Synthetic method for size-controllable silicon nanotubes for lithium ion batteries

A lithium-ion battery, silicon nanotube technology, applied in nanotechnology, nanotechnology, silicon compounds and other directions for materials and surface science, can solve the problem that the aspect ratio and thickness are difficult to effectively control, and the size of the hydrothermal method is difficult to synthesize. Controllability, can not well reflect the characteristics of silicon nanotubes, etc., to achieve the effect of improving the volume expansion effect, regulating the wall thickness, and solving the volume expansion effect

Inactive Publication Date: 2017-11-17
GUIZHOU UNIV
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Problems solved by technology

[0003] The current methods of synthesizing silicon nanotubes mainly include template method, hydrothermal method, etc., but there are some problems: the template method is the disordered accumulation of silicon atoms on the template, which cannot well reflect the properties of silicon nanotubes when used as a negative electrode material. chara...

Method used

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  • Synthetic method for size-controllable silicon nanotubes for lithium ion batteries
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  • Synthetic method for size-controllable silicon nanotubes for lithium ion batteries

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Effect test

Embodiment 1

[0032] Embodiment 1: a kind of synthetic method that is used for lithium-ion battery size thyristor nanotube, comprises the steps:

[0033] (1) Preparation of mesoporous silica nanorods: 6 parts of ethyl orthosilicate, 1.3 parts of cetyltrimethylammonium bromide, 0.2 parts of polyethylene glycol-4000, 6 parts of ammonia water, 92.5 parts of pure water Parts were magnetically stirred at 28°C for 18 hours, centrifuged, and dried to obtain mesoporous silica nanorods with a diameter of 200-500nm and a length of 1-4um;

[0034] (2) Mesoporous silica nanorods are etched into tubes: Disperse 2 parts by mass of mesoporous silica nanorods in 96.5 parts by mass of pure water, add 0.7 parts by mass of a surface-protecting For polyethyleneimine with effect and etching effect, heat to 120°C, stir magnetically for 5 hours, and let it stand for 4 hours; centrifuge, wash, and vacuum dry to constant weight to obtain silica nanotubes;

[0035] (3) Silica nanotubes are reduced to silicon nanotu...

Embodiment 2

[0036] Embodiment 2: a kind of synthetic method that is used for lithium-ion battery size thyristor nanotube, comprises the steps:

[0037] (1) Preparation of mesoporous silica nanorods: 2 parts of ethyl orthosilicate, 0.5 parts of cetyltrimethylammonium bromide, 0.1 part of polyoxyethylene polyoxypropylene ether block copolymer, 3 parts of ammonia water Parts, 90 parts of pure water, magnetically stirred at 20°C for 24 hours, centrifuged, and dried to obtain mesoporous silica nanorods with a diameter of 200-500nm and a length of 1-4um;

[0038] (2) Mesoporous silica nanorods are etched into tubes: Disperse 1 part by mass of mesoporous silica nanorods in 95 parts by mass of pure water, and add 1 part by mass of mesoporous silica nanorods with surface protection For polyethyleneimine with effect and etching effect, heat to 90°C, stir magnetically for 2 hours, and let it stand for 2 hours; centrifuge, wash, and vacuum dry to constant weight to obtain silica nanotubes;

[0039] ...

Embodiment 3

[0040] Embodiment 3: a kind of synthetic method that is used for lithium-ion battery size thyristor nanotube, comprises the steps:

[0041] (1) Preparation of mesoporous silica nanorods: 4 parts of ethyl orthosilicate, 0.9 parts of cetyltrimethylammonium bromide, 0.15 parts of polyethylene glycol-4000, 5 parts of ammonia water, 91.5 parts of pure water Magnetic stirring at 25°C for 24 hours, centrifugation, and drying to obtain mesoporous silica nanorods with a diameter of 200-500nm and a length of 1-4um;

[0042] (2) Mesoporous silica nanorods are etched into tubes: Disperse 1.5 parts by mass of mesoporous silica nanorods in 96 parts by mass of pure water, and add 0.6 parts by mass of a surface-protecting For polyethyleneimine with effect and etching effect, heat to 110°C, stir magnetically for 12 hours, and let stand for 8 hours; centrifuge, wash, and vacuum dry to constant weight to obtain silica nanotubes;

[0043] (3) Reduction of silica nanotubes to silicon nanotubes: p...

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Abstract

The invention discloses a synthesis method of size-controllable silicon nanotubes for lithium ion batteries. The method comprises the steps as follows: firstly, magnetically stirring a silicon source, a template agent, a dispersant, a catalyst and a solvent at a temperature of 20-35 DEG C for 12-24 hours, and performing centrifugation and drying to obtain mesoporous silica nanorods; then dispersing the mesoporous silica nanorods in a solvent, adding a surfactant with a surface protection effect and an etching effect, heating the mixed solution to 90-150 DEG C, performing magnetic stirring for 2-12 hours, allowing the mixed solution to stand for 2-8 hours, and performing centrifugation, cleaning and vacuum drying to constant weight to obtain silica nanotubes; finally, calcining the silica nanotubes with a reducing agent in a tube furnace at 640-670 DEG C under the protection of argon for 2-4 h to obtain the silicon nanotubes. The synthesis method has the characteristics that the volume expansion effect in the processes of charge and discharge of silicon lithium ion battery anode materials can be well solved, and the length/diameter ratio and the thickness dimension of the silicon nanotubes can be effectively controlled.

Description

technical field [0001] The invention relates to a method for synthesizing silicon nanotubes, in particular to a method for synthesizing silicon controlled silicon nanotubes with the size of lithium ion batteries. Background technique [0002] Since the synthesis of carbon nanotubes, because of their large specific surface area and cavity structure, they have become a research hotspot for scientific researchers. application. Silicon is currently an ideal anode material for lithium-ion batteries. It has high theoretical specific capacity and low lithium intercalation potential. Silicon is sp3 hybridized, and it is not easy to form a tubular structure, but tends to form a linear solid structure. Then it is easy to form silicon nanowires when preparing silicon nanomaterials. [0003] The current methods of synthesizing silicon nanotubes mainly include template method, hydrothermal method, etc., but there are some problems: the template method is the disordered accumulation o...

Claims

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Application Information

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IPC IPC(8): C01B33/021B82Y30/00B82Y40/00
CPCC01B33/021B82Y30/00B82Y40/00C01P2004/13C01P2004/62C01P2004/64
Inventor 吴复忠陈敬波卢江腾
Owner GUIZHOU UNIV
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