A kind of graphene composite conductive agent and preparation method thereof

Abstract

The invention relates to a graphene composite conductive agent and a preparation method thereof. The graphene composite conductive agent is prepared from the following components in parts by weight: 70-100 parts of graphene, 20-45 parts of carbon nano-tubes, 30-45 parts of epoxy resin, 10-25 parts of monoethanolamine, 200-300 parts of solvent, 2-3 parts of additives, 7-10 parts of conductive polymer agent, 2-4 parts of glass beads and 3-8 parts of iridium acetylacetonate. According to the conductive agent and the method, the graphene is taken as the master component, the carbon nano-tubes are taken as the secondary component, through utilization of the excellent electric conductivity of the graphene, the capacity of an electrode material is increased, the internal resistance of a battery is reduced, and the cycle life of the battery is prolonged. The 2C rate is improved by 6-10% when a lithium ion battery is prepared, the cost is reduced, and the lithium ion battery is highly competitive.

Description

technical field [0001] The invention relates to a lithium ion battery, in particular to a graphene composite conductive agent which reduces cost, improves conductivity and cycle life. Background technique [0002] Lithium-ion batteries have the advantages of high specific energy and no memory effect. In recent years, they have been favored by people as a new energy source and have developed rapidly. With the maturity of technology, people's requirements for lithium-ion batteries are also getting higher and higher. [0003] Lithium-ion batteries in the prior art mainly use conductive graphite, acetylene black and carbon nanotubes as conductive agents. Acetylene black is a chain composed of spherical amorphous carbon particles. It is currently the most widely used conductive agent with low price. , but in order to achieve the purpose of enhancing the mutual contact between electrode active materials, the amount of addition required is large, resulting in a decrease in electrod...

AI Technical Summary

Problems solved by technology

In this technical solution, the structure of graphene can be understood as a single layer of graphite, so it has extremely good electrical conductivity, and the movement speed of electrons reaches 1 / 300 of the speed of light. And the huge specific surface area has more prominent advantages compared to carbon nanotubes or carbon black as conductive agents; and the use of epoxy resin and monoethanolamine is to improve the dispersion uniformity of graphene in the solvent and solve the problem of graphene Difficult problems with partial dispersion;