A method for producing an electrode of a capacitor, in particular a super-capacitor

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This invention describes a method for producing a high-capacitance electrode for capacitors, especially supercapacitors, using partially reduced graphite oxide derived from natural or synthetic graphite. The process involves chemically preparing graphite oxide, thermally reducing it in an inert atmosphere, and assembling it into electrodes either as pure powder or bound with PTFE. The resulting material exhibits high specific capacitance (up to 220 F/g), making it especially suitable for use in high-performance energy storage devices.

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• Supercapacitors for electric vehicles, delivering rapid charge/discharge and high power density.
• Energy storage modules for renewable energy systems, such as solar or wind installations.
• Backup power supplies and uninterruptible power systems (UPS).
• High-performance consumer electronics (e.g., smartphones and laptops) needing fast-charging energy storage.
• Industrial applications requiring quick bursts of high power, such as cranes or elevators.

BenefitsContent extracted from patent full text and abstract with AI.

• Enables electrodes with very high specific capacitance (up to 220 F/g), improving energy storage capacity.
• Manufacturing process is relatively simple and reproducible, suitable for both natural and synthetic graphite sources.
• The method allows precise control of electrode characteristics by adjusting the graphite oxide reduction process.
• Resulting electrodes are stable and suitable for high operating voltages, expanding their application range.
• Minimizes contaminants (e.g., amorphous carbon), ensuring better stability and longevity of the supercapacitor.

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Patent Abstract

Partially reduced graphite oxide (GOpr) prepared from natural as well as synthetic graphite was used as electrode material for supercapacitors in 1 M Et4NBF4 in acetonitrile electrolyte. As a function of the degree of reduction of graphite oxide (GO) the graphite layer distance was varied between 0.46 and 0.33 nm. The initial specific capacitance of all samples was negligibly small around the open circuit potential, which was in agreement with the small BET surface area of the reduced GO powder of around 5 m2/g. During the first potential cycle, however, electrochemical activation resulted in a specific capacitance of up to 220 F/g for samples with a graphene layer distance of 0.44 nm. The potential for anodic and cathodic electrochemical activation was found to be a function of the GO layer distance. Dilatometrie investigations showed a significant swelling and shrinking of the samples.