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Flexible MXene/Si composite material as well as preparation method and application thereof

A composite material and flexible technology, applied in the direction of structural parts, electrical components, battery electrodes, etc., can solve the problems of weak bonding force, silicon particle drop, etc., to improve conductivity, solve volume expansion, and make the electroplating process simple and easy Effect

Inactive Publication Date: 2020-06-16
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the binding force between silicon and MXene is weak, and the volume expansion generated during cycling will cause the silicon particles to drop

Method used

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  • Flexible MXene/Si composite material as well as preparation method and application thereof

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Embodiment approach

[0033] The third embodiment of the present invention provides an application of the above-mentioned flexible MXene / Si composite material in lithium ion batteries, lithium metal batteries and / or solar batteries.

[0034] The fourth embodiment of the present invention provides a lithium ion battery, the negative electrode material is the above-mentioned flexible MXene / Si composite material.

[0035] The fifth embodiment of the present invention provides a lithium metal battery, the current collector adopts the above-mentioned flexible MXene / Si composite material.

[0036] In order to enable those skilled in the art to understand the technical solution of the present invention more clearly, the technical solution of the present invention will be described in detail below in conjunction with specific embodiments.

Embodiment 1

[0038] A kind of preparation method of flexible MXene / Si composite material, comprises the steps: adopt three-electrode system, working electrode is Ti 3 C 2Self-supporting membrane, the reference electrode and the counter electrode are metal platinum sheets, the electroplating solution is 100mL ethylene glycol, 1.8g silicon tetrachloride and 0.2g tetrabutylammonium chloride, at 3mA cm -2 A layer of silicon can be obtained after electroplating at a current density of 10 minutes, and then vacuum dried for 10 hours to obtain a flexible Ti 3 C 2 / Si composite material. It is directly used as the negative electrode material of lithium-ion batteries. In the electrolyte of EC / DEC / lithium hexafluorophosphate, lithium foil is used as the counter electrode and reference electrode to assemble a button battery. The cyclic voltammetry curve is as follows: figure 1 shown.

Embodiment 2

[0040] A kind of preparation method of flexible MXene / Si composite material, comprises the steps: adopt three-electrode system, working electrode is V 2 C self-supporting film, the reference electrode and the counter electrode are metal platinum sheets, the electroplating solution is composed of 100mL propylene carbonate, 1.5g silicon bromide and 0.5g tetrabutylammonium bromide, at 2mA cm -2 A layer of silicon can be obtained after electroplating at a current density of 30 minutes, and then vacuum dried for 10 hours to obtain a flexible V 2 C / Si composite material.

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Abstract

The invention discloses a flexible MXene / Si composite material as well as a preparation method and application thereof. The preparation method comprises the steps of putting an MXene film into an electroplating solution for electro-deposition, and depositing a layer of silicon film on the surface of the MXene film. The electroplating solution is a mixed solution of a silicon source, a phase transfer catalyst and an organic solvent, wherein the silicon source is one or a mixture of two or more of silicon tetrachloride, hexamethyldisilane, cyclopentyl trichlorosilane, methoxytrimethylsilane, hexaphenyl disiloxane, hexaphenyl cyclotrisiloxane, tetrakis (trimethylsiloxy) silane, ethoxytriphenylsilane, triisopropylsilane, trimethylsilanol potassium, trichlorosilane, tetraethoxysilane and silicon bromide. The preparation method disclosed by the invention is simple and feasible. The production cost can be reduced, and the obtained MXene and silicon have relatively strong acting force.

Description

technical field [0001] The present invention relates to the field of new energy, and in particular to a flexible MXene / Si composite material and its preparation method and application. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] As one of the negative electrode materials of lithium-ion batteries, silicon has low working voltage (0.2V-0.3V), high theoretical specific capacity (3579mAh g -1 ) and are abundant. However, several problems limit its commercialization. The huge volume expansion (>400%) during the charge and discharge process pulverizes and breaks the silicon anode, which leads to poor contact between the current collector and the active material, accomp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/583H01M10/0525
CPCH01M4/366H01M4/38H01M4/386H01M4/583H01M4/625H01M10/0525Y02E60/10
Inventor 冯金奎田园安永灵
Owner SHANDONG UNIV
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