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Preparation and application methods of nanometer carbon sphere-supported MXene composite material

A technology of nano-carbon spheres and composite materials, which is applied in the direction of nano-carbon, electrical components, electrochemical generators, etc., to achieve the effects of simple process methods, solving stacking and agglomeration, and increasing ion transmission channels

Inactive Publication Date: 2019-03-08
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The work of the prior art research is mainly based on the in situ growth of TiO in 2D flake MXene 2 Nanocomposite materials [ZL201710324865.7], the performance of magnesium batteries using APC+LiCl as the electrolyte, there are few studies on the magnesium storage performance of using APC as the electrolyte and using MXene supported by nano-carbon spheres as the cathode material of magnesium batteries

Method used

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  • Preparation and application methods of nanometer carbon sphere-supported MXene composite material
  • Preparation and application methods of nanometer carbon sphere-supported MXene composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] MXene Ti supported by carbon nanospheres 3 C 2 The preparation of composite material comprises the following steps:

[0022] (1) 1g Ti with a particle size of 500 mesh 3 AlC 2 The powder is submerged in 20mL of 6mol / L mixed solution of sodium fluoride and hydrochloric acid, stirred at 60°C for 24h, cooled to room temperature, then poured into a centrifuge tube and centrifuged several times with deionized water until the solution in the centrifuge tube It was neutral, and the upper layer solution was precipitated. The sample left at the bottom of the centrifuge tube was dried in a vacuum oven at 80°C for 12 hours to obtain a two-dimensional crystal compound MXene Ti 3 C 2 ,From figure 1 It can be clearly seen that after being etched by the mixed solution of sodium fluoride and hydrochloric acid, it presents a lamellar shape with an obvious lamellar structure and a thickness of about 50nm.

[0023] (2) Mix and dissolve a certain amount of glucose and deionized water...

Embodiment 2

[0029] MXene Ti supported by carbon nanospheres 2 The preparation of C composite material and its magnesium battery performance comprise the following steps:

[0030] 1g Ti with a particle size of 500 mesh 2 Submerge the AlC powder in 20mL of 6mol / L mixed solution of sodium fluoride and hydrochloric acid, stir at 40°C for 48h, cool to room temperature, pour it into a centrifuge tube and wash it by centrifugation until the solution is neutral, and the upper layer solution is precipitated, leaving the bottom of the centrifuge tube The sample below was dried in a vacuum oven at 80°C for 12 hours to obtain a two-dimensional crystal compound Ti 2 C powder. The preparation of carbon nanospheres is as described in Example 1. Ti 2 C powder is made nanometer carbon sphere supports MXene Ti according to the method for embodiment 1 2 C composite material, made into electrode, assembled into a magnesium ion battery, the discharge capacity after 400 cycles at a current density of 50mA...

Embodiment 3

[0032] MXene V supported by carbon nanospheres 2 The preparation of C composite material and its magnesium battery performance comprise the following steps:

[0033] The particle size is 500 mesh 1g V 2 Submerge the AlC powder in 20mL of 6mol / L mixed solution of sodium fluoride and hydrochloric acid, stir at 90°C for 72h, cool to room temperature, pour it into a centrifuge tube and wash it by centrifugation until the solution is neutral, and the upper layer solution is precipitated, leaving the bottom of the centrifuge tube The sample below was placed in a vacuum drying oven at 80°C for 12 hours to obtain a two-dimensional crystal compound V 2 C powder. The preparation of carbon nanospheres is as described in Example 1. With the prepared V 2 C powder is made into nano-carbon spheres to support MXene V according to the method of Example 1 2 C composite material, made into electrode, assembled into a magnesium ion battery, the discharge capacity after 200 cycles at a curren...

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Abstract

The invention discloses preparation and application methods of a nanometer carbon sphere-supported MXene composite material. The preparation method comprises the steps of etching MAX-phase ceramic powder to obtain two-dimensional carbide MXene by a mixed solution of sodium fluoride and hydrochloric acid; synthesizing a nanometer carbon sphere by a hydrothermal method; and preparing a mixed solution from the MXene, a cationic surface active agent and the nanometer carbon sphere by electrostatic interaction, and performing stirring, centrifuging and drying under a room temperature, thereby obtaining the nanometer carbon sphere-supported MXene composite material powder. The preparation method is simple and safe and is low in cost. The nanometer carbon sphere-supported MXene composite materialis used as a magnesium battery positive electrode material, the interlayer distance of the MXene can be expanded, more surface active sites are exposed, ion transmission passages are increased, meanwhile, the problem of stack and agglomeration of an MXene piece layer during the circulation process is also solved, the magnesium storage capacity of the MXene is further substantially improved, the nanometer carbon sphere-supported MXene composite material has favorable cycle stability and is an excellent magnesium battery positive electrode material.

Description

technical field [0001] The invention belongs to the field of new energy storage, and in particular relates to the preparation of a nano-carbon sphere-supported MXene composite material and its application method in a magnesium battery. Background technique [0002] As one of the most promising new systems to replace traditional lithium-ion batteries in the future, magnesium secondary batteries have the advantages of high specific capacity, high energy density, abundant resources, good safety and no pollution, but their research is still in its infancy. . Compared with lithium ions, the higher charge density and stronger solvation of magnesium divalent ions limit their reversible deintercalation in cathode materials, resulting in low magnesium storage capacity and poor cycle performance of the materials. Therefore, finding a suitable cathode material is one of the key issues in the research of magnesium-ion batteries. [0003] So far, the cathode materials used in magnesium...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/583H01M4/62H01M10/054C01B32/15
CPCC01B32/15H01M4/362H01M4/583H01M4/625H01M10/054Y02E60/10
Inventor 范丽珍刘凡凡
Owner UNIV OF SCI & TECH BEIJING
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