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A method for preparing single-layer graphene based on electrolyte solvent hot insertion lithium exfoliation

A single-layer graphene and electrolyte technology, applied in the direction of single-layer graphene, graphene, nanotechnology for materials and surface science, etc., can solve the problem that the limited specific surface area of ​​graphene nanomaterials affects the application and development of graphene , complex preparation methods, etc.

Active Publication Date: 2020-02-07
FUZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] To sum up, most of the synthetic graphene methods mentioned in the literature or patents have obtained graphene nanosheets to a certain extent, improving their electrochemical performance, thereby affecting the application and development of graphene in lithium batteries.
At the same time, the preparation methods of graphene nanosheets in the current patents are relatively complicated, and the prepared graphene nanomaterials have limited specific surface area and poor conductivity, which have limited effect on improving its lithium storage performance.

Method used

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  • A method for preparing single-layer graphene based on electrolyte solvent hot insertion lithium exfoliation
  • A method for preparing single-layer graphene based on electrolyte solvent hot insertion lithium exfoliation
  • A method for preparing single-layer graphene based on electrolyte solvent hot insertion lithium exfoliation

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Effect test

Embodiment 1

[0025] (1) In a glove box under the protection of high-purity argon, weigh 0.1g of graphite, add it to a 30ml polytetrafluoroethylene reactor, and then measure 15ml of electrolyte with a concentration of 1mol / L LiPF 6 , transfer it to the polytetrafluoroethylene equipped with graphite, and then stir it by magnetic force for 30 minutes to form a uniformly distributed suspension, seal it well, and obtain the precursor mixed solution, figure 1 It is a block graphite structure;

[0026] (2) Transfer the 30ml reaction kettle to a blast drying oven, and conduct a solvothermal reaction at 100°C for 24 hours. After it cools down naturally, transfer the mixed solution to a beaker, add 30ml of n-hexane to it, and then pass Centrifuge in a 50ml centrifuge tube at a centrifugation rate of 8000r / min and a centrifugation time of 30min. After centrifugation, use n-hexane again to wash several times in the same way to remove excess electrolyte solution. After the washing is completed, a singl...

Embodiment 2

[0029] (1) In a glove box under the protection of high-purity argon, weigh 0.15g of graphite, add it to a 30ml polytetrafluoroethylene reactor, and then measure 20ml of electrolyte with a concentration of 1mol / L LiPF 6 , transfer it to the polytetrafluoroethylene equipped with graphite, and then stir it by magnetic force for 30min to form a uniform suspension, then seal it well to obtain the precursor mixture, figure 1 It is a block graphite structure;

[0030] (2) Transfer the 30ml reaction kettle to a blast drying oven, and conduct a solvothermal reaction at 120°C for 48 hours. After it cools down naturally, transfer the mixed solution to a beaker, add 30ml of n-hexane to it, and pass Centrifuge in a 50ml centrifuge tube at a centrifugation rate of 8000r / min and a centrifugation time of 30min. After centrifugation, use n-hexane to wash several times in the same way to remove excess electrolyte solution. After washing, a single layer of lithium intercalation is obtained. gra...

Embodiment 3

[0033] (1) In a glove box under the protection of high-purity argon, weigh 0.2g of graphite, add it to a 30ml polytetrafluoroethylene reactor, and then measure 25ml of electrolyte with a concentration of 1mol / L LiPF 6 , transfer it to the polytetrafluoroethylene liner equipped with graphite, and then stir it by magnetic force for 30 minutes to obtain a uniformly mixed suspension, seal it well, and obtain the precursor mixed solution, figure 1 It is a block graphite structure;

[0034] (2) Transfer the 30ml reaction kettle to a blast drying oven, and conduct a solvothermal reaction at 120°C for 72 hours. After it cools down naturally, transfer the mixed solution to a beaker, add 30ml of n-hexane to it, and pass Centrifuge in a 50ml centrifuge tube with a centrifugation rate of 8000r / min and a centrifugation time of 30min. After centrifugation, use n-hexane to wash several times in the same way to remove excess electrolyte solution. After the washing is completed, a single layer...

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Abstract

The invention discloses a method for preparing single-layer graphene by lithium-inserting stripping based on electrolyte solvent thermal. According to a graphene nano material with the single-layer structure, the single-layer graphene is prepared through the solvent thermal by using graphite as a precursor and using 1 mol / L of electrolyte as a solvent. The method mainly comprises the following steps: under the protection of high-purity argon, embedding lithium ions in the LiPF6 electrolyte between the graphitic layers through the solvent thermal method, so as to obtain a lithium-embedded single-layer graphene material, and washing by normal hexane and deionized water successively, through processes, such as centrifugal separation, preparing the high-purity graphene nano material with the single-layer structure. The method is capable of using the graphite as the precursor, and preparing the single-layer graphene by using a solvent thermal method. The preparation technology is simple, the cost is low, and the prepared nano material has high specific surface area, good electrical conductivity, structure stability and electrochemistry cycling performance, and has the huge application potential in the field of lithium secondary battery negative electrode materials.

Description

technical field [0001] The invention belongs to the field of new energy nano-energy storage materials, and specifically a method for preparing single-layer graphene based on electrolyte solution solvent hot insertion lithium stripping. Background technique [0002] With the depletion of traditional energy sources, lithium-ion secondary batteries as a representative of new energy sources have received more and more attention. Lithium-ion batteries have significant advantages such as high working voltage, large specific energy, long charge and discharge life, and low self-discharge rate, and there is no environmental pollution problem of cadmium in Cd-Ni batteries. The characteristics of lithium-ion batteries make it possible to develop towards miniaturization, and are suitable for small portable electronic products, such as notebook computers, digital cameras, mobile phones, etc., which are closely connected with indispensable electrical power sources in people's daily life. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/19H01M4/587H01M10/0525B82Y30/00
CPCB82Y30/00C01B2204/02H01M4/587H01M10/0525Y02E60/10
Inventor 杨尊先郭太良艾经伟刘佳慧张余祥胡海龙徐胜陈耿旭李福山林诗敏
Owner FUZHOU UNIV
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