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Composite electrode material, preparation method thereof and application of material

A composite electrode, mixed solution technology, applied in battery electrodes, nanotechnology for materials and surface science, circuits, etc., to achieve the effect of improving electrical conductivity and improving cycle stability

Pending Publication Date: 2018-05-15
RES INST OF XIAN JIAOTONG UNIV & SUZHOU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, so far, there is no large-scale, low-cost, and industrialized preparation technology in the research and development of electrodes for high-capacity, high-performance, long-life, and low-cost silicon-based lithium-ion rechargeable batteries.

Method used

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  • Composite electrode material, preparation method thereof and application of material
  • Composite electrode material, preparation method thereof and application of material
  • Composite electrode material, preparation method thereof and application of material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] Mix nano-silica powder (particle size: 50-100nm), carbon nanotubes, and polyvinylpyrrolidone in 100ml of water at a mass ratio of 100mg:100mg:100mg, then ultrasonically disperse for 30min with an ultrasonic breaker, and add 2g of sodium alginate to continue the mechanical process. After stirring for 2 hours, add 1.5 g of copper hydroxide and mechanically stir for 30 minutes, then add 3 g of gluconolactone, stir evenly, let stand for 24 hours, and then freeze-dry for 24 hours. The freeze-dried product was heated to 400° C. for carbonization in a tube furnace for 2 h, and nitrogen was used as a protective gas in the tube furnace. After the furnace was cooled down to room temperature, the silicon-carbon composite electrode material was obtained. figure 1 , figure 2 From the SEM image of its material, it can be seen from the figure that the freeze-dried material presents a three-dimensional grid shape, and the average layer thickness is 8-10 μm. image 3 It is the SEM pi...

Embodiment 2

[0065] Mix nano-silica powder (particle size 50-100nm), carbon nanotubes, and polyvinylpyrrolidone in 100ml of water according to the mass ratio of 200mg:100mg:100mg, then use an ultrasonic breaker to ultrasonically disperse for 30min, then add 2g of sodium alginate to continue After mechanical stirring for 2 hours, add 1.5g of copper hydroxide and mechanically stir for 30 minutes, then add 3g of gluconolactone, stir evenly, let stand for 24 hours, and then freeze-dry for 24 hours. The freeze-dried product was heated to 400° C. for carbonization in a tube furnace for 2 h, and nitrogen was used as a protective gas in the tube furnace. After the furnace was cooled down to room temperature, the silicon-carbon composite electrode material was obtained. Figure 6 --8 In order to obtain the SEM characterization results of the material, compared with Example 1, with the increase in the quality of nano-silicon powder, the three-dimensional grid-like structure does not change, and copp...

Embodiment 3

[0067] Mix nano-silica powder (particle size: 50-100nm), carbon nanotubes, and polyvinylpyrrolidone in 100ml of water according to the mass ratio of 100mg:200mg:200mg, then use an ultrasonic breaker to ultrasonically disperse for 30min, then add 2g of sodium alginate to continue After mechanical stirring for 2 hours, add 1.5g of copper hydroxide and mechanically stir for 30 minutes, then add 3g of gluconolactone, stir evenly, let stand for 24 hours, and then freeze-dry for 24 hours. The freeze-dried product was heated to 400° C. for carbonization in a tube furnace for 2 h, and nitrogen was used as a protective gas in the tube furnace. After the furnace was cooled down to room temperature, the silicon-carbon composite electrode material was obtained. Figure 9 --11 is the SEM characterization result of the obtained material. As the mass of carbon nanotubes increases, the three-dimensional grid-like structure of the composite electrode material becomes a honeycomb structure. The...

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Abstract

The invention provides a preparation method of a composite electrode material. The preparation method includes the steps: uniformly dispersing a carbon nanotube, silicon particles and water-soluble organic matters in water, adding sodium alga acid for crosslinking to form hydrogel and freeze-drying a crosslinked product; carbonizing the product in protective atmosphere at the temperature ranging from 350 DEG C to 600 DEG C to obtain the composite electrode material. The microstructure of the prepared composite electrode material is in the shape of a three-dimensional grid, and the silicon particles and the carbon nanotube are inlaid into a laminated structure. The invention further provides an application of the composite electrode material to preparation of a lithium ion battery. A skeleton structure of the sodium alga acid hydrogel serves as a template, the composite electrode material with good conductivity is prepared by a simple and efficient method, the shape of the composite electrode material can be adjusted, and the composite electrode material has good cycling stability.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a composite electrode material and its preparation method and application. Background technique [0002] Today's conventional energy is increasingly scarce, and it is imminent to develop secondary batteries with high specific energy. Among them, silicon anode has attracted great attention due to its high specific capacity. However, due to the large volume expansion (400%) during the charging and discharging process, this limits its application in practical production. [0003] At present, the main method to solve the problem of silicon anode failure is to provide expansion space for the expansion of silicon, but the existing technology is not only complicated and difficult to realize, but also easily pollutes the environment, making it difficult to realize large-scale industrial production. In addition, studies have found that when the silicon particle size reaches below 150nm...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/485H01M4/525H01M4/62H01M10/0525B82Y30/00
CPCH01M4/362H01M4/386H01M4/485H01M4/525H01M4/625H01M4/626H01M10/0525B82Y30/00Y02E60/10
Inventor 张慧连崑李维汉宗平
Owner RES INST OF XIAN JIAOTONG UNIV & SUZHOU
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