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Method for preparing composite material of stannic oxide/polyaniline

A technology of tin dioxide and composite materials, applied in the field of material science, can solve the problems of electrode capacity attenuation, loss of electrical contact of electrode particles, change of metal oxide stoichiometric ratio, etc., to achieve the effects of low cost, wide source and simple process

Inactive Publication Date: 2012-10-03
SHANDONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, experiments have shown that this process also has the following two disadvantages: First, because ammonia easily forms complexes with metal ions and dissolves in water to a certain extent, it is possible to change the properties of metal oxides by washing the precipitate with deionized water. stoichiometric ratio
In addition, when tin dioxide is used as the negative electrode material of lithium-ion batteries, during the cycle of tin and lithium alloying and dealloying, this material is accompanied by a huge volume change, and the electrode is prone to powdering and cracking. loss of electrical contact between them, resulting in electrode capacity decay

Method used

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  • Method for preparing composite material of stannic oxide/polyaniline
  • Method for preparing composite material of stannic oxide/polyaniline

Examples

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Effect test

Embodiment 1

[0029] Embodiment 1 prepares a kind of tin dioxide / polyaniline composite material, concrete steps are as follows:

[0030] Preparation of nano tin dioxide powder:

[0031] a. First, add 50ml of ethylene glycol into a 100ml four-necked flask, heat it to about 80°C and keep it at a constant temperature, add 13g of crystalline tin tetrachloride into the flask, and stir it magnetically for 5 minutes to obtain a colorless and transparent precursor solution.

[0032] b. Continue to heat the solution to 120°C for reaction, stir at medium speed for 5h, stop stirring and continue to react for 10h. Nitrogen gas was introduced into the flask, and the reaction temperature was kept at about 120°C. The water and hydrogen chloride generated during the reaction will volatilize in large quantities until a viscous tan gel is obtained.

[0033] c. The gel was aged at room temperature for 1 h, and then dried in a drying oven at 140° C. for 10 h to obtain a xerogel.

[0034] d. Finally, place t...

Embodiment 2

[0040] Embodiment 2 prepares a kind of tin dioxide / polyaniline composite material, concrete steps are as follows:

[0041] Preparation of nano tin dioxide powder:

[0042] a. First, add 30ml of ethylene glycol into a 100ml four-neck flask, heat it to about 80°C and keep it at a constant temperature, add 13g of crystalline tin tetrachloride into the flask, and stir it magnetically for 5 minutes to obtain a colorless and transparent precursor solution.

[0043] b. Continue to heat the solution to 120°C for reaction, stir at medium speed for 5h, stop stirring and continue to react for 10h. Nitrogen gas was introduced into the flask, and the reaction temperature was kept at about 120°C. The water and hydrogen chloride generated during the reaction will volatilize in large quantities until a viscous tan gel is obtained.

[0044] c. The gel was aged at room temperature for 1 h, and then dried in a drying oven at 140° C. for 15 h to obtain a xerogel.

[0045] d. Finally, place the...

Embodiment 3

[0051] Embodiment 3 prepares a kind of tin dioxide / polyaniline composite material, concrete steps are as follows:

[0052] Preparation of nano tin dioxide powder:

[0053] a. First add 40ml of ethylene glycol to a 100ml four-neck flask, heat it to about 80°C and keep it at a constant temperature, add 13g of crystalline tin tetrachloride to the flask, and stir it magnetically for 5 minutes to obtain a colorless and transparent precursor solution.

[0054] b. Continue to heat the solution to 120°C for reaction, stir at medium speed for 5h, stop stirring and continue to react for 10h. Nitrogen gas was introduced into the flask, and the reaction temperature was kept at about 120°C. The water and hydrogen chloride generated during the reaction will volatilize in large quantities until a viscous tan gel is obtained.

[0055] c. The gel was aged at room temperature for 1 h, and then dried in a drying oven at 140° C. for 20 h to obtain a xerogel.

[0056] d. Finally, place the xero...

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Abstract

The invention discloses a method for preparing composite material of stannic oxide / polyaniline. The method comprises the steps of taking stannic chloride as material and ethylene glycol as solvent, preparing nano stannic oxide powder material of which the mean grain size is about 1.5nm by a sol-gel process; taking aniline and prepared nano stannic oxide as materials, using sodium dodecyl sulfate,n-butyl alcohol and ammonium persulfate, and preparing the composite material of stannic oxide / polyaniline by adopting a microemulsion in-situ polymerization method. The method disclosed by the invention is easy to obtain the material, simple in synthesis and low in cost; the conductive polymer polyaniline in the prepared composite material not only can improve the conductive property of stannic oxide, but also can restrain agglomeration of nano stannic oxide at a certain extent. In addition, the existence of a conductive polymer network structure can effectively ensure electric contact between stannic oxide particles when electrode reacts, so that the composite material is expected to be excellent lithium ion battery negative electrode material.

Description

technical field [0001] The invention belongs to the field of material science, in particular to a preparation method of a tin dioxide / polyaniline composite material. Background technique [0002] As a new generation of lithium-ion battery anode materials, tin-based oxides have attracted extensive attention from researchers due to their considerable material properties such as volume specific capacity and mass specific capacity. The sol-gel method is an effective method for the preparation of nanomaterials, and is widely used in the preparation of various nanomaterials, especially tin dioxide nanoparticles. [0003] There are two main types of precursors for the preparation of tin dioxide by the sol-gel method: one is tin alkoxide, and the other is tin chloride. However, when tin alkoxide is used as a precursor to prepare tin oxide, the operation process is complicated and the cost is high. Using tin tetrachloride as the precursor and water as the solvent overcomes these sh...

Claims

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Application Information

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IPC IPC(8): C08G73/02C08K3/22C01G19/02
Inventor 石元昌孙立波何召品苏朔李波
Owner SHANDONG UNIV
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