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A three-dimensional porous nano-network structure MOS immobilized by ultra-small particles 2 Composite powder and its preparation method and application

A three-dimensional porous, network structure technology, applied in nanotechnology, structural parts, nanotechnology and other directions, can solve the problems of reducing electrochemical performance, affecting electronic/ionic conductivity, etc., to improve electrochemical performance, uniform morphology, The effect of uniform particle size

Active Publication Date: 2021-04-30
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as an electrode material for Na-ion batteries, MoS 2 The lattice parameters change during the Na ion deintercalation process, making MoS with high surface energy 2 The collapse and accumulation of the sheet structure affects the electron / ion conductivity between the sheets of S-Mo-S and reduces its electrochemical performance.

Method used

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  • A three-dimensional porous nano-network structure MOS immobilized by ultra-small particles <sub>2</sub> Composite powder and its preparation method and application
  • A three-dimensional porous nano-network structure MOS immobilized by ultra-small particles <sub>2</sub> Composite powder and its preparation method and application
  • A three-dimensional porous nano-network structure MOS immobilized by ultra-small particles <sub>2</sub> Composite powder and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A three-dimensional porous nano-network structure MoS immobilized by ultra-small particles 2 The preparation method of composite powder comprises the following steps:

[0041] 1) put H 2 o 2 Make 100ml solution A with NMP solution at a volume ratio of 1:0.5;

[0042] 2) Disperse 80mg of pure molybdenum disulfide nanosheets into 100ml of solution A, and stir at 35°C for 8h to obtain mixture B;

[0043] 3) The mixture B was centrifuged at 5000rpm for 50 minutes, and the supernatant was collected as solution C, that is, the mixture evenly dispersed in H 2 o 2 and ultra-small MoS in mixed solution of NMP 2 ;

[0044] 4) Dissolve 1.5 g of thiourea in 100 ml of deionized water to obtain solution D. Add 0.5 g MoO with stirring 3 into solution D, MoO 3 Distribute evenly in it; finally, slowly add 2ml of solution C to it, and finally obtain precursor E by heating while stirring;

[0045] 5) Put the precursor E in a magnetic boat and put it into a horizontal tube furnac...

Embodiment 2

[0049] A three-dimensional porous nano-network structure MoS immobilized by ultra-small particles 2 The preparation method of composite powder comprises the following steps:

[0050] 1) put H 2 o 2 Make 100ml solution A with NMP solution at a volume ratio of 1:0.8;

[0051] 2) Disperse 90mg of pure molybdenum disulfide nanosheets into 100ml of solution A, and stir at 40°C for 9h to obtain mixture B;

[0052] 3) The mixture B was centrifuged at 6000rpm for 45 minutes, and the supernatant was collected as solution C, that is, the solution evenly dispersed in H 2 o 2 and ultra-small MoS in mixed solution of NMP 2 ;

[0053] 4) Dissolve 1.8g of thiourea in 100ml of deionized water to obtain solution D; add 0.75g of MoO under stirring 3 into solution D, MoO 3 Evenly distributed in it; finally, slowly add 3ml of solution C to it, and finally obtain precursor E by heating while stirring;

[0054] 5) Put the precursor E in a magnetic boat and put it into a horizontal tube fur...

Embodiment 3

[0058] A three-dimensional porous nano-network structure MoS immobilized by ultra-small particles 2 The preparation method of composite powder comprises the following steps:

[0059] 1) put H 2 o 2 Make 100ml solution A with NMP solution at a volume ratio of 1:1.2;

[0060] 2) Disperse 100mg of pure molybdenum disulfide nanosheets into 100ml of solution A, and stir at 45°C for 10h to obtain mixture B;

[0061] 3) The mixture B was centrifuged at 6000rpm for 40 minutes, and the supernatant was collected as solution C, that is, the mixture evenly dispersed in H 2 o 2 and ultra-small MoS in mixed solution of NMP 2 ;

[0062] 4) Dissolve 2.0 g of thiourea in 100 ml of deionized water to obtain solution D; add 1.0 g of MoO under stirring 3 into solution D, MoO 3 Evenly distributed in it; finally, slowly add 4ml of solution C to it, and finally obtain precursor E by heating while stirring;

[0063] 5) Put the precursor E in a magnetic boat and put it into a horizontal tube ...

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Abstract

A three-dimensional porous nano-network structure MoS with ultra-small particles immobilized by the present invention 2 The composite powder and its preparation method and application belong to the technical field of sodium ion battery electrode material preparation. The pure phase MoS2 nanosheets were uniformly dispersed in H 2 o 2 and NMP solution, ultra-small MoS was obtained after stirring and centrifugation 2 particles, and then the prepared ultra-small MoS 2 The particles are wrapped in the three-dimensional molybdenum disulfide nano-network structure, which plays a role in fixing its structure and effectively relieves the MoS 2 Lattice parameters change during sodium ion deintercalation, MoS 2 The problem of collapse, accumulation and agglomeration of the lamellar structure, the final ultra-small particles immobilized three-dimensional porous nano-network MoS 2 Composite powder. The preparation method of the invention is simple, the reaction temperature is controllable, the reaction cycle is short, the process equipment is simple, and it is suitable for large-scale production. MoS prepared by the present invention 2 The structural composite powder can be used as the negative electrode material of the sodium ion secondary battery.

Description

technical field [0001] The invention belongs to the technical field of preparation of electrode materials for sodium ion batteries, and in particular relates to a three-dimensional porous nano-network structure MoS with ultra-small particles fixed 2 Composite powder and its preparation method and application. Background technique [0002] The rapid development of the new energy automobile industry has greatly stimulated the demand for electrode materials with high cycle performance and stable performance. Lithium-ion batteries have the characteristics of high voltage and high specific energy, and have made great progress in portable power applications. However, according to relevant statistics, the demand for lithium carbonate in 2017 was 247,000 tons, and the output was 227,300 tons. The supply pattern of lithium resources is constantly changing. Tightening, leading to prices soaring. Lithium reserves are limited and unevenly distributed, which will restrict the large-sca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58H01M10/054B82Y30/00
CPCB82Y30/00H01M4/5815H01M10/054H01M2004/021Y02E60/10
Inventor 许占位王天关伟伟赵怡星黄剑锋曹丽云孔硌杨思哲
Owner SHAANXI UNIV OF SCI & TECH
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