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Carbon-coated nano-antimony composite material as well as preparation method and application thereof

A technology of composite materials and carbon coating, which is applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of reduced uniformity of materials, difficulty in synthesis and control of carbon coating uniformity, and achieves The effect of low equipment requirements, low price, and wide range of sources

Active Publication Date: 2014-12-10
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this carbon-coated antimony composite material uses roasted carbon as the coated carbon source, and reduction and carbon coating are carried out during the roasting process, which makes it difficult to control the particle size and carbon coating uniformity, and it is easy to cause material Reduced uniformity

Method used

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  • Carbon-coated nano-antimony composite material as well as preparation method and application thereof
  • Carbon-coated nano-antimony composite material as well as preparation method and application thereof
  • Carbon-coated nano-antimony composite material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] The specific process of preparing carbon-coated nano-antimony composite material in this embodiment is as follows:

[0041] The chitosan water-soluble polymer is dissolved in water to form an aqueous solution with a concentration of preferably 0.1 g / ml.

[0042] Slowly add antimony trichloride ethanol solution with a concentration of preferably 0.2 mol / L to the chitosan aqueous solution, so that the mass ratio of chitosan macromolecule to antimony chloride is 0.8.

[0043] After magnetic stirring for 24 h, the turbid solution was freeze-dried for 48 h.

[0044] The freeze-dried precursor was placed in Ar / 5%wtH 2 atmosphere, sintering at 750°C for 6 hours, and the carbon-coated nano-antimony composite material can be prepared.

[0045] Such as figure 1 As shown, it is a transmission electron microscope schematic diagram of the prepared carbon-coated nano-antimony composite material. In this example, the proportion of polymer carbon source is relatively small, and the ...

Embodiment 2

[0048] The chitosan water-soluble polymer is dissolved in water to form an aqueous solution with a concentration of 0.01 g / ml.

[0049] Slowly add antimony trichloride ethanol solution with a concentration of 0.05 mol / L to the chitosan aqueous solution, so that the mass ratio of chitosan macromolecule to antimony chloride is 2.

[0050] After magnetic stirring for 12 h, the cloudy solution was freeze-dried for 24 h.

[0051]The freeze-dried precursor was placed in Ar / 5%wtH 2 atmosphere, sintering at 650°C for 3 hours, and the carbon-coated nano-antimony composite material can be prepared.

[0052] Such as figure 2 As shown, it is a transmission electron microscope schematic diagram of the prepared carbon-coated nano-antimony composite material. Compared with Example 1, the polymer carbon source added in this example is relatively high, and the average particle size of the synthesized material is 50nm. Smaller than Example 1, the particles are evenly distributed in the carb...

Embodiment 3

[0055] The chitosan water-soluble polymer is dissolved in water to form an aqueous solution with a concentration of 0.005 g / ml.

[0056] The antimony trichloride ethanol solution with a concentration of 0.01 mol / L is slowly added to the chitosan aqueous solution, so that the mass ratio of the chitosan polymer to the antimony chloride is 1.

[0057] After magnetic stirring for 6 h, the turbid solution was freeze-dried for 36 h.

[0058] The freeze-dried precursor was placed in Ar / 5%wtH 2 atmosphere, sintering at 450°C for 10 hours, the carbon-coated nano-antimony composite material can be prepared.

[0059] Such as image 3 As shown, it is a transmission electron microscope schematic diagram of the prepared carbon-coated nano-antimony composite material. In this embodiment, the carbon source addition ratio and solution concentration are better, and the average particle diameter of the synthetic material is 10nm, which is more than that of Examples 1 and 2. finer and more eve...

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Abstract

The invention discloses a preparation method of a carbon-coated nano-antimony composite material. The preparation method of the carbon-coated nano-antimony composite material comprises the following steps: dissolving water-soluble polymers in water to prepare a water-soluble polymer aqueous solution to be used as a carbon source; dissolving one or more of antimony halide, antimony phosphate and antimony sulfate in an organic solvent to form an antimonide organic solvent; dropwise adding the antimonide organic solvent into the water-soluble polymer aqueous solution so as to obtain a mixed solution,; and freezing the mixed solution, drying, and sintering in a reducing atmosphere to obtain the carbon-coated nano-antimony composite material. The invention also discloses the carbon-coated nano-antimony composite material prepared by adopting the method and application of the carbon-coated nano-antimony composite material as a battery negative material. By virtue of the preparation method of the carbon-coated nano-antimony composite material, the carbon-coated nano-antimony composite material can be simply and easily prepared; the advantage of antimony used as an electrode material is utilized to the greatest extent; the composite material is used for synthesizing a secondary battery negative material with the high capacity, and excellent rate capability and cycle performance.

Description

technical field [0001] The invention belongs to the field of battery technology, and in particular relates to a battery negative electrode material and a preparation method and application thereof. Background technique [0002] As a key component in an ion battery such as a sodium-ion battery or a lithium-ion battery, the type and performance of the negative electrode material is a key factor that determines the performance of the battery and whether it can be widely used. [0003] The Chinese patent application with the application number 201210038789.0 discloses a negative electrode material, which is used in a sodium ion battery and consists of a metal M that can form an alloy with sodium ions and an inert medium A, where M is a sodium that can form an alloy with sodium ions. Alloy metals, such as one or more of Sn, Sb, Pb; A is an inert medium, such as carbon materials, conductive polymers, Cu, Fe, Al, Ti, SiC, TiC, WC, TiN, TiB One or more; in this type of material, M ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M4/36B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/366H01M4/38H01M10/0525H01M10/054Y02E60/10
Inventor 张五星段建张伟黄云辉
Owner HUAZHONG UNIV OF SCI & TECH
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