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Method for preparing carbon coated nano flaky tin oxide material

A technology of carbon-coated nano and nano-sheets, which is applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve problems such as volume expansion, low specific capacity of electrode materials, and poor cycle performance. Achieve the effects of non-toxic materials, simple and easy experiments, and good application prospects

Inactive Publication Date: 2015-04-29
SHANGHAI NAT ENG RES CENT FORNANOTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of the problems existing in the above-mentioned tin dioxide electrode material, the purpose of the present invention is to solve the problems of low specific capacity, volume expansion and poor cycle performance of the electrode material during charging and discharging of lithium ions

Method used

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  • Method for preparing carbon coated nano flaky tin oxide material
  • Method for preparing carbon coated nano flaky tin oxide material
  • Method for preparing carbon coated nano flaky tin oxide material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Weigh 0.005mol of SnCl 2 2H 2 O was added to 100ml of acetylacetone solvent to prepare a 0.05 mol / L tin acetylacetonate solution.

[0028] (2) Take 80 parts of tin acetylacetonate solution with the above configuration of 0.05mol / L, add 20 parts of sodium hydroxide with a mass concentration of 3.2% dropwise, and stir at room temperature for 10 min until a white turbid solution appears.

[0029] (3) Add 50 parts of glucose to the solution obtained in step (2), stir for 20 minutes, and mix well.

[0030] (4) Pour the solution obtained in step (3) into a polytetrafluoroethylene-lined reactor, heat and react in an oven at 180°C for 4 hours, and cool naturally.

[0031] (5) The solution obtained in step (4) was washed with deionized water and ethanol three times in sequence, dried at 60°C for 2h, and then calcined at 450°C for 2h in nitrogen to obtain carbon-coated tin dioxide nanosheets.

Embodiment 2

[0033] (1) Weigh 0.005 mol of stannous 2-ethylhexanoate into 100 ml of ethanol solvent to prepare 0.05 mol / L tin ethoxide solution.

[0034] (2) Take 100 parts of the above-mentioned 0.05 mol / L tin ethoxide solution, add 25 parts of potassium hydroxide with a mass concentration of 3.2% dropwise, and stir at room temperature for 60 min until a white turbid solution appears.

[0035] (3) Add 200 parts of PMMA to the solution obtained in step (2) and stir for 60 minutes, and mix well.

[0036] (4) Pour the solution obtained in step (3) into a polytetrafluoroethylene-lined reactor, heat and react in an oven at 240°C for 8 hours, and cool naturally.

[0037] (5) The solution obtained in step (4) was centrifuged three times with deionized water and ethanol in sequence, dried at 60°C for 2h, and then calcined at 650°C in nitrogen for 7h to obtain carbon-coated tin dioxide nanosheets.

Embodiment 3

[0039] (1) Weigh 0.005 mol of stannous oxalate and add it into 100 ml of ethanol solvent to prepare 0.05 mol / L tin ethanol solution.

[0040] (2) Take 90 parts of the above-mentioned 0.05mol / L tin ethoxide solution, add 22 parts of ammonia water with a mass concentration of 3.2% dropwise, and stir at room temperature for 30 min until a white turbid solution appears.

[0041] (3) Add the solution obtained in step (2) to 100 parts of PMMA and stir for 40 minutes, and mix well.

[0042] (4) Pour the solution obtained in step (3) into a polytetrafluoroethylene-lined reactor, heat and react in an oven at 200°C for 6 hours, and cool naturally.

[0043] (5) The solution obtained in step (4) was washed with deionized water and ethanol three times in sequence, dried at 60°C for 2h, and then calcined at 550°C in nitrogen for 5h to obtain carbon-coated tin dioxide nanosheets.

[0044] The results show that the carbon-coated nano-tin dioxide prepared by the present invention is a sheet ...

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Abstract

The invention discloses a method for preparing a carbon coated nano flaky tin oxide material. A carbon coated nano flaky tin oxide (SnO2 / C) cathode material can be prepared by using an improved one-step hydrothermal method, that is, a complexing assisting-pre-precipitation-hydrothermal method. The method is simple and convenient, preparation steps of a conventional two-step hydrothermal method coated material are simplified, the carbon coated nano flaky tin oxide (SnO2 / C) composite lithium ion electrode cathode material prepared by using the method is beneficial to relieving the problem that the volume of a single tin oxide nano electrode is expanded in the charge / discharge process, the circulation property of the battery is improved, the specific capacity of the battery is increased, and the service life of the battery is prolonged. At the room temperature, the first discharge capacity of the battery at the 0.5C multiplying power is up to 757mAh / g. The method and the structure have important significance in application of lithium ion battery electrode materials.

Description

technical field [0001] The invention belongs to the field of preparation of nanocomposite materials and electrode materials. Specifically relates to a preparation method of a carbon-coated tin dioxide nanosheet lithium battery negative electrode material. Background technique [0002] In recent years, with the rapid development of the economy, electronic products have become a necessity in daily life, and lithium-ion batteries, as the latest generation of green high-energy rechargeable batteries, are the fastest-growing secondary batteries in commercialization and have broad market application prospects. The negative electrode material of the battery is the key factor determining the overall performance of lithium-ion batteries, but lithium-ion batteries still have problems such as low actual specific capacity, volume expansion during lithium-ion charging and discharging, and poor cycle performance, which are far from meeting actual needs. . With the increasing development...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/48B82Y30/00
CPCB82Y30/00H01M4/362H01M4/48H01M4/62Y02E60/10
Inventor 何丹农张迎王艳丽吴晓燕
Owner SHANGHAI NAT ENG RES CENT FORNANOTECH
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