Preparation method for stannic oxide/carbon composite hollow balls

A tin dioxide and carbon composite technology, applied in the field of material science, can solve problems such as low output and cumbersome steps, and achieve the effect of simplifying process steps, reducing costs, and realizing mass production

Active Publication Date: 2011-05-11
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, the method of preparing tin dioxide / carbon composite hollow spheres mainly uses silica spheres or carbon spheres as hard templates, and the templates need to be removed during the reaction; in addition, these methods require the introduction of tin dioxide through multi-step reactions. and carbon components, the steps are cumbersome and the output is low, thus limiting the mass production and application of tin dioxide / carbon composite hollow spheres

Method used

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  • Preparation method for stannic oxide/carbon composite hollow balls
  • Preparation method for stannic oxide/carbon composite hollow balls
  • Preparation method for stannic oxide/carbon composite hollow balls

Examples

Experimental program
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Effect test

Embodiment 1

[0021] (1) 200 mg of tin balls with a diameter of about 100 nanometers were added to 40 ml of 0.25 mol / L glucose aqueous solution, and ultrasonicated for 10 minutes.

[0022] (2) Transfer the mixed solution obtained in step (1) to a 50 ml hydrothermal reaction kettle, raise the temperature to 180° C., keep the temperature for 180 minutes, cool down to room temperature, centrifuge and dry.

[0023] (3) The product obtained in step (2) is heat-treated in a nitrogen atmosphere at a temperature of 500° C. and kept for 180 minutes to obtain the final product, which is a tin dioxide / carbon composite hollow sphere.

[0024] figure 1 , figure 2 and image 3 These are the scanning electron micrographs, transmission electron micrographs and X-ray diffraction patterns of the tin dioxide / carbon composite hollow spheres synthesized in this example, respectively. From Figure 1~3 It can be seen that the diameter of the obtained composite hollow sphere is 100-200 nanometers, the thickne...

Embodiment 2

[0026] (1) Add 60 mg of tin balls with a diameter of about 10 nanometers into 40 ml of 0.01 mol / L glucose aqueous solution, and sonicate for 1 minute.

[0027] (2) Transfer the mixed solution obtained in step (1) to a 50 ml hydrothermal reaction kettle, raise the temperature to 160° C., keep the temperature for 720 minutes, cool down to room temperature, centrifuge and dry.

[0028] (3) heat-treating the product obtained in step (2) in a nitrogen atmosphere at a heat treatment temperature of 400° C. for 300 minutes to obtain the final product, which is a tin dioxide / carbon composite hollow sphere. The result is similar to Example 1.

Embodiment 3

[0030] (1) 20 mg of tin balls with a diameter of about 1000 nm were added to 40 ml of 0.25 mol / L glucose aqueous solution, and ultrasonicated for 20 minutes.

[0031] (2) Transfer the mixed solution obtained in step (1) to a 50 ml hydrothermal reaction kettle, raise the temperature to 170° C., keep the temperature for 360 minutes, cool down to room temperature, centrifuge and dry.

[0032] (3) heat-treating the product obtained in step (2) in a nitrogen atmosphere at a heat treatment temperature of 450° C. and keeping it warm for 200 minutes to obtain the final product, which is a tin dioxide / carbon composite hollow sphere. The result is similar to Example 1.

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Abstract

The invention discloses a preparation method for stannic oxide/carbon composite hollow balls. Solder balls are added into an aqueous solution of glucose for ultrasonic dispersion, and then is transferred to a hydro-thermal reaction kettle; then the temperature is raised to 160-200 DEG C, and preserved for 30-720 minutes; after the reaction, centrifugal separation and drying are implemented; and then thermal treatment is implemented under nitrogen atmosphere to obtain a final product. In the preparation method, the solder balls are served as sacrificial templates, which do not need to be removed after the reaction; therefore, mass production can be realized; stannic oxide/carbon composite hollow balls are synthesized through simple one-step hydro-thermal reaction, which further simplifies processing steps, and reduces the cost; moreover, the proportions of stannic oxide to carbon are controllable, which is beneficial for subsequently intensive study on the performances of lithium ion batteries manufactured by stannic oxide/carbon composite hollow balls.

Description

technical field [0001] The invention belongs to the field of material science, and in particular relates to a preparation method of tin dioxide / carbon composite hollow spheres. Background technique [0002] Tin dioxide has a relatively high theoretical capacity, so it is considered to be one of the ideal substitutes for graphite-like carbon materials in the negative electrode of lithium-ion batteries. However, due to the huge volume change during the charging and discharging process, it will lead to the pulverization of the tin dioxide electrode material, and its capacity will drop sharply; in addition, the first charge and discharge efficiency of the tin dioxide electrode material is very low, which limits its use as Commercial application of lithium-ion battery anode materials. [0003] The preparation of tin dioxide into hollow spheres can alleviate the above problems to a certain extent, because the hollow spheres have a larger surface area, a shorter lithium ion diffus...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/139
CPCY02E60/10
Inventor 杜宁杨德仁张辉吴平
Owner ZHEJIANG UNIV
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