Composite conductive agent for lithium-sulfur battery positive material and preparation method of composite conductive agent
A technology of composite conductive agent and positive electrode material, which is applied in the direction of battery electrodes, cable/conductor manufacturing, carbon-silicon compound conductors, etc., can solve the problems that electrode materials are difficult to disperse, carbon nanotubes and VCF are small in size, and affect the conductive network. Improve electrical conductivity, increase discharge capacity, and simplify the process
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Embodiment 1
[0024] 10 grams of polyacrylonitrile-based carbon fibers were soaked in acetone for 24 hours to remove the sizing agent on the surface of the carbon fibers. Then cut the carbon fiber into a length of about 5mm, put it into a 250ml agate grinding jar, add 80g of deionized water, and grind for 0.5 hours at 400 rpm. After taking it out, dry it in a blast drying oven at 105° C. to a constant weight to obtain a carbon fiber conductive agent 1 .
[0025] The carbon fiber conductive agent 1 and acetylene black obtained above were ultrasonically dispersed and mixed in a 30% ethanol aqueous solution at a mass ratio of 1:1 for 1 hour, filtered, and dried in a blast drying oven at 105°C to constant weight to obtain carbon fiber / Acetylene black composite conductive agent.
[0026] Mix the obtained composite conductive agent with precipitated sulfur and polyvinylidene fluoride in a mass ratio of 2:7:1, and use N-methylpyrrolidone as a solvent. The mixed slurry is coated on the foamed nic...
Embodiment 2
[0028] Soak 10 grams of polyacrylonitrile carbon fibers in acetone for 24 hours to remove the sizing agent on the surface of the carbon fibers. Then cut the carbon fiber into a length of about 5 mm, put it into a 250 ml agate grinding jar, add 80 grams of deionized water, and grind for 2 hours at 400 rpm. After taking it out, dry it in a blast drying oven at 105° C. to a constant weight to obtain a carbon fiber conductive agent 2 . The carbon fiber conductive agent 2 and acetylene black obtained above were ultrasonically dispersed and mixed in a 30% ethanol aqueous solution at a mass ratio of 1:1 for 1 hour, filtered, and dried in a blast drying oven at 105°C to constant weight to obtain carbon fiber / Acetylene black composite conductive agent. Others are with embodiment 1. see test results figure 2 .
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