Electrostatic self-assembly three-dimensional flower-like cobalt disulfide/MXene composite material and preparation method and application thereof

An electrostatic self-assembly, three-dimensional flower-like technology, applied in nanotechnology, electrochemical generators, circuits, etc. for materials and surface science, to achieve high specific capacity, prevent collapse, and good cycle stability

Active Publication Date: 2019-11-05
GUANGDONG UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In particular, there is no patent report so far that the electrostatic self-assembly of three-dimensional flower-like cobalt disulfide on MXene nanosheets to form a composite material with a 3D structure, in addition to the excellent performance exhibited on lithium-ion battery anode materials, in other fields (sodium Ion batteries / catalytic ORE, etc.) will also be favored by scientists

Method used

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  • Electrostatic self-assembly three-dimensional flower-like cobalt disulfide/MXene composite material and preparation method and application thereof
  • Electrostatic self-assembly three-dimensional flower-like cobalt disulfide/MXene composite material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] 1. Mix 5mmol CoSO 4 ·7H 2 O and 10mmol Na 2 Dissolve S in 40mL deionized water respectively to obtain pink A solution and transparent B solution;

[0035] 2. Slowly add the A solution described in step 1 into the B solution and mix evenly, then fully stir for 30 minutes to obtain a light red C solution;

[0036] 3. Pour the solution C described in step 2 into a stainless steel reaction kettle, then put it into a blast drying oven and heat it at 150°C for 36 hours, then carry out suction filtration after cooling in the furnace, and obtain solid D after drying;

[0037] 4. Dilute 4ml of 20wt.% polydiallyldimethylammonium chloride (PDDA) solution with 100mL of deionized water, put 200mg of solid D obtained in step 3 into it and stir for a period of time, and obtain solid E;

[0038] 5. Weigh the aqueous solution containing 50mg of MXene, add 100mL of deionized water to dilute, put 200mg of solid E obtained in step 4 into it, stir it thoroughly and let it stand for 24 hou...

Embodiment 2

[0042] 1. Add 3mmol CoCl 2 ·6H 2 0 and 3mmol TAA (thioacetamide) were dissolved in 40mL deionized water respectively to obtain pink A solution and transparent B solution;

[0043] 2. Slowly add the A solution described in step 1 into the B solution and mix evenly, then fully stir for 30 minutes to obtain a light red C solution;

[0044] 3. Pour the solution C described in step 2 into a stainless steel reaction kettle, then put it into a blast drying oven and heat it at 150°C for 36 hours, then carry out suction filtration after cooling in the furnace, and obtain solid D after drying;

[0045] 4. Dilute 4ml of 20wt.% polydiallyldimethylammonium chloride (PDDA) solution with 100mL of deionized water, put 200mg of solid D obtained in step 3 into it and stir for a period of time, and obtain solid E;

[0046] 5. Weigh the aqueous solution containing 50mg of MXene, add 100mL of deionized water to dilute, put 200mg of solid E obtained in step 4 into it, stir it thoroughly and let ...

Embodiment 3

[0049] 1. Add 3mmol CoCl 2 ·6H 2 0 and 3mmol L-cysteine ​​were dissolved in 40mL deionized water respectively to obtain pink A solution and B solution;

[0050] 2. Slowly add the A solution described in step 1 into the B solution and mix evenly, then fully stir for 30 minutes to obtain a light red C solution;

[0051] 3. Pour the solution C described in step 2 into a stainless steel reaction kettle, then put it into a blast drying oven and heat it at 280°C for 36 hours, then carry out suction filtration after cooling in the furnace, and obtain solid D after drying;

[0052] 4. Dilute 4ml of 25wt.% polydiallyldimethylammonium chloride (PDDA) solution with 100mL of deionized water, put 200mg of solid D obtained in step 3 into it and stir for a period of time, and obtain solid E;

[0053] 5. Weigh the aqueous solution containing 5mg of MXene, add 100mL of deionized water to dilute, put 200mg of solid E obtained in step 4 into it, stir it thoroughly and let it stand for 35h, th...

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Abstract

The invention discloses an electrostatic self-assembly three-dimensional flower-like cobalt disulfide/MXene composite material and a preparation method and application thereof. The composite materialis prepared by the following steps: stirring a soluble cobalt salt aqueous solution and a vulcanizing agent aqueous solution to obtain a mixed solution, carrying out hydrothermal reaction on the mixedsolution at 150-280 DEG C, performing cooling along with a furnace, carrying out suction filtration, and carrying out drying to obtain a solid A; adding the solid A into a polydiallyldimethylammoniumchloride solution, performing stirring, and performing washing to obtain a solid B; putting the solid B into an MXene aqueous solution, performing stirring, performing standing, carrying out centrifugal washing, and carrying out freeze drying to obtain a solid C; and under the protection of nitrogen, calcining the solid C at 500-700 DEG C to obtain the composite material. The composite material is self-assembled on an MXene nanosheet substrate through electrostatic interaction, the substrate can effectively accommodate the volume effect of cobalt disulfide in the charging and discharging process, and the composite material has excellent charging and discharging cycle performances, rate capability and high initial coulombic efficiency.

Description

technical field [0001] The invention belongs to the technical field of negative electrode materials for lithium ion batteries, and more specifically relates to an electrostatic self-assembled three-dimensional flower-like cobalt disulfide / MXene composite material and its preparation method and application. Background technique [0002] With the progress and development of society, the energy problems faced by human beings have become increasingly prominent. Lithium-ion battery, as the most successful commercial energy storage device at present, alleviates some of people's concerns about energy storage, so it has been favored by people from all walks of life. In particular, lithium-ion batteries have been widely developed and applied in the field of electric vehicles due to their green / environmental protection and recyclable advantages. At present, the negative electrode active materials used in lithium-ion batteries on the market are usually graphite materials with good con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62B82Y30/00H01M10/0525
CPCH01M4/362H01M4/5815H01M4/62B82Y30/00H01M10/0525Y02E60/10
Inventor 廖松义闵永刚刘屹东王勇李越珠
Owner GUANGDONG UNIV OF TECH
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