In-situ etching method for preparing hollow tin-based oxide/carbon composite nano-material

A nanomaterial and oxide technology, applied in the field of material synthesis and electrochemistry, can solve problems such as unfavorable environmental protection, cumbersome operation, time-consuming and labor-intensive, etc., and achieve the effects of energy saving, simple process and environmental friendliness.

Inactive Publication Date: 2013-10-09
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the traditional hard template method needs to be treated with strong acid or strong alkali to remove the template

Method used

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  • In-situ etching method for preparing hollow tin-based oxide/carbon composite nano-material
  • In-situ etching method for preparing hollow tin-based oxide/carbon composite nano-material
  • In-situ etching method for preparing hollow tin-based oxide/carbon composite nano-material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A. Preparation of carbon-coated silica nanomaterials (references AntonioB.Fuertes, et al., Chem.Commun ., 2012, 48, 6124-6126.)

[0024] a. Measure 40ml of a mixture of ethanol (ethanol) and deionized water (the volume ratio of ethanol and water is 2:1), add 1.3ml of ammonia water (NH 3 ·H 2 O), mix evenly, and stir at 30°C for 0.5h; measure 1.4ml tetraethyl orthosilicate (TEOS) and add it to the above solution, after mixing, weigh 0.2g resorcinol with an electronic balance, completely After dissolving, add 0.3ml formaldehyde solution (37wt%) and continue the reaction for 24h;

[0025] b. Put the above mixed solution into a 100ml autoclave lined with polytetrafluoroethylene, and react at 110°C for 24h; Drying and other steps can obtain the template required for the preparation of the present invention—carbon-coated silicon dioxide nanometer material.

[0026] B. Preparation of tin-based oxide / carbon composite nanomaterials

[0027] a. Use an electronic balance to w...

Embodiment 2

[0033] The preparation process and steps of this embodiment are exactly the same as in Example 1, except that in the B(c) step:

[0034] The above materials are heat-treated at 600° C. in an air atmosphere to obtain the hollow tin-based oxide / carbon composite nanomaterial as the final product prepared in the present invention.

[0035] The obtained result is basically similar in appearance to Example 1, but the crystal phase is completely different. The product obtained in this example is a pure-phase tin dioxide / carbon composite nanomaterial.

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Abstract

The invention relates to a preparation method of a hollow tin-based oxide/carbon composite nano-material, and belongs to the technical field of material synthesis and electrochemistry. The method comprises: taking a carbon coated silica composite material as a template, stannous chloride (SnCl2-H2O(1/2)) as a tin source, urea as an alkali source, and water as a solvent, adopting a simple in-situ etching hydrothermal crystallization method for generation of a stannic oxide based nano-material and successful removing of the silica template at the same time, to obtain the tin-based oxide/carbon composite nano-material with a hollow spherical structure and homogeneous morphology. In the method, the raw material ratio of the tin source and urea is the key of the method. And more important, by simple control of the subsequent heat treatment temperature, the carbon composite nano-materials of stannous oxide (SnO) and of tin oxide (SnO2) with two totally different crystal phases can be obtained.

Description

technical field [0001] The invention relates to a method for preparing a hollow tin-based oxide / carbon composite nanomaterial, belonging to the technical fields of material synthesis and electrochemistry. Background technique [0002] With the rapid development of technology and electronic products, lithium-ion batteries are more and more widely used in related products. At present, commercial lithium-ion batteries mainly use graphite-like carbon materials as negative electrode materials. However, due to their low theoretical specific capacity (372 mAh g -1 ) and far from meeting people's demand for large capacity, high power and miniaturized lithium-ion batteries. Compared with graphitized carbon materials, lithium alloy anode materials and metal oxide materials (SnO x ,TiO 2 , CoO, etc.) have a large theoretical specific capacity. Such as: SnO 2 The theoretical gravimetric capacity is as high as 782 mAh·g -1 , 2-3 times higher than the theoretical capacity of graphi...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/48
CPCY02E60/10
Inventor 张海娇焦正郭敬新陈志文耿洪亚胡乐
Owner SHANGHAI UNIV
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