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A kind of in-situ self-assembled three-dimensional flower-like cobalt disulfide/mxene composite material and its preparation method and application

A three-dimensional flower-shaped, composite material technology, applied in structural parts, electrical components, battery electrodes, etc., can solve the problem of not fully exerting the reflected value, and achieve excellent charge-discharge cycle performance and rate performance, high first Coulomb efficiency, The effect of high specific capacity electrical conductivity

Active Publication Date: 2022-06-03
GUANGDONG UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the preparation of new lithium-ion composite materials, its special value has not been fully utilized
In particular, no studies have reported the in situ growth of cobalt disulfide nanoflower-like three-dimensional Li-ion composites on two-dimensional MXene nanosheets.

Method used

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  • A kind of in-situ self-assembled three-dimensional flower-like cobalt disulfide/mxene composite material and its preparation method and application
  • A kind of in-situ self-assembled three-dimensional flower-like cobalt disulfide/mxene composite material and its preparation method and application

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 1. 5mmol CoSO 4 ·7H 2 O and 10 mmol Na 2 S were dissolved in 40 mL of deionized water to obtain pink A solution and transparent B solution;

[0032] 2. Slowly add solution A described in step 1 to solution B and mix well, stir well for 30 min to obtain light red solution C;

[0033] 3. Weigh an aqueous solution containing 50 mg of MXene and add it to solution C in step 2, stir for 30 min, and ultrasonically disperse for 10 min to obtain MXene mixed solution D;

[0034] 4. Pour the solution D described in step 3 into a 100 mL stainless steel reaction kettle, then put it into a blast drying oven, keep the temperature at 150 ° C for 36 hours, and then carry out suction filtration after cooling in the furnace to obtain solid D;

[0035] 5. After the solid D described in step 4 is placed in freeze-drying for 24 hours, the in-situ self-assembled nano-flower-like cobalt disulfide / MXene composite material is obtained.

[0036] figure 1 This is the scanning electron microscop...

Embodiment 2

[0038] 1. 3 mmol CoCl 2 ·6H 2 O and 3mmol TAA (thioacetamide) were dissolved in 40mL deionized water respectively to obtain pink A solution and transparent B solution;

[0039] 2. Slowly add solution A in step 1 to solution B and mix well, stir well for 30 min to obtain light red solution C;

[0040] 3. Weigh the aqueous solution containing 30 mg of MXene and add it to solution C in step 2, stir for 30 min, and ultrasonically disperse for 10 min to obtain MXene mixed solution D;

[0041] 4. Pour the solution D in step 3 into a 100mL stainless steel reaction kettle, then put it into a blast drying oven, keep it at 150 ° C for 36 hours, and then carry out suction filtration after cooling in the furnace to obtain solid D;

[0042] 5. After the solid D in step 4 is placed in a freezer for 24 hours for drying, the in-situ self-assembled nano-flower-like cobalt disulfide / MXene composite material is obtained.

Embodiment 3

[0044] 1. Put 3mmolC 4 H 6 CoO 4 and 3mmol L-cysteine ​​were respectively dissolved in 40mL deionized water to obtain A solution and B solution;

[0045] 2. Slowly add solution A in step 1 to solution B and mix well, stir well for 30 min to obtain light red solution C;

[0046] 3. Weigh the aqueous solution containing 30 mg of MXene and add it to solution C in step 2, stir for 30 min, and ultrasonically disperse for 10 min to obtain MXene mixed solution D;

[0047] 4. Pour the solution D in step 3 into a 100 mL stainless steel reaction kettle, and then put it into a blast drying oven, keep it at 280 ° C for 12 hours, and then perform suction filtration after cooling in the furnace to obtain solid D;

[0048] 5. After the solid D in step 4 is placed in a freezer for 24 hours for drying, the in-situ self-assembled nano-flower-like cobalt disulfide / MXene composite material is obtained.

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Abstract

The invention discloses an in-situ self-assembled three-dimensional flower-shaped cobalt disulfide / MXene composite material and its preparation method and application. The composite material is a mixed solution obtained by stirring a soluble cobalt salt aqueous solution and a vulcanizing agent aqueous solution, and adding the MXene aqueous solution Stir in the mixed solution and ultrasonically disperse to obtain the MXene mixed solution; the MXene mixed solution undergoes a hydrothermal reaction at 150-280° C., then undergoes suction filtration after cooling in a furnace, and obtains a solid after drying; and freeze-dries the solid. The invention is self-assembled on the MXene nanosheet matrix through electrostatic interaction, and the matrix can effectively accommodate the volume effect of cobalt disulfide in the charge and discharge process, and the composite material has excellent charge and discharge cycle performance, rate performance and high first Coulomb efficiency.

Description

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

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/58
CPCH01M4/366H01M4/5815Y02E60/10
Inventor 廖松义闵永刚刘屹东王勇李越珠
Owner GUANGDONG UNIV OF TECH
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