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Method for performing carbon coating modification on nano-powder by adopting water-soluble polymer

A technology of water-soluble polymers and nano-powders, which is applied in the direction of electrical components, battery electrodes, circuits, etc., to achieve the effects of low production cost, high yield, and enhanced performance advantages

Inactive Publication Date: 2013-04-10
山东天润丰新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The survey found that there is no research report on direct carbon coating of nanomaterials by using water-soluble polymers such as industrial modified starch

Method used

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  • Method for performing carbon coating modification on nano-powder by adopting water-soluble polymer
  • Method for performing carbon coating modification on nano-powder by adopting water-soluble polymer
  • Method for performing carbon coating modification on nano-powder by adopting water-soluble polymer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Weigh 2g of soluble starch, 0.5g of carboxymethyl starch, 1g of glucose, 0.5g of PVP and 60.08g of commercial nano-silicon dioxide, respectively, and add them to a mixed solution of 30mL of pure water and 10mL of ethanol in sequence, stir well and then filter with suction. Vacuum drying at 80°C for 5 hours to obtain the precursor powder. The precursor was annealed at 300°C for 3 hours in a 99% nitrogen atmosphere, and then annealed at 700°C for 6 hours to obtain silicon oxide nanopowder with good carbon coating. figure 1 Among them, a is the commercial silica raw material, and b is the carbon-coated silica obtained from the reaction.

Embodiment 2

[0032]Weigh cross-linked hydroxypropyl tapioca starch and glucose according to the mass ratio of 1:3, and mix them evenly. Take 1g, 2g, and 5g of the above mixture, mix them with 40g of commercial nano-titanium dioxide respectively, and stir them with 20mL of pure water respectively. Filter, vacuum dry at 80°C for 5 hours to obtain three precursor powders; anneal the precursor in 99% nitrogen atmosphere at 300°C for 3 hours, then anneal at 700°C for 6 hours, and finally obtain three carbon-coated nano-titanium dioxide in turn Powder. like figure 2 as shown, figure 2 a is a commercial nano-titanium dioxide raw material, figure 2 b. figure 2 c. figure 2 d is the carbon-coated nano-titanium dioxide obtained by adding 1 g, 2 g, and 5 g of the water-soluble polymer, respectively.

Embodiment 3

[0034] Weigh 1g of soluble starch, 2.5g of glucose, 0.2g of PVP and 39.5g of lithium ferrous phosphate, add them into a mixed solution composed of 15mL of water and 5mL of ethanol, stir them evenly, filter them with suction, and dry them under vacuum at 80°C for 5 hours to obtain the precursor The precursor was annealed at 300°C for 3 hours in a 99.9% nitrogen atmosphere, and then annealed at 600°C for 6 hours to obtain lithium iron phosphate nanopowder with good carbon coating. image 3 Lithium iron phosphate before carbon coating ( image 3 a) and carbon-coated lithium iron phosphate ( image 3 b) Raman test chart, it can be clearly seen image 3 There is a carbon component in b. By comparing the G peak and D peak, it can be seen that there is no graphite characteristic peak before carbon coating, and the degree of carbon graphitization in the product after carbon coating is relatively high, which is conducive to improving the conductivity of the material. Scanning electro...

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Abstract

The invention discloses a method for performing carbon coating modification on nano-powder by adopting a water-soluble polymer. The method comprises the following steps: weighing the water-soluble polymer (such as one or more of industrial modified starch, glucose and the like), surface active agent and the nano-powder according to the weight ratio of (0.1-10) : (0-5) : (80-100) as solid raw materials, preparing slurry with a dissolution and dispersion agent according to the solid-liquid ratio of (1-1000) g / 50mL, uniformly stirring and dispersing, then performing suction filtration (or centrifugation) and drying to get a precursor, and then annealing at the temperature of 300 DEG C-700 DEG C under a protective atmosphere to get the nano-powder with good carbon-coating property. According to the method disclosed by the invention, the surface uniform carbon coating can be effectively performed on nano-material, electron and ion migration ratio in the material can be accelerated, the agglomeration of the nano-material can be inhibited, the void ratio and the like of the material can be improved, and the performance advantages of the nano-material can be further enhanced.

Description

technical field [0001] The invention belongs to the field of nano powder materials, in particular to a method for improving carbon coating of nano powder. Background technique [0002] Since the mid-1980s, when people developed nano-metal materials, nano-materials began to develop rapidly, such as nano-semiconductor materials, nano-ceramic materials, nano-magnetic materials and nano-medical materials, and countries have paid more and more attention to the development of nano-materials. , Nanomaterials have become one of the emerging industries with the greatest market potential. Nanomaterials have been applied in a small range of industries, but the common problems of nanomaterials, such as easy agglomeration, surface amorphization, instability, etc., directly limit their large-scale production and application. For example, in new energy storage technologies represented by lithium-ion batteries and supercapacitors, electrode powders are gradually developing to nanometer siz...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/48
CPCY02E60/10
Inventor 杨立山丁轶杨振三
Owner 山东天润丰新能源科技有限公司
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