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Gum-containing composite carbon powder, preparation method thereof, and electrochemical capacitor made of the carbon powder

A technology of composite carbon and powder layer, applied in the field of electrochemistry, can solve the problems of limited range of energy density improvement, limited application range of capacitors, complicated preparation process, etc., to improve the effective capacitance, suppress the problem of lead deposition, and improve the packing density. Effect

Active Publication Date: 2018-09-25
SUZHOU YOURBEST NEW TYPE MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the proportion of the negative electrode current collector in the total mass of the negative electrode is still very high, the range of energy density improvement is limited, and the shortcomings of complex preparation processes are also obvious.
[0010] Existing PbO 2 / C asymmetric electrochemical capacitors have high power density and long cycle life, but their energy density is significantly lower than that of batteries, and they cannot meet the requirements of electric vehicles and hybrid electric vehicle power batteries, as well as energy storage batteries for solar and wind power stations. Greatly limit the scope of application of this type of capacitor

Method used

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  • Gum-containing composite carbon powder, preparation method thereof, and electrochemical capacitor made of the carbon powder
  • Gum-containing composite carbon powder, preparation method thereof, and electrochemical capacitor made of the carbon powder
  • Gum-containing composite carbon powder, preparation method thereof, and electrochemical capacitor made of the carbon powder

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] The preparation of embodiment 1 modified activated carbon particles

[0059] recombine Figure 4 As shown, the modified activated carbon particles are made of activated carbon 4, graphite powder 10, acetylene black 11, and fluororubber granulation 12. The weight ratio of each component is as follows: activated carbon 70%, graphite powder 20%, acetylene black 5%, fluororubber 5%, of which activated carbon is used with a specific surface area of ​​1500m 2 / g, commercial activated carbon with a mesoporosity greater than 40%, and an average particle size of 5-10 μm; a commercial product of graphite powder with an average particle size of 800 mesh; acetylene black with a specific surface area of ​​70m 2 / g, a commercial product with an average particle size of 35nm and a powder resistance of 0.19Ωcm.

[0060] First, dry-mix activated carbon, graphite powder and acetylene black for 5 minutes, add water to make a slurry, stir for 7 hours, and mix well. Then filter the slurr...

Embodiment 2

[0061] The preparation of embodiment 2 negative plate

[0062] The weight ratio of each material component of the composite carbon powder containing glue is as follows: modified activated carbon particles 90%, graphite powder 5%, epoxy resin 5% (emulsion) prepared by embodiment 1, wherein the modified activated carbon particles are through appropriate pulverizing and grinding, Take the part that has passed through the 40 mesh sieve but not passed the 100 mesh sieve, and the tapped bulk density is 0.65g / cm 3 ; Graphite powder is a commercial product with an average particle size of 800 objects.

[0063] First dry mix the modified activated carbon particles and graphite powder for 5 minutes, wet them with 40% by weight of water of the modified activated carbon particles, and continue mixing for 15 minutes, then add the pre-mixed two-component epoxy resin (emulsion) (also known as AB glue), stir for 10 minutes, mix thoroughly, and make composite toner with glue. Then, the compo...

Embodiment 3

[0067] The preparation of embodiment 3 modified activated carbon particles

[0068] The binder of the modified active carbon particles is PTFE (content 70%) emulsion; the weight ratio of each component is as follows: carbon nanofiber 60%, acetylene black 20%, graphene 5%, PTFE (content 70%) emulsion 15%.

[0069] Dry mix carbon nanofibers, graphene and acetylene black for 5 minutes, add water to make a slurry, stir for 8 hours, and mix well. Then the slurry was suction filtered to remove the apparent moisture, and then PTFE (polytetrafluoroethylene) (content 70%) emulsion was added, stirred for 1 hour, and fully mixed. At 75°C, dry for 2 hours until it is semi-dry, then roll the mixed material repeatedly, and heat the mixed material with infrared rays at the same time until the powder is in the form of flakes or granules, and finally dry at 120°C for 2 hours to obtain Modified activated carbon granules.

[0070] All the other are identical with embodiment 2.

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Abstract

The invention discloses glue-containing composite carbon powder and a preparation method therefor, and an electrochemical capacitor manufactured from the carbon powder. The glue-containing composite carbon powder comprises 70-90wt% of modified active carbon granules, 5-20wt% of conductive agent and 5-10wt% of binder; the preparation method comprises the following steps of weighing a proper amount of the modified active carbon granules and conductive agent, then enabling the weighed modified active carbon granules and conductive agent to be mixed in a dry manner, then adding water to mix uniformly to obtain a raw material mixture; then weighing a proper amount of binder, and adding the weighed binder to the raw material mixture to be uniformly mixed to obtain the glue-containing composite carbon powder. According to an active carbon negative electrode plate of the capacitor, due to the combined action of the microstructural three-dimensional conductive network in the modified active carbon granules and the three-dimensional conductive network in the electrode, the equivalent series resistance of the electrode is lowered, and the capacity is obviously improved; meanwhile, the lead deposition problem existing in the electrode in the charge-discharge process of the active carbon negative electrode plate is restrained; and furthermore, the electrochemical capacitor has the features of high capacity and long service life.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and in particular relates to a composite carbon powder containing glue, a preparation method thereof, and an electrochemical capacitor made of the carbon powder. Background technique [0002] With the continuous development of the economy, energy, resources and the environment have become the focus of society. It is an urgent and arduous task for human society to find clean, renewable and resource-saving energy. [0003] Currently, there are three main types of energy storage devices in the energy field: batteries, physical capacitors, and electrochemical capacitors (also known as supercapacitors). Electrochemical capacitor is a new type of green energy storage device developed in recent years between the characteristics of traditional physical capacitors and batteries. It has fast charge and discharge characteristics, high power density (more than several dozen times that of ordinary ba...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/86H01G11/42H01G11/32
CPCY02E60/13
Inventor 肖锋高建峰王力臻
Owner SUZHOU YOURBEST NEW TYPE MATERIALS