Materials comprising reduced graphene oxide, devices comprising such materials and methods of making such materials

A graphene and fossil technology, applied in the field of graphene oxide-based materials, can solve problems such as increased electrical breakdown, damage to insulation performance, etc., and achieve the effect of reducing risks
CN105308688BActive Publication Date: 2017-09-08HITACHI ENERGY SWITZERLAND AG
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
HITACHI ENERGY SWITZERLAND AG
Publication Date
2017-09-08

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Abstract

The present invention relates to materials comprising reduced graphene oxide, wherein the degree of reduction of the graphene oxide exhibits a spatial variation such that the material exhibits a gradient in conductivity and / or permittivity. The material may eg be used in electrical devices for field grading and / or charge dissipation purposes. Examples of electrical devices in which the material is beneficial include cable accessories, bushings, power cables, microelectronics, switchgear, and the like. The invention further relates to a method of manufacturing a material for electrical applications. The method involves treating different parts of the graphene oxide element differently to achieve different degrees of reduction of the graphene oxide within the element, resulting in a sample with a gradient in conductivity and / or permittivity. The material can be obtained, for example, by applying a thermal gradient to the graphene oxide element, or by irradiation of the graphene oxide element.
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Description

Technical field

[0001] The present invention relates to the field of graphene oxide-based materials and electrical devices using graphene oxide-based materials. Background technique

[0002] In many applications of electrical technology, materials with different electrical properties are combined. The electric field distribution in and around an electrical device depends on the electrical characteristics of the materials used in the device, as well as the geometry of the device. In AC applications, the field distribution depends to a large extent on the dielectric constant of the device material, while in DC applications, the field distribution largely depends on the electrical conductivity of the device material.

[0003] In many devices, different materials that exhibit very different electrical / dielectric properties are in contact. In such a device, the equipotential lines of the electric field tend to concentrate on the interface towards the low dielectric constant or low con...

Claims

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