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Carbon black and graphene powder composite conductive agent and preparation method and applications thereof

A technology of composite conductive agent and graphene powder, which is applied in the field of electrochemical materials, can solve the problems of side reactions, difficult removal of reducing agent, large amount of conductive agent, etc.

Active Publication Date: 2017-12-26
THE SIXTH ELEMENT CHANGZHOU MATERIALS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the amount of carbon black added as a conductive agent is relatively large, which reduces the energy density of the material. The carbon nanotube slurry and the graphene slurry are added with a dispersant, and the dispersant will have side reactions under high voltage; more importantly, the dispersant in the slurry Contains a lot of solvents, is easy to settle, and requires a lot of cost in transportation
[0003] CN103832997A and CN103833011A disclose a kind of " graphene / carbon black composite material and preparation method and application ", is to disperse graphite oxide in water and carry out ultrasonic to obtain graphite oxide solution first, then add carbon black and carry out ultrasonic, then filter and dry, will obtain The composite material in CO 2 Carry out high-temperature calcination in an atmosphere of inert gas, and finally obtain graphene / carbon black powder. Graphite oxide can only be obtained by oxidation of graphite. This process is complicated, high cost, low efficiency, difficult to industrialize, and not practical. industrial production value
[0004] CN104240966A discloses a "Partially Reduced Graphene Oxide Composite Material and Its Preparation Method", which is to ultrasonically disperse graphite oxide in water, then ultrasonically disperse carbon black in water with a surfactant, and then filter after mixing by hydrothermal method , followed by high-temperature calcination to obtain the final composite material. In this preparation process, surfactants are added, and the composite is carried out by hydrothermal method, which will have great disadvantages in the subsequent application and scale-up of the product.
[0005] CN106430164A discloses "A Preparation Method of Graphene / Carbon Black Composite Material", which is to ultrasonically mix graphene oxide solution and carbon black solution, and then add a reducing agent for reduction to obtain a composite material. The reducing agent added in this patent is followed It is difficult to remove in the application and will affect its application

Method used

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  • Carbon black and graphene powder composite conductive agent and preparation method and applications thereof
  • Carbon black and graphene powder composite conductive agent and preparation method and applications thereof
  • Carbon black and graphene powder composite conductive agent and preparation method and applications thereof

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Effect test

Embodiment 1

[0059] In the ice-water bath, graphite and concentrated sulfuric acid were added to the reaction vessel at a mass ratio of 1:30 under the stirring condition of 150 rpm, and stirred for 20 minutes, and then graphite: potassium permanganate = 1 : Potassium permanganate with a mass ratio of 2 was slowly added to the reaction solution, the temperature of the system was controlled at 15° C., and the entire addition process took about 30 minutes. After adding potassium permanganate, keep the whole reaction system at 30°C for 2 hours, then add graphite: carbon black powder = 5:1 mass ratio of carbon black powder directly into the reaction system, and make the whole reaction system Continue to incubate at 30°C for 2h. Slowly add graphite: water = 1 g: 40 mL of water into the reaction system after the heat preservation is completed, control the temperature in the reaction system to 80° C., and the stirring speed to 200 rpm. After adding water and keeping warm for 60 minutes, add graph...

Embodiment 2

[0061]In an ice-water bath, add graphite:concentrated sulfuric acid=1:30 mass ratio into the reaction vessel under stirring condition of 150rpm, stir and react for 20min, then add graphite:potassium permanganate=1 under stirring condition of 200rpm in ice-water bath : Potassium permanganate with a mass ratio of 2 was slowly added to the reaction solution, the temperature of the system was controlled at 15° C., and the entire addition process took about 30 minutes. After adding potassium permanganate, keep the whole reaction system at 30°C for 2 hours, then add graphite: carbon black powder = 2.5:1 mass ratio of carbon black powder directly into the reaction system, and make the whole reaction system Continue to incubate at 30°C for 2h. Slowly add graphite: water = 1 g: 40 mL of water into the reaction system after the heat preservation is completed, control the temperature in the reaction system to 80° C., and the stirring speed to 200 rpm. After adding water and keeping warm...

Embodiment 3

[0063] In the ice-water bath, under the stirring condition of 150rpm, add graphite and concentrated sulfuric acid into the reaction vessel according to the mass ratio of 1:30, stir and react for 20min, then in the ice-water bath, under the stirring condition of 200rpm, graphite: potassium permanganate = Potassium permanganate with a mass ratio of 1:2 was slowly added to the reaction solution, the temperature of the system was controlled at 15°C, and the entire addition process took about 30 minutes. After adding potassium permanganate, keep the whole reaction system at 30°C for 2 hours, then add graphite: carbon black powder = 20:1 mass ratio of carbon black powder directly into the reaction system, and make the whole reaction system Continue to incubate at 30°C for 2h. Slowly add graphite: water = 1 g: 40 mL of water into the reaction system after the heat preservation is completed, control the temperature in the reaction system to 80° C., and the stirring speed to 200 rpm. ...

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Abstract

The invention discloses a preparation method of a carbon black and graphene powder composite conductive agent. The preparation method comprises the following steps: forming a graphite oxide / carbon black composite system: adding carbon black powder during the oxidation process of graphite to obtain the graphite oxide / carbon black composite system; and reducing the graphite oxide / carbon black composite system to obtain the graphene / carbon black powder conductive agent. The carbon black is added during the graphite oxide preparation process. The mixture is subjected to low temperature thermal expansion and high temperature reduction in sequence to prepare the conductive agent in one step. No surfactant or reducing agent is added. No difficult technology such as hydrothermal technology is used. The preparation method is close to a graphene preparation technology. The technology is simple, and the operation is easy.

Description

technical field [0001] The invention relates to a conductive agent, in particular to a composite conductive agent of graphene and carbon black and a preparation method thereof, belonging to the field of electrochemical materials. Background technique [0002] Lithium-ion battery is a common energy storage device, and its energy storage principle is that lithium ions are intercalated / extracted in the positive and negative electrode materials, accompanied by the electron transmission of the external circuit. Lithium battery cathode materials mainly include lithium iron phosphate, lithium manganese oxide, lithium cobalt oxide, ternary materials, etc. Lithium ions are in the lattice of the cathode material. Under normal charge and discharge conditions, the cathode material needs to deintercalate lithium ions and gain and lose electrons at the same time. In order to exert its performance, the transmission channels of its ions and electrons must be guaranteed. However, the above-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62C01B32/184C01B32/23
CPCH01M4/625Y02E60/10
Inventor 张彦林葛明马宇飞张磊殷松森丛霄张金宇高坡瞿研
Owner THE SIXTH ELEMENT CHANGZHOU MATERIALS TECH
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