Preparation method and application of iodine-doped graphene

A graphene and iodine doping technology, applied in the field of materials, can solve the problems of reduced electrical conductivity, insufficient contact between electrolyte and materials, and unsatisfactory electrochemical performance.

Inactive Publication Date: 2017-04-26
深圳市陆星智农科技有限公司 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Although the oxygen-containing functional groups on the surface of graphene oxide can increase its interlayer spacing, it also reduces its conductivity. Therefore, graphene oxide is not a good electrochemical mat...

Method used

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  • Preparation method and application of iodine-doped graphene

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preparation example Construction

[0028] A preparation method for iodine-doped graphene, comprising the following steps:

[0029] S1 Dissolve the iodine source in deionized water to prepare a solution I with a certain concentration;

[0030] S2 Prepare a certain concentration of graphene oxide suspension and add it to solution I. The mass ratio of graphene oxide in the graphene oxide suspension to iodide anions in solution I is 1:4 to 1:60, and mix well. Formation of mixed liquid II;

[0031] S3 Treat the mixed solution II with ultrasonic waves for 3-6 minutes;

[0032] S4 is transferred to a high-pressure reactor with a polytetrafluoroethylene liner for hydrothermal reaction at a temperature of 150°C to 200°C for 10 to 14 hours to reduce graphene oxide to graphene, and at the same time dope iodine into graphite In ene, adjust the layer spacing of graphene;

[0033] S5 washing the obtained product several times with deionized water, removing excess salt therein, and freeze-drying to obtain iodine-doped grap...

Embodiment 1

[0035] Example 1: Weigh 0.375 g of sodium iodide and dissolve it in 28 ml of deionized water, then add 12 ml of graphene oxide suspension (4.2 mg ml-1) into the solution, ultrasonicate for 5 min, and mix The solution was transferred to a 50 ml polytetrafluoroethylene liner autoclave, and reacted at 180 °C for 12 h. The resulting product was washed several times with deionized water to remove excess salt, and then freeze-dried to obtain iodine-doped composites of graphene. For the scanning electron microscope image of the prepared doped graphene, please refer to figure 1 , it can be seen from the figure that the iodine-doped graphene is relatively loose.

Embodiment 2

[0036] Example 2: Weigh 0.75 g of sodium iodide and dissolve it in 28 ml of deionized water, then add 12 ml of graphene oxide suspension (4.2 mg ml-1) into the solution, ultrasonicate for 5 min, and mix The solution was transferred to a 50 ml polytetrafluoroethylene liner autoclave, and reacted at 180 °C for 12 h. The resulting product was washed several times with deionized water to remove excess salt, and then freeze-dried to obtain iodine-doped composites of graphene. For the scanning electron microscope image of the prepared doped graphene, please refer to figure 2 , it can be seen from the figure that the iodine-doped graphene is relatively loose and wrinkled.

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Abstract

The invention discloses a preparation method of iodine-doped graphene. The preparation method comprises the following steps of S1, dissolving an iodine source into deionized water to prepare a solution I with certain concentration; S2, preparing a graphene oxide turbid liquid with certain concentration, adding the turbid liquid into the solution I, and mixing uniformly to form a mixed liquid II; S3, performing ultrasonic wave processing on the mixed liquid II for 3-6min; S4, transferring to a high-pressure reaction kettle to perform a hydrothermal reaction at a temperature of 150-200 DEG C for 10-14h, reducing the graphene oxide into graphene while doping iodine into the graphene, and regulating and controlling the interlayer spacing of the graphene; and S5, washing the obtained product by deionized water for many times for removing redundant salt, and freezing and drying to obtain the iodine-doped graphene. By adoption of the preparation method of the iodine-doped graphene provided by the invention, regulation and control on the interlayer spacing of the reduction-oxidation graphene is realized through iodine doping, and an iodine-doped graphene material with proper interlayer spacing and conductivity is obtained. The invention also discloses an application of the iodine-doped graphene in a lithium battery.

Description

technical field [0001] The invention relates to the technical field of materials, in particular to a preparation method of iodine-doped graphene and the application of iodine-doped graphene in battery materials. Background technique [0002] Lithium-ion batteries are considered to be one of the most promising energy storage devices due to their high energy density, long service life, and environmental friendliness. After more than 20 years of development, lithium-ion batteries have become an indispensable energy storage device in people's lives, and are widely used in mobile communication equipment, notebook computers, digital cameras, electric vehicles, energy storage power stations, power tools and other fields. The negative electrode is an important part of lithium-ion batteries. Therefore, preparing excellent anode materials is of great significance for lithium-ion batteries. In the negative electrode materials of lithium-ion batteries, although metal oxides and nano-s...

Claims

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Application Information

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IPC IPC(8): H01M4/587H01M4/133H01M10/0525H01M10/058
CPCH01M4/133H01M4/587H01M10/0525H01M10/058Y02E60/10Y02P70/50
Inventor 陈绍华李长明陈杰
Owner 深圳市陆星智农科技有限公司
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