A kind of graphene composite conductive agent and lithium ion battery thereof

Abstract

The invention relates to a graphene composite conductive agent and a lithium ion battery prepared from same. The graphene composite conductive agent comprises the components as follows in parts by mass: 80-120 parts of graphene, 20-45 parts of acetylene black, 30-45 parts of nonylphenol polyoxyethylene ether, 10-25 parts of monoethanolamine, 200-300 parts of solvent, 2-3 parts of auxiliaries, 7-10 parts of conductive macromolecular agent, 2-4 parts of glass beads and 3-8 parts of iridium-acetylacetonate. The graphene composite conductive agent takes graphene as the main component and takes the acetylene black as the auxiliary component; due to the excellent conductivity of graphene, the capacity of the electrode material is improved, the internal resistance of the battery is lowered, and the cycling life of the battery is prolonged; and in addition, the 2C rate of the prepared lithium ion battery is improved by 6-10%, so that the cost is saved, and the prepared lithium ion battery is more competitive.

Description

technical field [0001] The invention relates to a lithium ion battery, in particular to a graphene composite conductive agent with reduced cost, improved electrical conductivity and cycle life and a lithium ion battery thereof. 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 i...

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 nonylphenol polyoxyethylene ether and monoethanolamine are used to improve the dispersion uniformity of graphene in solvents , to solve the problem of difficulty in partially dispersing graphene;