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Method for preparing (V, Ti) 2AlC submicron sheets and nanoparticles

A nano-particle and sub-micron technology, applied in chemical instruments and methods, nanotechnology, inorganic chemistry, etc., can solve the problems of difficult to peel off the layered structure, affect the application, large force, etc., and achieve obvious lithium ion storage capacity, The effect of low cost and increased capacity

Pending Publication Date: 2020-12-01
YANCHENG INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] V 2 As one of the MAX phases, AlC is difficult to peel off into a layered structure such as graphene and BN because of the strong force between the MX layer and the A layer, which affects its application in the field of lithium-ion battery anode materials. application

Method used

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  • Method for preparing (V, Ti) 2AlC submicron sheets and nanoparticles
  • Method for preparing (V, Ti) 2AlC submicron sheets and nanoparticles
  • Method for preparing (V, Ti) 2AlC submicron sheets and nanoparticles

Examples

Experimental program
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Effect test

Embodiment 1

[0025] A preparation of (V,Ti) 2 The method for AlC submicron sheets and nanoparticles, comprising the steps of:

[0026] (1) The V powder, Ti powder, Al powder, Sn powder and C powder after drying (drying at 50°C for 18h) are placed in the QB- Grinding and mixing for 3 hours in a BP ball mill with a rotating speed controlled at 300 rpm to obtain a mixed powder;

[0027] (2) Add the mixed powder into the graphite crucible, and carry out high-temperature self-propagating synthesis under the protection of argon atmosphere (the argon pressure in the reactor is controlled to be 1.5 local atmospheric pressure). The high-temperature self-propagating synthesis temperature is 100-150°C, and the time is 4min, get (V 0.65 Ti 0.35 ) 2 AlC MAX phase material;

[0028] (3) will (V 0.65 Ti 0.35 ) 2 The AlC MAX phase material is crushed and ground to 300 mesh to obtain (V 0.65 Ti 0.35 ) 2 AlC powder, take 5g (V 0.65 Ti 0.35 ) 2 AlC powder was added to 80ml of absolute ethanol, ...

Embodiment 2

[0034] A preparation of (V,Ti) 2 The method for AlC submicron sheets and nanoparticles, comprising the steps of:

[0035] (1) Grind the V powder, Ti powder, Al powder and C powder after drying (dried at 60°C for 12h) in a QB-BP ball mill according to the molar ratio of 1.5:0.5:1:1 at a relative humidity of about 40%. Mix for 3 hours, and the speed is controlled at 300rpm to obtain a mixed powder;

[0036] (2) Add the mixed powder into the graphite crucible, and carry out high-temperature self-propagating synthesis under the protection of argon atmosphere (the argon pressure in the reactor is controlled to be 1.5 local atmospheric pressure). The high-temperature self-propagating synthesis temperature is 100-150°C, and the time is 5min, get (V 0.75 Ti 0.25 ) 2 AlC MAX phase material;

[0037] (3) will (V 0.75 Ti 0.25 ) 2 The AlC MAX phase material is crushed and ground to 300 mesh to obtain (V 0.75 Ti 0.25 ) 2 AlC powder, take 5g (V 0.75 Ti 0.25 ) 2 AlC powder was ...

Embodiment 3

[0041] A preparation of (V,Ti) 2 The method for AlC submicron sheets and nanoparticles, comprising the steps of:

[0042] (1) Grind the dried V powder, Ti powder, Al powder and C powder in a QB-BP ball mill at a relative humidity of about 40% in a molar ratio of 1.3:0.7:1:1 Mix for 3 hours, and the speed is controlled at 300rpm to obtain a mixed powder;

[0043] (2) Add the mixed powder into the graphite crucible, and carry out high-temperature self-propagating synthesis under the protection of argon atmosphere (the argon pressure in the reactor is controlled to be 1.5 local atmospheric pressure). The high-temperature self-propagating synthesis temperature is 100-150°C, and the time is 3min, get (V 0.65 Ti 0.35 ) 2 AlC MAX phase material;

[0044] (3) will (V 0.65 Ti 0.35 ) 2 The AlC MAX phase material is crushed and ground to 300 mesh to obtain (V 0.65 Ti 0.35 ) 2 AlC powder, take 5g (V 0.65 Ti 0.35 ) 2 AlC powder was added to 80ml of absolute ethanol, and the s...

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Abstract

The invention relates to a method for preparing (V, Ti) 2AlC submicron sheets and nanoparticles. The method comprises: mixing dried V powder, Ti powder, Al powder, Sn powder and C powder according toa molar ratio of (1.8-1): 1, (0.2-1): (0.2-1): (1-1.5): (0-0.35): (0.85-1.2), grinding in a ball mill, carrying out high-temperature self-propagating synthesis on the obtained powder in an argon atmosphere, so that (V, Ti) 2AlCMAX phase materials are obtained, crushing and grinding the (V, Ti) 2AlCMAX phase materials, carrying out solvent ultrasonic treatment, carrying out standing precipitation on a solution obtained after ultrasonic treatment for 2-5 days, taking an upper-layer solution, and carrying out centrifugation, wherein a lower-layer precipitate comprises (V, Ti) 2AlC submicron sheets, and the supernatant comprises a colloidal solution of (V, Ti) 2AlC nanoparticles. The method is low in energy consumption, safe, environmentally friendly, easy to operate, capable of saving time and low in cost, and the prepared (V, Ti) 2AlC submicron sheets and nanoparticles are suitable for being used as lithium ion battery negative electrode materials.

Description

technical field [0001] The present invention relates to a kind of preparation (V, Ti) 2 The invention relates to a method for AlC submicron sheets and nano particles, which belongs to the technical field of preparation of negative electrode materials for lithium ion batteries. Background technique [0002] The negative electrode material of traditional lithium-ion batteries is graphite, but graphite is only 372mAhg -1 Theoretical specific capacity, and the cycle life is poor, it is becoming more and more difficult to meet the requirements of equipment for high specific capacity of the battery. For this reason, many new anode materials have been studied, such as amorphous carbon, Si, SiO x , Sn, P, transition metal oxides, transition metal sulfides, etc., which greatly enrich the negative electrode materials of lithium-ion batteries. [0003] The concept of the MAX phase was first proposed by Barsoum in 2000, where M represents a class of early transition metal elements, A...

Claims

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Application Information

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IPC IPC(8): C01B32/90H01M4/583H01M10/0525B82Y40/00
CPCC01B32/90H01M4/583H01M10/0525B82Y40/00C01P2002/72C01P2004/03C01P2004/20C01P2004/64C01P2006/40H01M2004/021H01M2004/027Y02E60/10
Inventor 许剑光张宇杨丹刘志勇姚为
Owner YANCHENG INST OF TECH