Method for preparing grapheme/cobalt-nickel bimetallic hydroxide

A hydroxide and graphene technology, used in the manufacture of hybrid/electric double layer capacitors, hybrid capacitor electrodes, etc. High capacitance, convenient for batch and large-scale preparation, and good cycle stability

Inactive Publication Date: 2017-11-24
浙江美都墨烯科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the poor electrical conductivity of bimetallic hydroxides will reduce their cycle stability and rate performance. An effective way to improve the above shortcomings is to combine them with substances with high electrical conductivity, such as carbon nanotubes, graphite, etc. ene, etc., to obtain a class of composite materials, which can not only exert the high energy storage characteristics of hydroxides, but also improve their electrical conductivity through carbon materials to achieve high comprehensive performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Select natural high-purity graphite powder with an average particle size of 5 microns, oxidize it with concentrated nitric acid and potassium permanganate in sequence, wash the graphite powder with a large amount of water after filtration; then put the graphite powder into a microwave oven and expand it to obtain expanded worms Graphite powder; add N-methylpyrrolidone to ultrasonic vibration, ultrasonic vibration, and centrifugation, take out 100mL of the 5mg / mL upper layer suspension, add 0.025mol cobalt acetate tetrahydrate and 0.075mol nickel acetate tetrahydrate, stir evenly, load Put it into a reaction kettle with a total volume of 120mL, react at 180 degrees for 1 hour, cool, filter, wash, and dry to obtain graphene / cobalt-nickel double metal hydroxide. In 2mol / L KOH aqueous solution, the specific capacitance of the single-electrode test is 1185F / g, and after 10,000 charge-discharge cycles, the specific capacitance retention rate is 92%.

Embodiment 2

[0021] Select natural high-purity graphite powder with an average particle size of 1 micron, oxidize it with concentrated nitric acid and potassium permanganate in sequence, wash the graphite powder with a large amount of water after filtration; then put the graphite powder into a microwave oven and expand it to obtain expanded worms Graphite powder; add N-methylpyrrolidone to ultrasonic vibration, ultrasonic vibration, and centrifugation, take out 100 mL of the 1 mg / mL upper suspension, add 0.001 mol of cobalt nitrate hexahydrate and 0.009 mol of nickel nitrate hexahydrate, stir well, load Put it into a reaction kettle with a total volume of 140mL, react at 200 degrees for 2 hours, cool, filter, wash, and dry to obtain graphene / cobalt-nickel double metal hydroxide. In 2mol / L KOH aqueous solution, the specific capacitance of the single-electrode test is 1476F / g, and after 5000 charge-discharge cycles, the specific capacitance retention rate is 95%.

Embodiment 3

[0023] Select natural high-purity graphite powder with an average particle size of 100 microns, oxidize it with concentrated nitric acid and potassium permanganate in sequence, wash the graphite powder with a large amount of water after filtration; then put the graphite powder into a microwave oven and expand it to obtain expanded worms Graphite powder; add N-methylpyrrolidone to ultrasonic vibration, ultrasonic vibration, and centrifugation, take out 100mL of the 10mg / mL upper layer suspension, add 0.009mol cobalt acetate tetrahydrate and 0.001mol nickel acetate tetrahydrate, stir evenly, load Put it into a reaction kettle with a total volume of 125mL, react at 200°C for 2 hours, cool, filter, wash, and dry to obtain graphene / cobalt-nickel double metal hydroxide. In a 2mol / L KOH aqueous solution, the specific capacitance of the single-electrode test is 1064F / g, and after 10,000 charge-discharge cycles, the specific capacitance retention rate is 97%.

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PUM

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Abstract

The invention discloses a method for preparing grapheme/cobalt-nickel bimetallic hydroxide. The method comprises the following steps: selecting graphite powder with certain granularity, performing oxidation treatment, filtering and cleaning to obtain graphite powder, then performing microwave expansion on the graphite powder to obtain expanded worm graphite powder, placing the expanded worm graphite powder in an N-methyl pyrrolidone solvent, performing ultrasonic concussion and centrifugal separation, extracting suspension liquid on the upper layer, placing a cobalt salt and a nickel salt with a certain molar ratio therein to obtain a precursor with certain concentration, placing the precursor in a high pressure reactor for heating, filtering, cleaning and drying the product after cooling the same to obtain the grapheme/cobalt-nickel bimetallic hydroxide. The composite material has the advantages of cheap raw materials, low cost, good electrode storage effect and so on, and can be applied to the electrode materials and electrochemical catalysis of supercapacitors.

Description

technical field [0001] The invention relates to the field of preparation of functional composite functional materials, and mainly relates to a method for preparing composite nanomaterials with low production cost, light weight and good energy storage effect. Background technique [0002] In terms of energy storage mechanism, supercapacitors can be divided into electric double layer capacitors and pseudocapacitors. It is a new type of energy storage device, which has the characteristics of high power density, short charging time, long service life, good temperature characteristics, energy saving and environmental protection. According to its energy storage mechanism, it can be divided into electric double layer supercapacitors and pseudocapacitive supercapacitors. Electric double layer supercapacitors mainly use activated carbon, carbon fiber, carbon aerogel, carbon nanotubes or graphene as electrode materials. , the mechanism by which electric field adsorbs charges to store...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/32H01G11/30H01G11/86
CPCY02E60/13H01G11/32H01G11/30H01G11/86
Inventor 程继鹏吴勇军翁永堂
Owner 浙江美都墨烯科技有限公司
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