Three-dimensional high-thermal-conductivity and high-electrical-conductivity composite material, preparation method thereof and application thereof

Abstract

The invention discloses a three-dimensional high-thermal-conductivity and high-electrical-conductivity composite material, a preparation method thereof and an application of the composite material serving as an electrode of a supercapacitor. The preparation method comprises the steps of: 1) using a graphene oxide solution and / or graphene solution as an electrolyte, connecting a porous current collector to a positive electrode of a power supply, and performing electrodeposition to obtain a three-dimensional skeleton; 2) using the three-dimensional skeleton as a working electrode, using a raw material solution used for preparing an active substance as an electrolyte, performing cyclic scanning, and then carrying out annealing processing to obtain a three-dimensional composite material containing the active substance. The three-dimensional composite material prepared by the invention can be directly used as the electrode of the supercapacitor, the integrated electrode preparation methodavoids the usage of a polymer-based adhesive and does not require coating operation, and the preparation scheme is simple and efficient; and the prepared three-dimensional composite material has excellent thermal conductivity and electrical conductivity, has a pseudocapacitor feature, has the advantages of excellent rate performance and good electrochemical performance, and the supercapacitor using the three-dimensional composite material as an electrode has good cycle performance.

Description

technical field [0001] The invention belongs to the preparation technology of novel inorganic non-metallic materials, and relates to a three-dimensional composite material, its preparation method and application, in particular to a three-dimensional high thermal conductivity and electric conduction composite material, its preparation method and its application as a supercapacitor electrode. Background technique [0002] Since the 20th century, supercapacitors, an energy storage device with high power density, long cycle life and green environmental protection, have received more and more attention and research. It has been widely used in consumer electronics, data storage backup systems and industrial energy management. and some emerging fields. From the perspective of energy storage mechanism, supercapacitors can be divided into electric double layer capacitors and pseudocapacitors. Electric double layer capacitors use active materials with high specific surface area to re...

AI Technical Summary

Problems solved by technology

Due to the use of polymer-based binders in this preparation method, the thermal conductivity of the overall electrode is extremely low (generally less than 1W / mK), the resistivity is large, and the electrical conductivity is poor. Heat, which is detrimental to the stability and safety of the device, and is prone to powdering during the charging and discharging process, and falls off from the current collector, which is harmful to the stability and safety of the entire device. extremely unfavorable

When charging and discharging with high current, the electrodes tend to generate a lot of heat, which is extremely detrimental to the stability and safety of the supercapacitor

[0004] The current heat dissipation schemes are all by adding some radiators and other devices outside the device or reducing the area of ​​the electrode, etc., but these methods cannot dissipate the heat in a timely and effective manner, and the preparation process is cumbersome, which increases the preparation cost.

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