Electrode material, electrode, and capacitor

A graphene/CNT composite with a C/O ratio of 7 or more and CNT content under 20% addresses conductivity and stacking issues, resulting in a lithium ion capacitor with improved energy and power densities and durability.

CN119213518APending Publication Date: 2024-12-27MATERIALS INNOVATION TSUKUBA INC
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Patent Information

Application Number
CN202380041089.3
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Priority Date
2022-05-19
Filing Date
2023-05-18
Publication Date
2024-12-27

AI Technical Summary

Technical Problem

Graphene oxide materials exhibit low conductivity and easy stacking, affecting electrochemical performance, while lithium ion capacitors require improved durability and capacity.

Method used

A composite of graphene and carbon nanotubes with a C/O ratio of 7 or more and CNT content less than 20% is used, forming a graphene/CNT composite that prevents stacking and maintains high conductivity, enabling a capacitor with high capacity and durability.

Benefits of technology

The graphene/CNT composite achieves a lithium ion capacitor with enhanced energy and power densities, maintaining high capacity and durability even at high temperatures.

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Abstract

Provided are: an electrode material capable of achieving a lithium ion capacitor having high capacity and excellent durability; an electrode using the electrode material; and a capacitor. An electrode is formed using an electrode material containing a composite (10) of graphene and carbon nanotubes, and the electrode is used, for example, for a positive electrode to constitute a lithium ion capacitor. The ratio of carbon atoms to oxygen atoms (C / O) measured by X-ray photoelectron spectroscopy is 7 or more, and the content of carbon nanotubes is less than 20% by mass (excluding 0% by mass).
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