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Mechanochemical preparation method of Ti3C2Tx with high lithium storage capacity

A mechanochemical method and mechanochemical reaction technology, applied in electrochemical generators, carbides, titanium carbides, etc., can solve problems such as low capacity, and achieve the effects of low cost, low pollution, and simple and controllable process.

Inactive Publication Date: 2020-06-05
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the Ti constructed by the above method 3 C 2 T x The capacity of the material is still far below the theoretical capacity, so it is urgent to find a simple and feasible strategy to further increase its lithium storage capacity

Method used

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  • Mechanochemical preparation method of Ti3C2Tx with high lithium storage capacity
  • Mechanochemical preparation method of Ti3C2Tx with high lithium storage capacity
  • Mechanochemical preparation method of Ti3C2Tx with high lithium storage capacity

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Ti 3 AlC 2 Put it into a stainless steel reactor with a total sample weight of 1.0 g, fill it with nitrogen and seal it, and react mechanically at 300 rpm for 12 hours. Dissolve 15.0g of sodium hydroxide in 10mL of deionized water, cool to room temperature, pass nitrogen gas for 5 minutes, add strong alkali solution into the above reactor, fill with nitrogen gas again to seal, rotate at 300rpm, and perform mechanochemical reaction for 12 hours. After the above reactor was cooled to room temperature, deionized water was added under nitrogen protection and ice bath. After cooling to room temperature, the mixed solution was centrifuged at 9000 rpm until neutral. Add deionized water to the precipitate and centrifuge at 3500rpm for 5min, take the supernatant, freeze-dry, and finally obtain the mechanochemically prepared Ti 3 C 2 T x .

[0023] Take the mass ratio of 8:1:1, take the Ti prepared by Mechanochemistry in Example 1 3 C 2 T x, conductive carbon black, sodi...

Embodiment 2

[0025] Ti 3 AlC 2 Put it into a stainless steel reactor with a total sample weight of 1.0 g, fill it with nitrogen and seal it, and react mechanically at 300 rpm for 12 hours. Dissolve 7.5g of sodium hydroxide in 10mL of deionized water, cool to room temperature, and pass nitrogen gas for 5 minutes, then add the strong alkali solution into the above-mentioned reactor, fill it with nitrogen again and seal it, the rotation speed is 300rpm, and the mechanochemical reaction takes 12 hours. After the above reactor was cooled to room temperature, deionized water was added under nitrogen protection and ice bath. After cooling to room temperature, the mixed solution was centrifuged at 9000 rpm until neutral. Add deionized water to the precipitate and centrifuge at 3500rpm for 5min, take the supernatant, freeze-dry, and finally obtain the mechanochemically prepared Ti 3 C 2 T x .

[0026] Take the mass ratio of 8:1:1, and take the Ti prepared by Mechanochemistry in Example 2 3 C...

Embodiment 3

[0028] Ti 3 AlC 2 Put it into a stainless steel reactor, the total weight of the sample is 1.0g, fill it with nitrogen and seal it, and react mechanically at 300rpm for 6h. Dissolve 15.0g of sodium hydroxide in 10mL of deionized water, cool to room temperature, pass nitrogen gas for 5 minutes, add strong alkali solution into the above reactor, fill with nitrogen again to seal, rotate at 300rpm, and perform mechanochemical reaction for 12 hours. After the above reactor was cooled to room temperature, deionized water was added under nitrogen protection and ice bath. After cooling to room temperature, the mixed solution was centrifuged at 9000 rpm until neutral. Add deionized water to the precipitate and centrifuge at 3500rpm for 5min, take the supernatant, freeze-dry, and finally obtain the mechanochemically prepared Ti 3 C 2 T x .

[0029] Take the mass ratio of 8:1:1, weigh the Ti prepared by the mechanochemistry of Example 3 3 C 2 T x , conductive carbon black, sodiu...

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Abstract

The invention provides a mechanochemical method for preparing Ti3C2Tx with high lithium storage capacity, and belongs to the technical field of preparation of MXene (MXene). According to the method, MAX-phase Ti3AlC2 is used as a raw material, and in a strong alkali environment, a stable small-size Ti3C2Tx is prepared by applying a mechanical force to induce a chemical reaction. The material has atwo-dimensional nanosheet structure, large interlayer spacing and stable surface characteristics. Due to the abundant exposed edges and the large specific surface area, the number of lithium storageactive sites is increased, full contact with an electrolyte and transmission and diffusion of lithium ions are facilitated, and therefore the high lithium storage capacity is obtained. The Ti3C2Tx prepared by adopting the strong base assisted mechanochemical method has the characteristics of simple and controllable process, small pollution, low cost and the like, and has the potential of realizinglarge-scale production.

Description

technical field [0001] The invention belongs to the technical field of MXene preparation and relates to a high lithium storage capacity Ti 3 C 2 T x The mechanochemical preparation method and its application as a negative electrode material for lithium-ion batteries. Background technique [0002] Lithium-ion batteries are widely used in various portable electronic devices, electric vehicles and other fields due to their high energy density, excellent cycle performance, high voltage, high safety, and environmental friendliness. In Li-ion batteries, the anode material plays a key role in battery performance. At present, graphitic carbon as a commercial negative electrode material has good cycle stability, but its theoretical capacity is low, which cannot meet the growing energy demand. Therefore, it is very important to develop new anode materials for lithium-ion batteries with excellent performance. [0003] MXene is a novel graphene-like two-dimensional transition metal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/921B82Y40/00H01M4/58H01M10/0525
CPCB82Y40/00C01P2002/72C01P2004/04C01P2004/20C01P2006/40C01B32/921H01M4/58H01M10/0525Y02E60/10
Inventor 曹敏花秦锦雯王洁王鑫
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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