A high-power lithium-ion battery

Abstract

The invention relates to a high-power lithium-ion battery, which comprises a positive plate, a negative plate, a membrane and an electrolyte, wherein the lithium-ion battery comprises a graphene composite conductive agent; the high-power lithium-ion battery is evenly dispersed into a positive active material and a negative active material; and the graphene composite conductive agent is prepared from the following components in parts by mass: 120-150 parts of graphene, 20-35 parts of Super-p, 10-15 parts of carbon nanotubes, 30-45 parts of nonylphenol polyoxyethylene ether, 10-25 parts of monoethanolamine, 200-300 parts of solvents, 2-3 parts of assistants, 7-10 parts of conductive polymer agents, 2-4 parts of glass beads and 3-8 parts of acetylacetonate iridium. The graphene is taken as a main component and has excellent conductivity, so that the capacity of the electrode material is improved; the internal resistance of the battery is reduced; the cycle lifetime of the battery is prolonged; the cost is reduced; and the lithium-ion battery has higher competitiveness.

Description

technical field [0001] The invention relates to a lithium-ion battery, in particular to a high-power lithium-ion battery with reduced cost, improved 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 electrode capa...

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;