Composite lithium metal negative electrode based on MXene aerogel and synthesis method thereof

A metal negative electrode and a synthesis method technology, which can be used in negative electrodes, electrode manufacturing, electrical components, etc., can solve the problems of low coulombic efficiency of lithium dendrites, and achieve the effects of avoiding lithium dendrites, suppressing stacking, and suppressing volume expansion.

Inactive Publication Date: 2019-11-08
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the shortcomings of the existing lithium metal anodes that are prone to lithium dendrites and low coulombic efficiency, the present invention provides a composite lithium metal anode based on MXene airgel and its synthesis method. The prepared MXene airgel is composed of two Dimensional MXene sheet cross-linked assembly

Method used

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  • Composite lithium metal negative electrode based on MXene aerogel and synthesis method thereof
  • Composite lithium metal negative electrode based on MXene aerogel and synthesis method thereof
  • Composite lithium metal negative electrode based on MXene aerogel and synthesis method thereof

Examples

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Embodiment 1

[0032] 1) Disperse MXene in water at normal temperature and pressure to prepare 10 mL of 5 mg mL -1 the dispersion liquid;

[0033] 2) Dissolve polyvinyl alcohol in water at 90°C to prepare 10mL of 5mg mL -1 polyvinyl alcohol solution;

[0034] 3) Slowly add the polyvinyl alcohol solution prepared in step 2) dropwise to the MXene dispersion prepared in step 1) under normal temperature and pressure conditions, and mix evenly; the mass fraction of MXene in the mixed solution is 50%.

[0035] 4) Put the mixed solution prepared in step 3) in an ultrasonic cleaning machine for ultrasonic treatment for 1 hour to make it completely gelled, and then freeze-dry it for 48 hours to obtain a three-dimensional MXene airgel; the obtained three-dimensional MXene The pore size distribution of the airgel is between 2-50 μm, and the diameter of the three-dimensional MXene airgel is 14 mm, and the thickness is 300 μm.

[0036] 5) Assemble a 2016 button cell in a glove box filled with argon, t...

Embodiment 2

[0039] 1) Disperse MXene in water at normal temperature and pressure to prepare 7mL with a concentration of 8mg mL -1 the dispersion liquid;

[0040] 2) Dissolve polyvinyl alcohol in water at 95°C to prepare 3 mL of 8 mg mL -1 polyvinyl alcohol solution;

[0041] 3) Slowly add the polyvinyl alcohol solution prepared in step 2) dropwise to the MXene dispersion prepared in step 1) under normal temperature and pressure conditions, and mix evenly; the mass fraction of MXene in the mixed solution is 70%.

[0042] 4) Place the mixed solution prepared in step 3) in an ultrasonic cleaner for ultrasonic treatment for 2 hours to make it completely gelled, and then freeze-dry it for 60 hours to obtain a three-dimensional MXene airgel; the obtained three-dimensional MXene airgel The pore size distribution of the gel is between 50-80 μm, and the three-dimensional MXene airgel has a diameter of 16 mm and a thickness of 500 μm.

[0043] 5) Assemble a 2016 button cell in a glove box filled...

Embodiment 3

[0046] 1) Disperse MXene in water at normal temperature and pressure to prepare 9 mL of 10 mg mL -1 the dispersion liquid;

[0047] 2) Dissolve polyvinyl alcohol in water at 100°C to prepare 1 mL of 10 mg mL -1 polyvinyl alcohol solution;

[0048] 3) Slowly add the polyvinyl alcohol solution prepared in step 2) dropwise to the MXene dispersion prepared in step 1) under normal temperature and pressure conditions, and mix evenly; the mass fraction of MXene in the mixed solution is 90%.

[0049] 4) Place the mixed solution prepared in step 3) in an ultrasonic cleaning machine for ultrasonic treatment for 3 hours to make it completely gelled, and then freeze-dry it for 72 hours to obtain a three-dimensional MXene airgel; the three-dimensional MXene airgel The pore size distribution of the gel is between 80-100 μm, and the diameter of the three-dimensional MXene airgel is 18 mm, and the thickness is 800 μm.

[0050] 5) Assemble a 2016 button cell in a glove box filled with argon...

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Abstract

The invention discloses a composite lithium metal negative electrode based on an MXene aerogel and a synthesis method thereof, which belong to the field of lithium batteries. The composite lithium metal negative electrode comprises metal lithium and the MXene aerogel, wherein the MXene aerogel is assembled by cross-linking of two-dimensional MXene sheets and has a three-dimensional hierarchical porous structure; the MXene aerogel pores are filled with the metal lithium; and the thickness of the MXene aerogel is 300 mum to 800 mum. According to the composite lithium metal negative electrode prepared in the invention, rich pro-lithium functional groups on the surface of the MXene aerogel can be specifically combined with the lithium ions, uniform nucleation of lithium is thus realized, formation of lithium dendrites is suppressed, and the coulombic efficiency, the safety and the cycle life of the lithium metal negative electrode are effectively improved.

Description

technical field [0001] The invention belongs to the field of lithium batteries, and relates to a composite lithium metal negative electrode based on MXene airgel and a synthesis method thereof. Background technique [0002] Since the advent of lithium-ion batteries in the 1990s, they have been widely used in smartphones, laptop computers, and electric vehicles. However, the theoretical specific capacity of graphite anode material is only 372mAh g -1 , which cannot meet the current demand for high energy density. Therefore, it is imperative to develop the next generation of lithium battery anode materials. [0003] Due to its extremely high theoretical specific capacity (3860mAh g -1 ), the lowest electrochemical potential (-3.04V) and the smaller density (0.534g cm -3 ), known as the "holy grail" of lithium battery anode materials. Lithium metal batteries using metallic lithium as the negative electrode, including lithium-sulfur batteries and lithium-air batteries, have...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/134H01M4/1395H01M4/04H01M4/36H01M4/38H01M4/62H01M10/052H01M10/0525
CPCH01M4/045H01M4/134H01M4/1395H01M4/366H01M4/382H01M4/628H01M10/052H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 孙渝峰王治宇邱介山
Owner DALIAN UNIV OF TECH
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