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Three-dimensional graphene composite material loaded with single-layer flower-shaped MXene nanosheets, preparation method and application thereof

A composite material and graphene technology, applied in the direction of graphene, nanocarbon, nanotechnology, etc., can solve problems such as hindering application, inability to disperse, and easy agglomeration

Active Publication Date: 2020-10-27
WUHAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the strong interaction of surface groups, MXene etched by strong acid still cannot be uniformly dispersed in the form of monolayer sheets, and it is easy to agglomerate, which reduces the specific surface area, which greatly hinders its application in lithium batteries. Applications

Method used

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  • Three-dimensional graphene composite material loaded with single-layer flower-shaped MXene nanosheets, preparation method and application thereof
  • Three-dimensional graphene composite material loaded with single-layer flower-shaped MXene nanosheets, preparation method and application thereof
  • Three-dimensional graphene composite material loaded with single-layer flower-shaped MXene nanosheets, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Load Ti 3 C 2 The three-dimensional graphene lithium-sulfur battery electrode material of nanosheet, it comprises the steps:

[0028] 1) Add 2g of Ti to the liner of 250mL reactor 3 AlC 2 (MAX), then add 20mL 40% HF solution and stir for 24h;

[0029] 2) The product of step 1) was centrifuged and washed to neutrality, then dispersed in 20 mL of 45% TMAOH solution and stirred for 24 h, then sonicated for 2 h under the protection of high-purity argon;

[0030] 3) The product of step 2) was washed with water, separated by centrifugation (2500rpm, 30min), and the separated product was treated with liquid nitrogen and directly transferred to a lyophilizer, and lyophilized at -40°C for 72h;

[0031] 4) The product of step 3) is spray-dried to obtain a single-layer flower-like Ti 3 C 2 (MXene) nanosheets;

[0032] 5) Add 2 mL of 1 mg mL graphene oxide dispersion into a 10 mL sample bottle, and stir ultrasonically for 10 min;

[0033] 6) Ti in step 4) 3 C 2 The nanosh...

Embodiment 2

[0046] Load Ti 2 The three-dimensional graphene lithium-sulfur battery electrode material of C nanosheet, it comprises the following steps:

[0047] 1) Add 2g of Ti to the liner of 250mL reactor 2 AlC(MAX), then add 20mL 40% HF solution and stir for 24h;

[0048] 2) The product of step 1) was centrifuged and washed to neutrality, then dispersed in 20 mL of 45% TMAOH solution and stirred for 24 h, then sonicated for 2 h under the protection of high-purity argon;

[0049] 3) The product of step 2) was washed with water, separated by centrifugation (2500rpm, 30min), and the separated product was treated with liquid nitrogen and directly transferred to a freeze dryer, and freeze-dried at -40°C for 72h;

[0050] 4) The product of step 3) is spray-dried to obtain a single-layer flower-like Ti 2 C(MXene) nanosheets;

[0051] 5) Add 2 mL of 1 mg mL graphene oxide dispersion into a 10 mL sample bottle, and stir ultrasonically for 10 min;

[0052] 6) Ti in step 4) 2 C nanosheets w...

Embodiment 3

[0060] Load Hf 3 C 2 The three-dimensional graphene lithium-sulfur battery electrode material of nanosheet, it comprises the steps:

[0061] 1) Add 2g of Hf into the 250mL reactor liner 3 AlC 2 (MAX), then add 20mL 40% HF solution and stir for 24h;

[0062] 2) The product of step 1) was centrifuged and washed to neutrality, then dispersed in 20 mL of 45% TMAOH solution and stirred for 24 h, then sonicated for 2 h under the protection of high-purity argon;

[0063] 3) The product of step 2) was washed with water, separated by centrifugation (2500rpm, 30min), and the separated product was treated with liquid nitrogen and directly transferred to a freeze dryer, and freeze-dried at -40°C for 72h;

[0064] 4) The product of step 3) is spray-dried to obtain a single-layer flower-like Hf 3 C 2 (MXene) nanosheets;

[0065] 5) Add 2 mL of 1 mg mL graphene oxide dispersion into a 10 mL sample bottle, and stir ultrasonically for 10 min;

[0066] 6) Hf in step 4) 3 C 2 The nanos...

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Abstract

The invention relates to a three-dimensional graphene composite material loaded with single-layer flower-shaped MXene nanosheets and a preparation method of the three-dimensional graphene composite material. The three-dimensional graphene composite material can be used as an electrode material of a lithium-sulfur battery. The preparation method comprises the following steps of: 1) putting a precursor MAX into an HF solution, and continuously performing stirring for uniform reaction until the reaction is complete; 2) centrifugally washing the obtained solution until the solution is neutral, andthen dispersing the solution into a TMAOH solution; 3) centrifugally washing the obtained solution, carrying out ultrasonic treatment under the protection of inert gas, carrying out low-temperature freezing treatment on a product, transferring the completely frozen product into a freeze dryer, and carrying out freeze drying; and 4) performing processing by a spray drying method to obtain a single-layer flower-like MXene nanosheet, blending the single-layer flower-like MXene nanosheet with graphene oxide, performing stirring and dispersing uniformly, finally adding a reducing agent, carrying out heating reaction to obtain the three-dimensional graphene composite material loaded with MXene, and carrying out freeze drying to obtain the MXene-loaded three-dimensional graphene composite material. When the material is used for modifying the positive electrode of a lithium-sulfur battery, excellent high load performance and cycling stability can be shown.

Description

technical field [0001] The invention relates to the design of electrode materials for lithium-sulfur batteries, in particular to a three-dimensional graphene composite material loaded with single-layer flower-shaped MXene nanosheets and a preparation method thereof, which can be used as electrode materials for lithium-sulfur batteries. Background technique [0002] Currently limited by the theoretical capacity of positive and negative electrode materials, the energy density of traditional lithium-ion batteries can no longer meet the growing requirements for high-energy-density energy storage devices such as electric vehicles. Due to its very high theoretical capacity (1675mAh / g) and energy density (2600Wh / Kg), lithium-sulfur batteries are considered to be one of the important development directions of next-generation electrochemical energy storage devices. However, the development and future commercial application of lithium-sulfur batteries are still limited by many factors...

Claims

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Application Information

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IPC IPC(8): C01B32/921C01B32/914C01B32/184H01M4/36H01M4/62H01M10/052B82Y30/00
CPCC01B32/921C01B32/914C01B32/184H01M4/362H01M4/624H01M4/625H01M4/628H01M10/052B82Y30/00C01P2004/01C01P2004/03C01P2006/40C01P2002/80C01P2002/85C01B2204/22C01P2004/20Y02E60/10
Inventor 赵焱储炜廖小彬
Owner WUHAN UNIV OF TECH
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