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Graphene metal compound super capacitor electrode material and preparation method thereof

A technology of supercapacitors and metal composites, which is applied in the manufacture of hybrid capacitor electrodes and hybrid/electric double layer capacitors, etc., can solve the problems of reducing the specific surface area and specific capacity of graphene, poor conductivity of metal oxides, and unfavorable lithium battery cycles. Achieve the effects of increasing specific capacity and cycle stability, reducing the use of precious metals, and improving economic benefits

Active Publication Date: 2015-12-23
深圳市来源新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when each electrode material is applied to supercapacitors, it also exposes some shortcomings or defects while showing its advantages.
For example, metal oxides have poor conductivity and poor stability; reduced graphene oxide bends and floats, and its density is not good, which affects the conductive effect. In addition, both materials are oxides, and their functional groups are not conducive to lithium battery cycling; at the same time, graphene is A carbon material with a two-dimensional structure, which has an ideal monoatomic layer thickness and a theoretical specific surface area of ​​up to 2630m 2 g -1 , and good electrical conductivity and chemical stability, it is considered to be an ideal electric double layer capacitor material, but the existence of van der Waals force makes graphene easy to agglomerate, thereby reducing the specific surface area and specific capacity of graphene

Method used

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  • Graphene metal compound super capacitor electrode material and preparation method thereof
  • Graphene metal compound super capacitor electrode material and preparation method thereof

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preparation example Construction

[0025] The preparation method of above-mentioned graphene metal composite supercapacitor electrode material, comprises the steps:

[0026] 1) Add a certain proportion of expanded graphite flakes, metal and / or metal alloys, conductive polymers, and meltable polymers into the graphene peeling machine, and grind together for 10 to 16 hours in a vacuum state to prepare sheet-shaped graphene, sheet Nano-metal and / or sheet-like nano-metal alloy, mixed powder material of granular polymer; the sheet thickness of the sheet-like graphene is less than 100nm; sheet-like nano-metal and / or sheet-like nano-metal alloy The sheet thickness is less than 100nm; the average particle size of the polymer is less than 100nm.

[0027] 2) Pressurize or evacuate the mixed powder material in the reactor, raise the temperature to the melting point of the meltable polymer, keep it warm for 2-4 hours, and then lower it to room temperature to obtain the composite electrode material.

[0028] Wherein, the m...

Embodiment 1

[0033] Step 1: Take 0.25kg of high-purity expanded graphite, 0.25kg of copper powder, 0.1kg of polyaniline, and 0.2kg of polytetrafluoroethylene, put them into the grinding tank of the graphene peeling machine and add 16kg of 201 stainless steel balls, seal, vacuumize, and jacket The temperature of the circulating water is controlled at 35°C, the number of revolutions is 600 times / min, and the ball mill is impacted and rubbed for 12 hours. The grinding tank is removed, the ball material is taken out in a vacuum glove box, and the co-milled powder is obtained by sub-sieving. Wherein the thickness of the metal sheet and the graphene sheet are both below 100 nanometers, and the particle size of the polymer is also below 100 nanometers.

[0034] Step 2: Put the co-milled powder in a vacuum drying oven to vacuumize 0.08~0.1mpa, raise the temperature to 330°C, keep it warm for 2 hours, then stop vacuuming and open the air release valve, you can directly open the drying oven to contac...

Embodiment 2

[0037] Step 1: Take 0.25kg of an alloy powder for soldering (micron grade, containing 5% copper, 3% antimony, 3.5% bismuth, 2% silver, and tin as the balance), and 0.25 kg of high-purity expanded graphite kg, polyaniline 0.1kg, nylon 660.2kg, put into graphene peeling machine grinding tank, add 16kg of 210 stainless steel balls, seal, vacuumize 0.1mpa, jacket circulating water cooling temperature control at about 35 ℃, speed 600 times / min, Impact rubbing and cutting ball milling for 12 hours, remove the grinding tank, take out the ball material in the vacuum glove box, and sieve to obtain co-milled powder. The thickness of the metal sheet and graphene sheet is less than 100 nanometers, and the particle size of the polymer is also less than 100 nanometers.

[0038] Step 2: Put the co-milled powder in a vacuum drying oven, vacuum 0.08~0.1mpa, heat up to 260°C, keep warm for 2 hours, stop vacuuming and open the air release valve, take it out, and get a nanostructured supercapacit...

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Abstract

The invention provides a graphene metal compound super capacitor electrode material. The material is a compound product obtained by compounding sheet-like graphene and sheet-like nano metals and / or sheet-like nano metal alloys and conductive polymers, and the conductive polymers are embedded into adjacent sheet metal layers and sheet graphene layers. The preparation method involves adding expanded graphite flakes, the metals and / or the metal alloys, the conductive polymers and meltable polymers in certain proportions into a graphene stripping machine, grinding for 10 to 16 hours at a vacuum state and preparing a mixed powder material of the sheet-like graphene, the sheet-like nano metals and / or the sheet-like nano metal alloys and granular high-molecular polymers; and pressurizing or vacuumizing the mixed powder material in a reactor, increasing the temperature to the melting point temperature of the meltable polymers, performing insulation for 2 to 4 hours, then reducing the temperature to a room temperature and obtaining the combined electrode material. When the material and method are implemented, graphene aggregation and accumulation can be prevented, the available surface area of graphene is improved, and the electrochemical performance is high.

Description

technical field [0001] The invention relates to a supercapacitor electrode material and a preparation method thereof, in particular to a graphene metal composite supercapacitor electrode material and a preparation method thereof. Background technique [0002] Supercapacitor (Supercapacitor) is a new type of energy storage device developed at home and abroad in recent years between electrostatic capacitance and chemical power supply. It has both the high discharge power of electrostatic capacitors and the high energy density similar to batteries. It has the characteristics of no pollution to the environment, long cycle life, wide operating temperature range, high safety performance, etc., and has broad application prospects. With the development of social economy and the further strengthening of people's awareness of green energy and ecological environment protection, supercapacitors, as a new type of energy storage device, have attracted more and more attention because of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/24H01G11/30H01G11/36H01G11/48H01G11/86
CPCY02E60/13
Inventor 曲莱曲少忠
Owner 深圳市来源新材料科技有限公司
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