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Method for producing a semiconductor or conductir material, and use thereof

A conductor material, semiconductor technology, applied in nano-carbon, graphene, electrolytic components and other directions

Active Publication Date: 2019-12-27
SIXONIA TECH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Disadvantageously, the yield of exfoliated graphene is only 5 to 8 m% of the graphite used

Method used

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  • Method for producing a semiconductor or conductir material, and use thereof
  • Method for producing a semiconductor or conductir material, and use thereof
  • Method for producing a semiconductor or conductir material, and use thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0100] Graphene exfoliation was performed with an electrode pair consisting of two graphite foils (1.5*5 cm, 100 mg each foil) (Alfa Aesar).

[0101] The electrodes of the electrode pair were arranged in parallel at a fixed distance of 1.5 cm. An electrolyte solution was prepared by dissolving tetrabutylammonium bisulfate powder in deionized water (0.1 M, 1.7 g of salt in 50 ml of water). The pH of the electrolyte solution was adjusted to 7 with NaOH. An alternating current with an operating voltage of + / −10 V and a frequency of 0.1 Hz was applied in order to dissociate the graphene layer. The orientation of the anode operating voltage was changed every 5 s from positive to negative and vice versa. To prevent overheating of the electrolytic cell, it was cooled in an ice bath throughout the exfoliation process.

[0102]The graphene suspended in the electrolyte solution was separated off by means of a 0.2 μm PTFE membrane filter and washed three times with water and three tim...

Embodiment 2

[0105] In order to prepare graphene on a larger scale, five electrode pairs formed of graphite foils (6*12 cm, 1.02 g each foil) were connected in series with a distance of 2 cm between each electrode pair.

[0106] Electrolysis was performed under the same conditions as detailed in Example 1. However, 1000 ml of electrolyte solution (34 g tetrabutylammonium bisulfate in 1000 ml deionized water) with a concentration of 0.1 M was used. The stripping ends automatically when the graphite material has been consumed.

[0107] The graphene suspended in the electrolyte solution was separated off by means of a 0.2 μm PTFE membrane filter and washed three times with water and three times with ethanol in order to remove electrolyte residues. 5.5 g of graphene was produced in 15 min.

[0108] The graphene powder is subsequently dispersed in N,N-dimethylformamide in an ultrasonic bath and can be stored or further used as such. To this end, 120 mg of graphene were dispersed in 1 L of DM...

Embodiment 3

[0130] To illustrate the potential of graphene prepared according to the present invention for use in battery applications, a commercially available cathode material (LiFePO4 powder, 20 mg, particle size 4 The (EG-LFP) particles were filtered off and dried in an oven at 100°C overnight.

[0131] The EG-LFP working electrode was prepared by mixing EG-LFP, activated carbon (super-P), and polyvinylidene fluoride (PVDF) at a mass ratio of 80:10:10. The mixture was applied to aluminum foil, dried and punched out into circular cells (Zellen) with a diameter of 10 mm. It was dried under vacuum at 80° C. for 12 hours.

[0132] A coin cell of type CR 2032 was assembled under an inert atmosphere with lithium foil (Sigma Aldrich) as the counter electrode and polypropylene as the separator. The electrolyte was prepared from 1 M LiPF6 in ethylene carbonate / diethyl carbonate (3:7 v / v with 2m% ethylene carbonate) and used to fill the battery. Load the EG-LFP working electrode.

[0133] Al...

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Abstract

The invention relates to a method for producing a semiconductor or conductor material from a two-dimensionally layered structured base material by means of electrolytic exfoliation in an electrolysiscell, comprising at least one electrode pair made of a first and second electrode, and an electrolyte solution containing at least one dissolved salt and / or sulphuric acid, wherein at least one of theelectrodes of the electrode pair contains the two-dimensionally layered structured base material, wherein the salt is chosen from tetraalkylammonium salts, and wherein, during the electrolysis, the polarity of the first and second electrode is reversed periodically, wherein the reversal of the polarity of the electrodes is carried out by applying an alternating current.

Description

technical field [0001] The subject of the present invention is a method for producing a semiconducting or conducting material consisting of a single layer or having a layered structure by electrolytic exfoliation and its use. Background technique [0002] The separation of individual layers of two-dimensionally structured or layered semiconductor or conductor materials has been of interest since several years, not least because the use of these materials in electronic components leads to enormous power gains and efficient applications. [0003] An example of separated layers of such a two-dimensionally structured or layered material is graphene, which is a monolayer, i.e., individual, only one atomic layer thick of graphite (a natural form of carbon in its pure form). Existing representation) layer. However, graphene also refers to a material in which several such single layers are arranged in layers on top of each other. [0004] Graphene can be understood as a two-dimens...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B1/00C01B32/19
CPCC25B1/00C01B32/19
Inventor M·洛赫冯新良盛扬
Owner SIXONIA TECH GMBH
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