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Electrostatic self-assembly spherical molybdenum trioxide/MXene composite material as well as preparation method and application thereof

A technology of electrostatic self-assembly and molybdenum trioxide, applied in nanotechnology, electrochemical generators, circuits, etc. for materials and surface science, to achieve easy contact, excellent charge-discharge cycle performance and rate performance, and high specific capacity Effect

Pending Publication Date: 2021-03-16
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In particular, there is no patent report on the electrostatic self-assembly of spherical molybdenum trioxide on MXene nanosheets to form a composite material with a 3D structure

Method used

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  • Electrostatic self-assembly spherical molybdenum trioxide/MXene composite material as well as preparation method and application thereof
  • Electrostatic self-assembly spherical molybdenum trioxide/MXene composite material as well as preparation method and application thereof
  • Electrostatic self-assembly spherical molybdenum trioxide/MXene composite material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] 1. Add 1mmol MoO 2 (acac) 2 Add to 50mL ethanol, stir to obtain A solution;

[0034] 2. Pour the solution A described in step 1 into a stainless steel reaction kettle, then put it into a blast drying oven and heat it to 200°C for 48 hours, then carry out centrifugal washing after cooling in the furnace, and obtain solid B after drying;

[0035] 3. Put the solid B described in step 2 into a rapid heating resistance furnace, and heat it up to 450°C for 3 hours in an air atmosphere to obtain solid C;

[0036] 4. After diluting 0.1ml of 20wt.% polydiallyldimethylammonium chloride (PDDA) solution with 200mL of deionized water, put 200mg of solid C obtained in step 3 into it and stir for a while, then wash by centrifugation To obtain solid D, add deionized water to a concentration of 1 mg / mL, and stir evenly to obtain solution E;

[0037] 5. Measure the aqueous solution containing 25mg of MXene, add water to dilute it to 25mL, and add it to the 225mL solution E obtained in s...

Embodiment 2

[0040] 1. Add 1mmol MoO 2 (acac) 2 Add to 50mL ethanol, stir to obtain A solution;

[0041] 2. Pour the solution A described in step 1 into a stainless steel reaction kettle, then put it into a blast drying oven and heat it to 200°C for 48 hours, then carry out centrifugal washing after cooling in the furnace, and obtain solid B after drying;

[0042] 3. Put the solid B described in step 2 into a rapid heating resistance furnace, and heat it up to 450°C for 3 hours in an air atmosphere to obtain solid C;

[0043] 4. After diluting 0.1ml of 20wt.% polydiallyldimethylammonium chloride (PDDA) solution with 200mL of deionized water, put 200mg of solid C obtained in step 3 into it and stir for a while, then wash by centrifugation To obtain solid D, add deionized water to a concentration of 1 mg / mL, and stir evenly to obtain solution E;

[0044] 5. Measure the aqueous solution containing 50mg of MXene, add water to dilute to 50mL, and add it to the 200mL solution E obtained in st...

Embodiment 3

[0047] 1. Add 1mmol MoO 2 (acac) 2 Add to 50mL ethanol, stir to obtain A solution;

[0048] 2. Pour the solution A described in step 1 into a stainless steel reaction kettle, then put it into a blast drying oven and heat it to 200°C for 48 hours, then carry out centrifugal washing after cooling in the furnace, and obtain solid B after drying;

[0049] 3. Put the solid B described in step 2 into a rapid heating resistance furnace, and heat it up to 450°C for 3 hours in an air atmosphere to obtain solid C;

[0050] 4. After diluting 0.1ml of 20wt.% polydiallyldimethylammonium chloride (PDDA) solution with 200mL of deionized water, put 200mg of solid C obtained in step 3 into it and stir for a while, then wash by centrifugation To obtain solid D, add deionized water to a concentration of 1 mg / mL, and stir evenly to obtain solution E;

[0051] 5. Measure the aqueous solution containing 125mg of MXene, add water to dilute it to 125mL, and add it to the 125mL solution E obtained ...

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Abstract

The invention discloses an electrostatic self-assembly spherical molybdenum trioxide / MXene composite material as well as a preparation method and application thereof. The composite material is prepared by the following steps: dissolving soluble molybdenum acetylacetonate in ethanol, stirring to obtain a mixed solution, carrying out solvothermal reaction at 150-280 DEG C, cooling along with a furnace, washing, filtering, drying, and calcining at 400-600 DEG C to obtain a solid A; adding the solid A into a polydiallyldimethylammonium chloride solution, stirring, and centrifugally washing to obtain a solid B; dropwise adding an MXene aqueous solution into the solid B aqueous solution, stirring, standing, carrying out centrifugal washing, and carrying out freeze drying to obtain a solid C; andunder the protection of nitrogen, calcining the solid C at 400-600 DEG C to obtain the material. The composite material is self-assembled on an MXene nanosheet matrix through electrostatic interaction, the matrix can effectively accommodate the volume effect of molybdenum trioxide in the charging and discharging process, and the composite material has excellent charging and discharging cycle performance, 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 spherical molybdenum trioxide / MXene composite material and its preparation method and application. Background technique [0002] With the progress of society and the rapid development of economy, the energy problems faced by mankind have become increasingly prominent. Lithium-ion batteries are widely used in various electronics, power tools, and electric vehicles due to their high energy density, long cycle life, and environmental friendliness. However, the theoretical capacity of graphite anode for traditional lithium-ion batteries is 372mAh / g, which is difficult to meet the rapidly growing demand for high energy density. There is an urgent need to develop a new type of electrode material to obtain a new type of lithium-ion battery with higher energy density, longer cycle life, and fa...

Claims

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Application Information

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IPC IPC(8): H01M4/48H01M4/62H01M10/0525B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/483H01M4/625H01M4/628H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 黄流春唐新村李星
Owner CENT SOUTH UNIV
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