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Electrode material with ultrafine MoO2 nano-particles uniformly bridged inside flaky carbon matrix, as well as preparation method and application of electrode material

A nanoparticle and electrode material technology, applied in the field of nanomaterials and electrochemistry, can solve the problems of unsatisfactory cycle performance and life, poor dynamic volume expansion of lithium deintercalation, and achieve excellent electron/ion conductivity and structural stability. , reduce volume expansion, improve the effect of conduction

Pending Publication Date: 2020-10-09
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, two key issues with this electrode material are that during charge and discharge, MoO 2 The intermediate products of nanoparticle conversion reactions usually have poor lithium-deintercalation kinetics and severe volume expansion, resulting in unsatisfactory cycle performance and lifetime.
In recent years, it has become a research hotspot to obtain smaller volume expansion and fast ion / electron transport speed of composite carbon matrix by constructing exquisite nanostructures to improve its electrochemical performance. To construct a uniform carbon composite structure, the ultrafine MoO 2 Nanoparticles are evenly bridged inside the sheet-like carbon matrix, and electrode materials that maintain high capacity and cycle life of more than 1000 cycles have not been reported yet.

Method used

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  • Electrode material with ultrafine MoO2 nano-particles uniformly bridged inside flaky carbon matrix, as well as preparation method and application of electrode material
  • Electrode material with ultrafine MoO2 nano-particles uniformly bridged inside flaky carbon matrix, as well as preparation method and application of electrode material
  • Electrode material with ultrafine MoO2 nano-particles uniformly bridged inside flaky carbon matrix, as well as preparation method and application of electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The preparation method of the electrode material uniformly bridged with ultrafine MoO2 nanoparticles inside the sheet-like carbon matrix comprises the following steps:

[0031] 1) Mix 0.96g Mo powder and add 20mL H 2 o 2 and 20mL H 2 O mixed solution, stirred for 12h;

[0032] 2) Transfer the solution obtained in step 1) into a 100mL reactor and heat at 180°C for 24h, take out the reactor, and cool to room temperature naturally to obtain MoO 3 Nanobelt solution;

[0033]3) Add 2 mL of the product obtained in step 2) and 0.3 g of dopamine hydrochloride to a solution of 0.1214 g of tris-hydroxymethylaminomethane dissolved in 100 mL of deionized water, stir for 4 hours, and wash with deionized water and absolute ethanol three times respectively , dried in an oven at 80°C to obtain a flower-like Mo-polydopamine composite (Mo-PDA);

[0034] 4) The product obtained in step 3) is placed in a tube furnace and sintered at 800°C for 2 hours in an Ar atmosphere to obtain unif...

Embodiment 2

[0040] 1) Mix 1.5g Mo powder and add 30mL H 2 o 2 and 30mL H 2 In the mixed solution of O, stir for 18h;

[0041] 2) Transfer the solution obtained in step 1) into a 100mL reactor and heat at 200°C for 24h, take out the reactor, and cool to room temperature naturally to obtain MoO 3 Nanobelt solution;

[0042] 3) Add 2 mL of the product obtained in step 2) and 0.6 g of dopamine hydrochloride to a solution of 100 mL of deionized water dissolved in 0.2 g of trishydroxymethylaminomethane, stir for 4 hours, and wash with deionized water and absolute ethanol three times respectively , dried in an oven at 80°C to obtain a flower-like Mo-polydopamine composite (Mo-PDA);

[0043] 4) The product obtained in step 3) is placed in a tube furnace and sintered at 800°C for 4 hours in an Ar atmosphere to obtain uniformly bridged ultrafine MoO inside the sheet-like carbon matrix 2 Nanoparticle electrode materials.

[0044] The sheet-like carbon matrix obtained in this experimental examp...

Embodiment 3

[0046] 1) Mix 0.5g Mo powder and add 20mL H 2 o 2 and 20mL H 2 O mixed solution, stirred for 6h;

[0047] 2) Transfer the solution obtained in step 1) into a 100mL reactor and heat at 170°C for 12h, take out the reactor, and cool to room temperature naturally to obtain MoO 3 Nanobelt solution;

[0048] 3) Add 2 mL of the product obtained in step 2) and 0.2 g of dopamine hydrochloride to a solution of 0.1214 g of tris-hydroxymethylaminomethane dissolved in 100 mL of deionized water, stir for 4 hours, and wash with deionized water and absolute ethanol four times respectively , and dry;

[0049] 4) The product obtained in step 3) is placed in a tube furnace and sintered at 700° C. for 4 hours in an Ar atmosphere to obtain an electrode material uniformly bridged with ultrafine MoO2 nanoparticles inside the sheet-like carbon matrix.

[0050] The sheet-like carbon matrix obtained in this experimental example is uniformly bridged with ultra-fine MoO 2 Taking the electrode mater...

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Abstract

The invention relates to the technical field of nano materials and electrochemistry and relates to an electrode material with ultrafine MoO2 nano-particles uniformly bridged inside a flaky carbon matrix and a preparation method of the electrode material. The material can be used as a lithium ion battery negative electrode active material with high capacity and long cycle life; a three-dimensionalflower-shaped structure formed by stacking and interweaving flaky carbon matrix substructures, the thickness of the sheet layer of the carbon matrix is 10-20 nm; the diameter of a single flower-shapedstructure formed by the carbon substrate is 2-6 microns; and the diameter of MoO2 nano-particles is 1-3 nm. The nanometer material can be used as a lithium ion battery negative electrode material. The material disclosed by the invention has the characteristics of simple process, mild reaction conditions and excellent electrochemical performance.

Description

technical field [0001] The invention relates to the technical field of nanomaterials and electrochemistry, in particular to an ultrafine MoO uniformly bridged inside a flaky carbon matrix 2 Nano particle electrode material and preparation method thereof, the material can be used as negative active material of lithium ion battery with high capacity and long cycle life. Background technique [0002] Energy shortage and environmental pollution have become two major problems facing the world today. The development and utilization of green and clean energy is of great significance to alleviating energy shortage and reducing environmental pollution. At present, lithium-ion batteries, as one of the representatives of clean energy storage systems, are widely used in portable electronic devices, automotive power batteries, and large-scale energy storage. However, the current commercialized graphite anode has a low specific capacity (372mAh g -1 ), poor security, and difficult to m...

Claims

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Application Information

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IPC IPC(8): C01G39/02C01B32/05H01M4/485H01M4/62H01M10/0525H01M4/04B82Y30/00B82Y40/00
CPCC01G39/02C01B32/05H01M4/485H01M4/625H01M4/628H01M10/0525H01M4/049B82Y30/00B82Y40/00H01M2004/027H01M2220/10H01M2220/20H01M2220/30C01P2004/80C01P2004/30C01P2002/72C01P2004/03C01P2004/04C01P2006/40C01P2004/17Y02E60/10
Inventor 麦立强余若瀚陈子昂周亮
Owner WUHAN UNIV OF TECH
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