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Preparation method of silicon/folded graphene electrode material

A graphene electrode and graphene technology, applied in negative electrodes, battery electrodes, active material electrodes, etc., can solve the problems of complicated steps, waste, and time-consuming, and achieve easy control, low energy consumption, and low equipment requirements Effect

Inactive Publication Date: 2019-02-12
YANCHENG TEACHERS UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the volume of silicon can expand to 300% during the charge and discharge process, ordinary coating cannot completely buffer the impact of the volume effect. Cui Yi et al. first prepared a layer of SiO outside the Si particles. 2 , and then coated with carbon materials to prepare Si / SiO from the inside out 2 / C composite structure, using hydrochloric acid to corrode the middle layer SiO 2 , forming a hollow core-shell structure, and the vacated space effectively relieves the volume expansion of silicon; however, the method for preparing the hollow structure is complicated, requires precise control and takes a lot of time, and the corroded part forms a waste, and there is an urgent need for a Simpler and more effective way to solve the volume effect of silicon

Method used

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  • Preparation method of silicon/folded graphene electrode material
  • Preparation method of silicon/folded graphene electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Add 1 g of silicon-aluminum alloy particles to an aqueous solution containing 1 g of graphene oxide, ultrasonically disperse for 1 h, and suction filter to form a composite film.

[0024] (2) When the film is not completely dry, add the film to a hydrochloric acid solution with a mass fraction of 10% for 2 hours.

[0025] (3) Take out the film and let it dry naturally.

[0026] (4) Heat the powder at a temperature of 70° C. for 4 hours.

[0027] (5) Put the film into a hydroiodic acid solution for reduction for 1 h, and wash it with ethanol to obtain a silicon / wrinkled graphene electrode material.

[0028] figure 1 A transmission electron microscope image of graphene oxide was prepared for this example.

[0029] figure 2 SEM image of the silicon / wrinkled graphene electrode material prepared for this example.

Embodiment 2

[0031] (1) Add 1 g of silicon-aluminum alloy particles to an aqueous solution containing 5 g of graphene oxide, ultrasonically disperse for 1 h, and suction filter to form a composite film.

[0032] (2) When the film is not completely dry, add the film to a hydrochloric acid solution with a mass fraction of 10% for 2 hours.

[0033] (3) Take out the film and let it dry naturally.

[0034] (4) Heat the powder at a temperature of 70° C. for 4 hours.

[0035] (5) Put the film into a hydroiodic acid solution for reduction for 1 h, and wash it with ethanol to obtain a silicon / wrinkled graphene electrode material.

Embodiment 3

[0037] (1) Add 1 g of silicon-aluminum alloy particles to an aqueous solution containing 1 g of graphene oxide, ultrasonically disperse for 1 h, and suction filter to form a composite film.

[0038] (2) When the film is not completely dry, add the film to a hydrochloric acid solution with a mass fraction of 10% for 6 hours.

[0039] (3) Take out the film and let it dry naturally.

[0040] (4) Heat the powder at a temperature of 70° C. for 4 hours.

[0041] (5) Put the film into a hydroiodic acid solution for reduction for 1 h, and wash it with ethanol to obtain a silicon / wrinkled graphene electrode material.

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Abstract

The invention provides a preparation method of a silicon / folded graphene electrode material. Silicon-aluminum alloy particles are added into an graphene oxide solution and dispersed evenly through ultrasound, and suction filtration is conducted to form a composite thin film; the thin film is added into a diluted hydrochloric acid solution to react while being not completely dried; the thin film istaken out and naturally air-dried, and then heated so as to remove the residual solvent; graphene oxide is reduced by using a hydroiodic acid solution and washed with ethyl alcohol, and the silicon / folded graphene electrode material is obtained. Folded graphene in the method can be applied to enhance the charging property and the electricity storage property of a lithium battery, and can preventlithium from forming branched crystals. In addition, hydrochloric acid reacts with aluminum to generate gas, so that the interior of the graphene oxide thin film can generate a mass of folds; the reacted aluminum can also generate gaps to cause an effect similar to a hollow core-shell structure; high-elastic folded graphene can be compressed, and can effectively buffer volume expansion of silicon.

Description

technical field [0001] The invention relates to the field of preparation of electrode materials, in particular to a method for preparing a silicon / wrinkled graphene film material. Background technique [0002] Lithium batteries are used in a wide range of applications, such as mobile phones, tablets, laptops, flashlights, digital cameras, LEDs, electric toys, electric vehicles, etc. Silicon has a very high mass-specific capacity and volume-specific capacity, and has a wider range of applications for electrolytes. The high lithium-deintercalation potential can effectively avoid the precipitation of lithium during high-rate charging and discharging, and can improve the safety of the battery. Therefore, Silicon is considered to be the most potential anode material for a new generation of high-capacity lithium-ion batteries. Due to the influence of the huge volume effect, the silicon electrode material will be pulverized and peeled off from the current collector during the char...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/052
CPCH01M4/366H01M4/386H01M4/625H01M4/628H01M10/052H01M2004/021H01M2004/027Y02E60/10
Inventor 苗中正田华雨苗中明
Owner YANCHENG TEACHERS UNIV
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