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A kind of carbon-pillared mxene composite material and its application

A technology of composite materials and carbon pillars, applied in hybrid capacitor electrodes, structural parts, electrical components, etc., can solve the problems of low application capacity, limit the application prospects of MXene, and the incomplete utilization of interlayer energy storage space, etc., to achieve multi-capacity , meet the requirements of use, and the effect of stable cycle performance

Active Publication Date: 2019-01-08
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although MXene materials have excellent electrical conductivity and excellent chemical stability, their application capacity in lithium-ion batteries is low (50-200mAh / g), which is significantly lower than that of commercial graphite materials (372mAh / g).
This largely limits the application prospects of MXenes in Li-ion batteries
In addition, although MXene materials have a high capacity (~360F / cm 3 ), but its potential interlayer energy storage space has not been fully utilized

Method used

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  • A kind of carbon-pillared mxene composite material and its application
  • A kind of carbon-pillared mxene composite material and its application
  • A kind of carbon-pillared mxene composite material and its application

Examples

Experimental program
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Effect test

Embodiment 1

[0021] Take 3g Ti 3 AlC 2 Put the powder (MAX) into a beaker, add 10ml of HF solution with a mass fraction of 40%, stir, and etch at room temperature for 16h. Then the etched Ti 3 C 2 The MXene powder was centrifuged, washed with deionization to PH = 6-7, and baked in a blast oven at 80°C for 12 hours. The dried 0.1g Ti 3 C 2 MXene powder, stirred in 40mL aqueous solution containing 0.05g / mL gelatin (Aladdin reagent, chemically pure) at 50°C for 5h, centrifuged, cleaned with deionization, dried, and then heated at a rate of 10°C / min in a nitrogen atmosphere Insulated at 500°C for 2h to obtain carbon pillared Ti 3 C 2 MXene material.

[0022] With the carbon pillar Ti made in embodiment 1 3 C 2 MXene material powders were prepared into electrodes as follows.

[0023] Weigh the carbon-pillared Ti with a mass ratio of 80:10:10 3 C 2 MXene material: super-P: PVDF, ground evenly to make electrode, metal lithium sheet as counter electrode, electrolyte is 1mol / L LiPF 6 ...

Embodiment 2

[0026] Take 2.5g Ti 2 Put AlC powder into a beaker, add 30ml of HF solution with a mass fraction of 40%, stir, and etch at room temperature for 8h. Then the etching powder is centrifuged out of Ti 2C MXene powder, washed with deionization to PH = 6-7, baked in a blast oven at 80°C for 12h. 0.2g dried Ti 2 C MXene powder, stirred in 50mL aqueous solution containing 0.5g / mL polydiallyldimethylammonium chloride (Aladdin reagent, Mw 100000-200000, 20wt.% aqueous solution, CP) at 60°C for 4h, centrifuged, and Deionized cleaning, drying, and holding at 500°C for 2 hours at a heating rate of 5°C / min in an argon atmosphere to obtain carbon pillared Ti 2 CMXene material. Using the prepared carbon pillars to support Ti 2 The C MXene material is made into an electrode according to the method of Example 1, and assembled into a molded lithium ion battery. The discharge capacity after 50 cycles at a current density of 100mA / g is close to 485mAh / g, compared to the Ti without pillar supp...

Embodiment 3

[0028] Take 2.8g Nb 2 Put AlC powder into a beaker, add 20ml of HF solution with a mass fraction of 35%, stir, and etch at room temperature for 18h. Then the etch powder is centrifuged out of Nb 2 C MXene powder, washed with deionization to PH = 6-7, baked in a blast oven at 80°C for 8h. 0.15g dried Nb 2 C MXene powder, stirred in 60mL solution containing 2g / mL chitosan (Aladdin reagent, medium viscosity, 200-400mPa.s) at 60°C for 8h, centrifuged, cleaned with deionization, dried, and then heated in argon atmosphere The carbon pillared Nb was obtained by heating at 600 °C for 2 h at a heating rate of 3 °C / min. 2 C MXene materials. Nb supported by as-prepared carbon pillars 2 The CMXene material is made into electrodes according to the method of Example 1, assembled into a simulated supercapacitor, and the discharge capacity after 3000 cycles at a current density of 10A / g is close to 275F / g, compared to the non-pillared Nb 2 The capacity of C MXene (~95F / g), the capacity ...

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Abstract

The invention provides a carbon-pillared MXene composite material and an application thereof. The carbon-pillared MXene composite material comprises a two-dimensional layered MXene carrier and a carbon nanosheet loaded between MXene layers; and a preparation method comprises the following steps of (1) processing a taken MAX raw material in an HF solution to obtain an MXene material; (2) soaking the MXene material obtained in the step (1) into a solution of which the cationic carbon precursor content is 0.005-20g / mL, stirring at 30-100 DEG C for 0.5-72 hours and centrifuging, washing and drying a product to obtain a pre-pillared MXene material; and (3) heating the pre-pillared MXene material in a protective atmosphere to 300-800 DEG C at the rate of 2-10 DEG C / min and carrying out insulating calcination treatment for 0.5-4 hours to obtain the carbon-pillared MXene material. The invention provides an application of the carbon-pillared MXene composite material as an electrode material of a lithium-ion battery or a super capacitor. The capacity of the electrode material can be greatly improved and the cycle performance is good, so that the operating requirements in the field of high energy and high power are met.

Description

(1) Technical field [0001] The invention relates to a carbon pillar-supported MXene composite material and its application as an electrode material of a lithium ion battery or a supercapacitor. (2) Background technology [0002] MXene materials are a new type of two-dimensional layered transition metal C / N compound materials. The two-dimensional MXene material has excellent electrical conductivity, chemical stability and other characteristics. So far, the preparation of MXene materials is mainly obtained by etching MAX raw materials with HF solution. So far, MXene has been applied in many fields, such as lithium-ion batteries, supercapacitors, photocatalysis, hydrogen storage and other fields. Although MXene materials have excellent electrical conductivity and excellent chemical stability, their application capacity in lithium-ion batteries is low (50-200mAh / g), which is significantly lower than that of commercial graphite materials (372mAh / g). This largely limits the app...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/583H01M4/587H01G11/24H01G11/26H01G11/30H01G11/36
CPCH01G11/24H01G11/26H01G11/30H01G11/36H01M4/366H01M4/583H01M4/587Y02E60/10Y02E60/13
Inventor 罗剑敏袁华栋陶新永夏阳梁初黄辉张俊甘永平张文魁
Owner ZHEJIANG UNIV OF TECH
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