High-performance three-dimensional carbon nanotube composite negative electrode material, preparation method therefor and application thereof

A carbon nanotube composite and negative electrode material technology, applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problem that the volume effect of high-capacity active materials cannot be effectively improved, and the active materials are not uniform Dispersion, low charge transfer efficiency and other issues, to achieve the effect of good industrialization prospects, improved cycle performance, and convenient industrial production

Active Publication Date: 2016-03-09
新疆护翼新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the ordinary mixing method, due to the limited electrostatic attraction between the two sides of the composite material, the active material cannot be uniformly dispersed in the space network structure of the carbon nanotube, so that the carbon nanotube cannot effectively improve the volume effect of the high-capacity active material; 2) carbon Ineffective contact between nanotubes and high-capacity active materials, resulting in low charge transfer efficiency

Method used

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  • High-performance three-dimensional carbon nanotube composite negative electrode material, preparation method therefor and application thereof
  • High-performance three-dimensional carbon nanotube composite negative electrode material, preparation method therefor and application thereof
  • High-performance three-dimensional carbon nanotube composite negative electrode material, preparation method therefor and application thereof

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Experimental program
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Effect test

Embodiment 1

[0035] 1) Prepare two 200mL aqueous solutions containing 1wt.%PDDA and 0.2M NaCl, and disperse them uniformly by ultrasonic dispersion for 10 minutes; The surface oxidized Si powder (particle size 100-200nm) was sequentially modified by PDDA-PSS-PDDA, filtered, vacuum-dried at 70°C for 2 hours, ground after drying, and stored with labels;

[0036] 2) Take 0.1g of the above-mentioned modified Si powder and redisperse it in 200mL deionized water, and disperse it ultrasonically for 2 hours to make it evenly dispersed;

[0037] 3) Add 0.02g of carboxylated carbon nanotubes into 200mL of deionized water, and ultrasonically disperse for 2 hours to uniformly disperse the carboxylated carbon nanotubes;

[0038] 4) In the case of high-speed stirring, take the above-mentioned modified Si powder solution and pour it into the dispersion of carboxylated carbon nanotubes, continue to stir for 2 hours and then let it stand, use a separatory funnel to take out the carboxylated carbon nanotube...

Embodiment 2

[0041] 1) Prepare two 200mL aqueous solutions containing 1wt.%PDDA and 0.2M NaCl, and disperse them uniformly by ultrasonic dispersion for 10 minutes; Sintered SnO 2 Nanoparticles (50nm) were sequentially modified by PDDA-PSS-PDDA, filtered, and vacuum-dried at 70°C for 2h. Grind after drying, mark and store;

[0042] 2) Take the above modified SnO 2 Re-disperse 0.2g of nanoparticles in 200mL of deionized water, and ultrasonically disperse for 2 hours to make them uniformly dispersed;

[0043] 3) Add 0.02g of carboxylated carbon nanotubes into 200mL of deionized water, and ultrasonically disperse for 2 hours to uniformly disperse the carboxylated carbon nanotubes;

[0044] 4) In the case of high-speed stirring, take the above modified SnO 2 Pour the nanoparticle solution into the dispersion of carboxylated carbon nanotubes, continue to stir for 2 hours and then let it stand, use a separatory funnel to take out the carboxylated carbon nanotubes / active substance suspension i...

Embodiment 3

[0047] 1) Prepare two 200mL aqueous solutions containing 1wt.%PDDA and 0.2M NaCl, and disperse them uniformly by ultrasonic dispersion for 10 minutes; Sintered ZnFe 2 o 4 Nanoparticles (about 50nm) were sequentially modified by PDDA-PSS-PDDA treatment, filtered, and vacuum-dried at 70°C for 2h. Grind after drying, mark and store;

[0048] 2) Take the above modified 0.1gZnFe 2 o 4 Nanoparticles were redispersed in 200mL deionized water, and ultrasonically dispersed for 2 hours to make them uniformly dispersed;

[0049] 3) Add 0.01g of carboxylated carbon nanotubes into 200mL of deionized water, and ultrasonically disperse for 2 hours to uniformly disperse the carboxylated carbon nanotubes;

[0050] 4) In the case of high-speed stirring, take the above-mentioned modified 0.1gZnFe 2 o 4 Pour the nanoparticle solution into the dispersion of carbon nanotubes, continue to stir for 2 hours, then let it stand still, use a separatory funnel to take out the carbon nanotube / active...

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Abstract

The invention discloses a preparation method for a high-performance three-dimensional carbon nanotube composite negative electrode material. The preparation method comprises: by taking a carboxylated carbon nanotube as a three-dimensional network framework and taking a high-capacity material subjected to layer by layer self-assembly and modification as an active substance, uniformly mixing the carbon nanotube with the active substance under the action of electrostatic attraction; and then performing in-situ coating by taking a mixed element-containing N or S-doped carbon source as a three-dimensional coating layer, and performing high-temperature treatment to obtain the high-performance three-dimensional carbon nanotube composite negative electrode material. The invention furthermore discloses the high-performance three-dimensional carbon nanotube composite negative electrode material and an application thereof. According to the preparation method, the cycle performance of the active substance is remarkably improved, and the capacity of the composite material can be controllably adjusted by controlling a ratio of the carbon nanotube to the active substance. In addition, a solvent used in the method is water, so that the method is environmentally-friendly, good in repeatability and low in cost, and has relatively high potential of large-scale application and good industrialized prospects.

Description

technical field [0001] The invention relates to the technical field of negative electrode materials for lithium ion batteries, in particular to a high-performance three-dimensional carbon nanotube composite negative electrode material and its preparation method and application. Background technique [0002] Lithium-ion batteries have the advantages of high open-circuit voltage, high energy density, long service life, no memory effect, less pollution, and low self-discharge rate. Its overall performance is superior to other traditional secondary batteries, and it is unanimously considered as a variety of portable batteries. The most ideal power supply for electronic equipment and electric vehicles. Although graphite, the negative electrode material of traditional lithium-ion batteries, has good cycle stability and high cost performance, due to its low charge-discharge specific capacity and no advantage in volume specific capacity, it is difficult to meet the high requirements...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M4/48H01M4/52H01M4/62H01M10/0525B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/386H01M4/48H01M4/523H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 岳鹿张文惠张志强陈晓宇
Owner 新疆护翼新材料科技有限公司
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