Carbonized biopolymers

A biopolymer and carbonized seaweed technology, which is applied in the preparation/purification of carbon, hybrid capacitors, hybrid capacitor electrodes, etc., can solve the problems of unstable surface modification and achieve low pore volume, high density, and high volume specific capacitance Effect

Inactive Publication Date: 2009-03-04
SGL CARBON SE +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the surface modification obtained in this way appears to be unstable during charge / discharge cycles

Method used

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  • Carbonized biopolymers
  • Carbonized biopolymers
  • Carbonized biopolymers

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Embodiment Construction

[0037] precursor biopolymer

[0038] Carbonization was performed on several commercially available oxygen-rich biopolymers (alginate and carrageenan, see Table 1 ) extracted from seaweeds. Alginate is produced from brown seaweed. Carrageenan is a generic term for polysaccharides prepared by alkaline extraction (and modification) from red seaweed.

[0039] In addition, several species of seagrass that contain large amounts of these biopolymers were directly carbonized. Lessonia Nigrescens is an alginate-rich seaweed, while Hypnea Musciforme and Meristotheca Senegalensis contain high amounts of carrageenan.

[0040] Another promising precursor biopolymer is chitin. Chitin is an unbranched polymer of N-acetyl-D-glucosamine. Chitin is found in fungi and seaweeds, and is a major component of the exoskeletons of arthropods and lower animals, such as the shells of insects, crabs, and shrimp. It can be considered a derivative of cellulose in which the hydroxyl group of the second...

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Abstract

A carbon material suitable for the preparation of electrodes for electrochemical capacitors is obtained by single-stage carbonization of biopolymers with a large content of heteroatoms. Neither addition of an activating agent during carbonization nor subsequent gas phase activation is necessary. Several biopolymers which are available by extraction from seaweed are suitable precursors. Alternatively, the seaweed containing such biopolymers is carbonized directly.

Description

technical field [0001] The present invention relates to carbonized biopolymers and carbonized seaweed suitable as electrode materials in electrochemical capacitors. Background technique [0002] Electrochemical capacitors are devices that store electrical energy by separating charged species through an electrical double layer at the electrode / electrolyte interface. The electrodes of such capacitors must be conductive and electrochemically inert over a wide voltage range. Furthermore, the capacitive behavior must not degrade significantly even after many charge / discharge cycles. Since the capacitance is proportional to the electrode / electrolyte interface, a high surface area of ​​the electrode material is desirable. Activated carbon is the most widely used electrode material for electrochemical capacitors due to its high surface area and high electronic conductivity. In addition to carbon, activated carbon also contains a small amount of oxygen and hydrogen chemically bond...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/02H01M4/58H01G11/34H01G11/48
CPCH01G11/48Y02E60/13C01B31/08H01G11/34C01B31/02H01G9/058C01B32/05
Inventor M·卡德克F·贝古尹E·雷蒙多-皮纳罗
Owner SGL CARBON SE
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