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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 performance under high current, and the capacity drops significantly after 50 cycles of charging and discharging at different rates of current.

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

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Experimental program
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Effect test

Embodiment 1

[0034] A preparation method of a graphene half-coated tin dioxide nanoparticle cluster composite material, comprising the following steps:

[0035] The 1st (1) step, under stirring state, surfactant is dissolved in tin dioxide hydrosol, concrete steps are as follows: the hydrosol containing the tin dioxide nanoparticle that diameter is 2nm is diluted to 20g / L, gets 20mL, 0.5 g of surfactant P123 was added thereto under stirring, and stirred to dissolve it.

[0036] In the (2) step, 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 2 mL of glucose solution with a concentration of 200 g / L, and then add 4 mL of aqueous dispersion of small-diameter graphene oxide (diameter of small-diameter graphene oxide is 200-1000 nm) with a concentration of 10 g / L, and continuously stirred for 2 h.

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

Embodiment 2

[0041] Graphene half-coated tin dioxide nanoparticle cluster composite material preparation method, comprising the following steps:

[0042] The 1st (1) step, under stirring state, surfactant is dissolved in tin dioxide hydrosol, concrete steps are as follows: the hydrosol containing the tin dioxide nanoparticle that diameter is 5nm is diluted to 1g / L, gets 400mL, Add 5g of surfactant polyacrylamide therein under stirring state, stir to make it dissolve.

[0043] In the (2) step, 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 500 mL of sodium alginate solution with a concentration of 2 g / L, Subsequently, 100 mL of an aqueous dispersion of small-diameter graphene oxide (diameter of small-diameter graphene oxide is 200-1000 nm) with a concentration of 0.2 g / L was added, and stirring was continued for 0.5 h.

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

Embodiment 3

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

[0048] The 1st (1) step, under stirring state, surfactant is dissolved in tin dioxide hydrosol, concrete steps are as follows: the hydrosol containing the tin dioxide nanoparticle that diameter is 10nm is diluted to 50g / L, gets 8mL, Add one or more of P123, F127, sodium dodecylsulfonate, sodium dodecylbenzenesulfonate, polyacrylamide, stearate or fatty alcohol sulfate to it under stirring state. EXAMPLES 1g of surfactant F127 was added and stirred to dissolve it.

[0049] In the (2) step, 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: adding 50 mL of chitosan solution with a concentration of 20 g / L, Subsequently, ...

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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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