
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Patent Information

Application Number
CN202411122820.8
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-08-15
Publication Date
2025-09-05
Estimated Expiration
2044-08-15

AI Technical Summary

Technical Problem

Existing supercapacitors are prone to gas production, capacity decreases and resistance increases during long-term charging and discharging, and insufficient voltage windows, resulting in performance degradation.

Method used

Capacitive carbon with the positive electrode active layer containing Lewis acid components and capacitive carbon with the negative electrode active layer containing Lewis alkali components are used to adjust the proportion and composition of the active material, the adsorption capacity of anions and cations is enhanced, the voltage window is broadened and the energy density is improved.

Benefits of technology

Supercapacitors with high energy density and high voltage aging life have been achieved, reducing gas production and maintaining good capacitor performance.

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Abstract

The present invention discloses a supercapacitor and a preparation method thereof, belonging to the technical field of supercapacitors. In order to solve the technical problems of gas generation, capacity reduction and resistance increase in existing supercapacitors during long-term charging and discharging, the present invention provides a supercapacitor, including a positive electrode, a negative electrode and a diaphragm arranged between the two, the positive electrode is a positive electrode current collector and a positive electrode active layer bonded to the surface of the positive electrode current collector; the negative electrode is a negative electrode current collector and a negative electrode active layer bonded to the surface of the negative electrode current collector; both the positive electrode and the negative electrode active layer include active materials, conductive agents and adhesives; the active materials are composed of different kinds of active substances. By introducing more Lewis acid components to the surface of the positive electrode active material and more Lewis base components to the negative electrode, the adsorption of anions and cations is enhanced, thereby broadening the operating voltage window of the supercapacitor, increasing its energy density and improving its high-voltage cycle performance.
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