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A mechanochemical polymerization method for preparing graphene/metal oxide composite electrode materials

A mechanochemical method and in-situ preparation technology, which is applied in the field of mechanochemical in-situ preparation of graphene/metal oxide composite electrode materials, can solve problems such as high efficiency and large-scale preparation of unfavorable composite energy storage electrode materials, and achieve high yield High, simple process, high synthesis efficiency

Inactive Publication Date: 2019-01-15
SOUTH CENTRAL UNIVERSITY FOR NATIONALITIES +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above patented methods all need to prepare graphene separately, then compound with metal oxide precursors, and then reduce graphene and other complex processes, which is not conducive to the efficient and large-scale preparation of graphene / metal oxide composite energy storage electrode materials.

Method used

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  • A mechanochemical polymerization method for preparing graphene/metal oxide composite electrode materials
  • A mechanochemical polymerization method for preparing graphene/metal oxide composite electrode materials

Examples

Experimental program
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Effect test

Embodiment 1

[0022] In the first example, the graphene / manganese dioxide composite electrode material was prepared by mechanochemical polymerization.

[0023] Preparation:

[0024] (1) Take 0.2 g of 100-mesh flake graphite and 1.58 g of potassium permanganate, add it to 50 mL of deionized water, mix evenly, and sonicate for 10 min, as liquid A.

[0025] (2) Add 2.27g of manganese sulfate and 0.5g of Tween 80 into 50mL of aqueous solution, stir for 30min, and use it as liquid B.

[0026] (3) Mix liquid A and liquid B evenly, and process it with a sand mill for 6 hours at a rotational speed of 2000 rpm to obtain mixture C.

[0027] (4) The mixture C was repeatedly washed with deionized water, filtered, washed with ethanol, filtered, and then vacuum-dried at 80° C. for 24 hours to obtain a graphene / manganese dioxide composite electrode material.

[0028] In this embodiment one, potassium permanganate and manganese sulfate are used as ion intercalation agents to promote graphite exfoliation ...

Embodiment 2

[0033] In the second embodiment, the graphene / cobalt tetroxide composite electrode material is prepared by mechanochemical polymerization, which specifically includes the following steps:

[0034](1) Take 0.25g of 80-mesh artificial graphite and 2.91g of cobalt nitrate hexahydrate, add it to 50mL of ethanol aqueous solution (volume ratio 1:1), mix evenly, and sonicate for 10min as liquid A.

[0035] (2) Take 8g of ammonium bicarbonate and 2.5g of polyoxyethylene ether, add it to 50mL of ethanol aqueous solution (volume ratio 1:1), stir for 30min, and use it as liquid B.

[0036] (3) Mix liquid A and liquid B evenly, and process it with a high-speed shear disperser for 2 hours at a rotation speed of 20,000 rpm, and control the reaction temperature to <50°C to obtain mixture C.

[0037] (4) The mixture C was repeatedly washed with ionized water and ethanol, filtered, and then vacuum-dried at 60° C. for 12 h to obtain complex D.

[0038] (5) The composite D was transferred to a ...

Embodiment 3

[0040] In this embodiment three, prepare graphene / NiCo by mechanochemical polymerization 2 o 4 Composite electrode material The composite electrode material specifically comprises the following steps:

[0041] (1) Take 0.5 g of 325-mesh expanded graphite, 1.77 g of nickel acetate, and 3.54 g of cobalt acetate and mix them uniformly as solid mixture A.

[0042] (2) Add 1.2 g of sodium hydroxide to the solid mixture A, mix well, and use it as the solid mixture B.

[0043] (3) The solid mixture B was transferred to a ball mill and sealed, and the solid phase mechanical ball mill was reacted for 6 hours at a rotation speed of 300 rpm to obtain a solid mixture C.

[0044] (4) The solid mixture C was repeatedly washed with deionized water and ethanol, filtered, and then vacuum-dried at 60° C. for 12 hours to obtain complex D,

[0045] (5) Transfer compound D to a tube furnace and treat it in an air atmosphere at 350°C for 4h to obtain graphene / NiCo 2 o 4 Composite electrode mat...

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Abstract

A mechanochemical polymerization method for preparing graphene / metal oxide composite electrode material features that graphite and metal oxide precursor are adde into a mechanochemical reactor as rawmaterials to obtain graphene / metal oxide composite electrode material by one-step mechanochemical reaction. That graphene / metal oxide composite electrode material is prepared by adding graphite and metal oxide precursor as raw material to a mechanochemical reactor. A metal oxide precursor in that invention is a multifunctional reagent, As that ion intercalation agent, Graphene is prepare by accelerating graphite peel under that action of mechanical force, On the other hand, Graphene / metal oxide composite electrode material are obtained by in-situ formation of metal oxide on that surface of graphene due to simultaneous mechanical chemical reaction of metal salts, so that a plurality of processes such as preparation of graphene, in-situ load metal oxide and the like are completed in one step, and the preparation process is simplified, and the preparation efficiency of graphene / metal oxide composite material is improved.

Description

technical field [0001] The invention belongs to the field of composite material preparation, and in particular relates to the in-situ preparation of graphene / metal oxide composite electrode materials by a mechanochemical method. technical background [0002] With the rapid growth of demand for electronic devices such as mobile phones, electric tools, electric buses, and electric vehicles, the demand for energy storage devices with high energy density and high power density is also growing rapidly. Compared with traditional capacitors, supercapacitors have relatively high energy density and high power density compared with batteries, which is one of the energy storage devices with superior performance. Supercapacitors are divided into two types: electric double layer energy storage capacitors and pseudocapacitive energy storage capacitors. Among them, pseudocapacitive energy storage capacitors can provide higher energy density by using redox reactions on the surface of electr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/30H01G11/36H01G11/46H01G11/24
CPCH01G11/24H01G11/30H01G11/36H01G11/46Y02E60/13
Inventor 杨应奎王相刚邱胜强何承恩章庆
Owner SOUTH CENTRAL UNIVERSITY FOR NATIONALITIES
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