Preparation method of graphene half-coated tin dioxide nanometer particle cluster composite material

A technology of tin dioxide and nanoparticles, applied in the direction of secondary batteries, electrochemical generators, electrical components, etc., can solve problems such as unsatisfactory performance and capacity drop, achieve effective and rapid embedding and extraction, slow down loss, improve The effect of transmission efficiency

Inactive Publication Date: 2017-01-04
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The tin dioxide particles in the material prepared by this method are only distributed on the surface of graphene, resulting in unsatisfactory

Method used

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  • Preparation method of graphene half-coated tin dioxide nanometer particle cluster composite material
  • Preparation method of graphene half-coated tin dioxide nanometer particle cluster composite material

Examples

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[0033] Example 1

[0034] A preparation method of graphene semi-coated tin dioxide nano-particle cluster composite material includes the following steps:

[0035] Step (1), while stirring, dissolve the surfactant in the tin dioxide hydrosol. The specific steps are as follows: dilute the hydrosol containing tin dioxide nanoparticles with a diameter of 2nm to 20g / L, take 20mL, 0.5 g of surfactant P123 was added thereto under stirring, and stirred to dissolve.

[0036] In step (2), add the aqueous dispersion of carbohydrates and small-diameter graphene oxide, and continue stirring to obtain a uniform precursor dispersion. The specific steps are as follows: add 2 mL of glucose solution with a concentration of 200 g / L, and then add 4 mL of an aqueous dispersion of small-diameter graphene oxide (the diameter of the small-diameter graphene oxide is 200-1000 nm) with a concentration of 10 g / L, and continuous stirring for 2 hours.

[0037] In step (3), the precursor dispersion obtained in the...

Example Embodiment

[0040] Example 2

[0041] The preparation method of graphene semi-coated tin dioxide nanoparticle cluster composite material includes the following steps:

[0042] Step (1), while stirring, dissolve the surfactant in the tin dioxide hydrosol. The specific steps are as follows: dilute the hydrosol containing tin dioxide nanoparticles with a diameter of 5nm to 1g / L, take 400mL, Under stirring, 5 g of surfactant polyacrylamide was added, and stirred to dissolve.

[0043] In step (2), add the aqueous dispersion of carbohydrates and small-diameter graphene oxide, and continue to stir to obtain a uniform precursor dispersion. The specific steps are as follows: add 500mL of sodium alginate solution with a concentration of 2g / L, Subsequently, 100 mL of an aqueous dispersion of small-diameter graphene oxide (the diameter of the small-diameter graphene oxide is 200-1000 nm) with a concentration of 0.2 g / L is added, and stirring is continued for 0.5 h.

[0044] In step (3), the precursor disper...

Example Embodiment

[0046] Example 3

[0047] A preparation method of graphene half-coated tin dioxide nanoparticle cluster lithium ion battery / sodium ion battery electrode material, comprising the following steps:

[0048] Step (1), while stirring, dissolve the surfactant in the tin dioxide hydrosol. The specific steps are as follows: dilute the hydrosol containing tin dioxide nanoparticles with a diameter of 10nm to 50g / L, take 8mL, Add one or more of P123, F127, sodium dodecyl sulfonate, sodium dodecyl benzene sulfonate, polyacrylamide, stearate or fatty alcohol sulfate to it under stirring. In the example, 1 g of surfactant F127 was added and stirred to dissolve.

[0049] In step (2), add the aqueous dispersion of carbohydrates and small-diameter graphene oxide, and continue to stir to obtain a uniform precursor dispersion. The specific steps are as follows: add 50mL of a chitosan solution with a concentration of 20g / L, Subsequently, 10 mL of an aqueous dispersion of small-diameter graphene oxide ...

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Abstract

The invention relates to a preparation method of a graphene half-coated tin dioxide nanometer particle cluster composite material. The preparation method comprises the following steps of (1) dissolving a surfactant in tin dioxide hydrosol under a stirring state; (2) adding carbohydrate and small graphene oxide, and continuously stirring the mixture to obtain a uniform precursor dispersion system; (3) performing hydrothermal processing on the precursor dispersion system to generate a black precipitant; and (4) drying and calcining the black precipitant to obtain the graphene half-coated tin dioxide nanometer particle cluster composite material. Compared with the prior art, the generation of a solid-electrolyte interface layer can be effectively slowed down when the prepared product is used as an electrode material, more importantly, intercalation and de-intercalation of lithium/sodium ions can be achieved at a high speed, and the reversible charge/discharge capacity of the material under a large current is greatly improved.

Description

technical field [0001] The invention relates to the field of preparation of tin dioxide / graphene composite negative electrode materials, and relates to a method for preparing a graphene half-coated tin dioxide nanoparticle cluster composite material, and the prepared composite material can be used as negative electrodes of ion batteries / sodium ion batteries Material. Background technique [0002] Due to the low electrochemical capacity and poor charge-discharge cycle stability of traditional graphite anode materials used in lithium-ion batteries, people have been working on exploring new lithium-ion battery anode materials with high capacity and high stability for more than two decades . Metal oxides such as tin oxide, iron oxide, cobalt oxide, and manganese oxide have a high theoretical capacity of about 1000mAh / g, and have always been a research hotspot in this field. Among them, tin dioxide is one of the most promising anode materials for a new generation of lithium-ion...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M10/0525
CPCH01M4/366H01M10/0525Y02E60/10
Inventor 朱申敏朱呈岭潘辉李尧石一杉张荻
Owner SHANGHAI JIAO TONG UNIV
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