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Preparation method and application of carbon tin nanometer composite powder

A nanocomposite powder, tin powder technology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc. low rate and other problems, to achieve the effects of good cycle stability, low cost, and high reversible lithium storage capacity

Inactive Publication Date: 2012-08-01
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method can effectively improve the efficiency of ball milling, maintain the lamellar integrity of graphite, and improve the first reversible capacity and cycle life. Carbon has limited binding power

Method used

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  • Preparation method and application of carbon tin nanometer composite powder
  • Preparation method and application of carbon tin nanometer composite powder
  • Preparation method and application of carbon tin nanometer composite powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Press 80g of tin micron powder into a bulk target material, place this in an automatically controlled DC arc hydrogen plasma device as an anode, and a carbon rod as a cathode, feed a mixed gas of methane and argon at a ratio of 1:0.5, and evaporate Fast body target material, through condensation, passivation and other process steps to obtain carbon-coated tin nanocomposite powder materials.

[0021] According to the mass ratio, the above-mentioned 80% carbon-tin nanocomposite powder, 10% carbon black and 10% polytetrafluoroethylene binder are uniformly mixed to make electrode sheets, and 1mol / L LiPF 6 The solution electrolyte, and metal lithium sheets were assembled into a button battery in a glove box. At a current density of 0.2mA / cm 2 And the voltage is tested within the range of 2 ~ 0.01V. The first reversible specific capacity of the carbon-tin nanocomposite powder was measured to be 560mAh / g.

Embodiment 2

[0023] The implementation steps are basically the same as in Example 1, except that the ratio of methane and argon in the mixed atmosphere is 1:1; the obtained carbon-coated tin nanocomposite powder is made into an electrode sheet and tested, and the first reversible ratio The capacity is 310mAh / g.

Embodiment 3

[0025] The implementation steps are basically the same as in Example 1, except that the ratio of methane and argon in the mixed atmosphere is 1:2; the obtained carbon-coated tin nanocomposite powder is made into an electrode sheet and tested, and the first reversible ratio The capacity is 620mAh / g.

[0026] Embodiment three obtains the XRD pattern of carbon-coated tin nanocomposite powder figure 1 shown. The figure shows that the main phase of the composite is metallic tin.

[0027] Example 3 Obtaining the TEM image of carbon-coated tin nanocomposite powder figure 2 shown. The figure shows the microstructure of the composite material as carbon nanotubes partially filled with metallic tin.

[0028] Example 3 Obtaining the TEM image of carbon-coated tin nanocomposite powder image 3 shown. The figure shows that the carbon nanotubes in the composite material are multi-walled carbon nanotubes.

[0029] Embodiment three obtains carbon-coated tin nano-composite powder, and t...

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Abstract

The invention provides a preparation method of carbon tin nanometer composite powder of a negative electrode material of a lithium ion battery, and belongs to the field of preparation technologies and the application of nanometer materials. The technical solution scheme of the preparation method is that by utilizing automatic control direct current arc plasma equipment, block-shaped metallic tin or micron-size tin powder is pressed into a block to serve as an anode; a graphite rod is used as a cathode; a certain proportion of carbon-containing gas, active gas and inert gas are introduced a reaction chamber; and after a block-shaped target material is evaporated, carbon-coated tin nanometer composite particles are obtained. The powder material is used as an active substance to manufacture a negative electrode of the lithium ion battery, and the first reversible specific capacity of the powder material can reach 620mAh / g. The preparation method has the advantages that the carbon-coated tin nanometer particles synthesized in situ are provided with structures of multi-wall carbon nanometer tubes partially filled with the metallic tin, and the material used as the negative electrode material of the lithium ion battery has high intercalation / deintercalation lithium capacity density and high cycle stability; and besides, the costs of raw materials are low, the process is simple and large scale preparation can be conducted, so that the preparation method satisfies the requirements of industrial production.

Description

technical field [0001] The invention belongs to the field of nano material preparation technology and lithium ion battery application, relates to a preparation method of carbon-tin nano composite material, and relates to the application in lithium ion battery negative electrode materials. Background technique [0002] Lithium-ion batteries are currently recognized as ideal chemical power sources in the world. They have the advantages of small size, large capacity, and high voltage. They are widely used in communication equipment, electronic products, vehicles and other fields. At present, most commercial lithium-ion battery anode materials use graphite system, and the combination of graphite and lithium ions can form LiC 6 , its theoretical energy density is 372mAh / g. Simply improving the process cannot meet the increasing demand for energy density, so finding anode materials with higher lithium storage capacity has become a hot spot in the research of anode materials for l...

Claims

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Application Information

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IPC IPC(8): H01M4/04H01M4/1395H01M4/1393B82Y30/00
CPCY02E60/122Y02E60/10
Inventor 董星龙刘春静黄昊薛方红全燮
Owner DALIAN UNIV OF TECH
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