Preparation method of graphene conductive agent

Abstract

The invention relates to a conductive agent, in particular to a preparation method of a graphene conductive agent. The method comprises the following steps: (1) preparing a premix solution A; preparing a premix solution B; (3) stirring and mixing the pre-mixed solution A obtained at the step (1) and the pre-mixed solution B obtained in the step (2) according to a mass ratio of 8: 10: 2: 4, addingan auxiliary agent and a conductive polymer agent, carrying out high-pressure dispersion treatment under the pressure of 21000PSI, and then increasing the temperature to 150-200 DEG C, performing stirring for 3-6 hours, performing cooling, and grinding the mixture into particles with the particle size of 10-20 nm, and obtaining the graphene conductive agent. According to the preparation method ofthe graphene conductive agent, the excellent conductivity of graphene is utilized to increase the capacity of an electrode material, the internal resistance of a battery is reduced, and the cycle lifeof the battery is prolonged; the prepared graphene conductive agent is high in electron conduction capability and uniform in heat conduction, and has relatively high liquid absorption and retention capability when being doped into a lithium ion battery.

Description

technical field [0001] The invention relates to a conductive agent, in particular to a preparation method of a graphene conductive agent. Background technique [0002] As a new type of high-energy secondary power supply, lithium-ion secondary batteries have the advantages of large specific energy, stable discharge voltage, high voltage, good low-temperature performance, no pollution, superior safety performance, long storage and working life, and high utilization rate. [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 capacity; carbon nanotubes are linear one-di...

AI Technical Summary

Problems solved by technology

[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 capacity; carbon nanotubes are linear one-dimensional carbonaceous materials, compared with acetylene black, carbon Nanotubes have better electrical conductivity and less addition, but currently carbon nanotubes are expensive and have the disadvantage of being difficult to disperse when used as a conductive agent