Graphene conductive paste loaded with small size barrier agent, its preparation method and application
A technology of conductive paste and graphene, which is applied in the direction of conductive materials dispersed in non-conductive inorganic materials, cable/conductor manufacturing, circuits, etc., can solve the problem of poor dispersion of graphene, limiting graphene's high electrical conductivity, high thermal conductivity, etc. problems, to achieve excellent electrical conductivity, performance improvement, and simple processing
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[0034] Another aspect of the present invention provides a kind of preparation method of the graphene conductive paste of loading small size barrier agent, please refer to figure 2 , in a typical implementation, it includes the following steps:
[0035] a, Graphene, small size barrier agent and solvent (dispersant) are mixed uniformly, obtain the first slurry;
[0036] b. Mixing the first slurry with the auxiliary conductive component and the dispersant under vacuum stirring to obtain the second slurry;
[0037] c. Sand grinding and sieving the second slurry to obtain the final highly conductive graphene slurry.
Embodiment 1
[0040] Take 30g of high-quality graphene powder (the average thickness is 3nm, the average sheet size is 20μm, and the average conductivity of the dry powder film is 10 5 S / m) and 10g carbon black are stirred in ethanol and ultrasonically 1h, after mixing evenly, dry at 80 ℃ to obtain the graphene powder of surface adsorption carbon black (such as image 3 ). The powder was stirred with 10g KS-6, 50g PVDF, and 900g NMP in a vacuum planetary mixer for 3 hours, then ground in a sand mill for 2 hours, and passed through a 200-mesh sieve to obtain an oily high-conductivity paste containing 5 wt% carbon. The morphology of the film formed by coating the highly conductive paste on the surface of aluminum foil is as follows: Figure 4 .
Embodiment 2
[0042] Take 30g of high-quality graphene powder (the average thickness is 3nm, the average sheet size is 20μm, and the average conductivity of the dry powder film is 10 5 S / m) and 10 g of 10,000-mesh graphite were stirred in ethanol and ultrasonicated for 1 h, and then dried at 80° C. to obtain graphene powder with carbon black adsorbed on the surface. The powder was stirred with 10g CNTs, 300g LA132 binder, and 650g water in a vacuum planetary mixer for 3 hours, then ground in a sand mill for 2 hours, and passed through a 200-mesh sieve to obtain an aqueous high-conductivity paste containing 5 wt% carbon.
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