Lithium battery graphene conductive paste and preparation method thereof

Abstract

The invention provides a lithium battery graphene conductive paste. The lithium battery graphene conductive paste is characterized by consisting of 10 to 15 parts of graphite power, 0.5 to 2 parts of active agent, 0.5 to 1 part of dispersing agent, 0.2 to 0.3 parts of colloid material, 0.1 to 0.5 parts of carbon nano tube, 0.01 to 0.1 part of accelerant, 85 to 90 parts of solvent, and moderate viscosity modifier. By refining and activating graphite and further dispersing, grinding and stripping the graphite, and under the action of shear force and friction force of a grinding unit, a micron-grade accelerant is used as a micro force transfer medium, so that the graphite is stripped into the graphene, and meanwhile, the micron-grade accelerant, the graphene and the carbon nano tube are interweaved by the colloid material in the grinding process to form a composite micro colloidal particle; the composite micro colloidal particle has an excellent dispersibility in lithium battery anode and cathode active materials, so that the charge discharge efficiency of the active materials is substantially improved; and besides, the composite micro colloidal particle is compounded with the graphene and used for a lithium battery conductive agent, thus the carrier concentration can be remarkably improved, and the conductivity and discharge capacity of the battery active materials can be improved.

Description

technical field [0001] The invention relates to the field of lithium battery conductive materials, in particular to graphene conductive paste, and further relates to a preparation method of graphene conductive paste. Background technique [0002] At present, the positive electrode active materials used in lithium-ion batteries are mostly transition metal oxides or transition metal phosphates (lithium iron phosphate), which are semiconductors or insulators with poor conductivity, so conductive agents must be added to improve conductivity; The conductivity of the negative electrode graphite material is slightly better, but during repeated charge and discharge, the expansion and contraction of the graphite material reduces the contact between the graphite particles, increases the gap, and even some of them separate from the collector, becoming a dead active material and no longer participating Electrode reaction, so it is also necessary to add a conductive agent to maintain the...

AI Technical Summary

Problems solved by technology

[0010] Aiming at the defects that the conductive agent used in the current power lithium battery is difficult to disperse and the conductivity is poor, the present invention provides a graphene conductive paste that is easy to disperse, which not only has a simple preparation process, but also has stable storage and has the same Good dispersion and compatibility, so as to form a conductive network and improve the charge and discharge efficiency of active materials

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