Preparation method of graphene oxide coated lithium salt

A graphene coating and graphene technology, applied in the field of composite material preparation, can solve the problems such as inability to effectively separate graphene oxide sheets, affecting lithium ion intercalation and deintercalation efficiency, not considering effective effects, etc., so as to increase the surface area, No material loss, improved charge and discharge performance

Active Publication Date: 2014-04-09
GUANGXI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The coating method has the problem of poor uniformity of dispersion and coating, and does not consider the effective effect of using more functional groups of graphene oxide on coating, and cannot effectively separate graphene oxide sheets, and the temperature drops sharply after high temperature heating. The change makes the graphene coating too tight, which affects the efficiency of lithium ion intercalation and extraction.

Method used

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  • Preparation method of graphene oxide coated lithium salt
  • Preparation method of graphene oxide coated lithium salt
  • Preparation method of graphene oxide coated lithium salt

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 1. Preparation of graphene oxide suspension: adding 0.5% graphene oxide by weight into absolute ethanol and stirring evenly, and then performing ultrasonic treatment;

[0025] 2. Add 3% polyethylene glycol by weight into the N-methylpyrrolidone solution, stir to dissolve, and obtain solution A;

[0026] 3. Add lithium salt into solution A, stir to disperse, and obtain solution B;

[0027] 4. Take the graphene oxide suspension and add it to solution B. The volume ratio of the suspension to solution B is 1:1.5. Stir evenly and heat to a temperature of 70°C. Keep the temperature and evaporate the solution to obtain a wet solid. The wet solid is in Dry at room temperature.

Embodiment 2

[0029] 1. Preparation of graphene oxide suspension: adding 5% graphene oxide by weight into absolute ethanol and stirring evenly, and then performing ultrasonic treatment;

[0030] 2. Add polyethylene glycol with a weight percentage of 20% into the N-methylpyrrolidone solution, stir, and heat the solution system during the stirring process. The temperature is controlled at 30°C, the polyethylene glycol is dissolved, and cooled to room temperature to obtain a solution A;

[0031] 3. Add lithium salt into solution A, stir to disperse, and obtain solution B;

[0032] 4. Take the graphene oxide suspension and add it to solution B. The volume ratio of the suspension to solution B is 1:2.5. Stir evenly and heat to a temperature of 100°C. Keep the temperature and evaporate the solution to obtain a wet solid. The wet solid is in Dry at room temperature.

[0033]

Embodiment 3

[0035] 1. Preparation of graphene oxide suspension: adding 3% graphene oxide by weight into absolute ethanol and stirring evenly, and then performing ultrasonic treatment;

[0036] 2. Add polyethylene glycol with a weight percentage of 10% into the N-methylpyrrolidone solution, stir, heat the solution system during the stirring process, control the temperature at 70°C, dissolve the polyethylene glycol, and cool to room temperature to obtain a solution A;

[0037] 3. Add lithium salt into solution A, stir to disperse, and obtain solution B;

[0038] 4. Take the graphene oxide suspension and add it to solution B. The volume ratio of the suspension to solution B is 1:1.8. Stir evenly and heat to a temperature of 90°C. Keep the temperature and evaporate the solution to obtain a wet solid. The wet solid is in Dry at room temperature.

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Abstract

The invention relates to a preparation method of graphene oxide coated lithium salt. The preparation method comprises the following operation steps: A. adding 3-20 percent by mass of polyethylene glycol to an N-methyl pyrrolidone solution, and stirring so as to dissolve the polyethylene glycol, thus obtaining a solution A; B. adding lithium salt to the solution A, and stirring so as to disperse the lithium salt, thus obtaining a solution B; C. mixing absolute ethyl alcohol suspension liquid with uniformly dispersed graphene oxide ( the mass percent of soluble solids is 0.5%-5%) and the solution B, wherein the usage amount ratio of the suspension liquid to the solution is 1: (1-2.5), uniformly stirring, heating to 70-100 DEG C, keeping the temperature, evaporating the solution so as to obtain humid solid, and drying the humid solid at a normal temperature, thus obtaining the graphene oxide coated lithium salt. Compared with other coating means, the preparation method has the advantages that the method is energy-saving and environmentally friendly, the special process is not needed, the material lost is avoided, and the industrial production of the graphene oxide coated lithium salt is easy.

Description

technical field [0001] The invention relates to a preparation method of a composite material, in particular to a preparation method of graphene oxide-coated lithium salt. Background technique [0002] Graphene has a two-dimensional lattice structure, and the carbon atoms in the plane are sp 2 The hybrid orbitals are connected to form a hexagonal lattice structure, that is, the carbon atoms are connected to the adjacent three carbon atoms through strong σ bonds, and the C-C bonds make graphene have good structural rigidity; the remaining one p electron orbital is vertical On the graphene plane, it forms π bonds with the surrounding atoms, and the delocalization of π electrons in the lattice makes graphene have good electrical conductivity. The electron mobility on the plane at room temperature is 1.5×104cm 2 / V s, far exceeds the conduction rate of electrons in general conductors, so it has a broad potential application space in microelectronics, aerospace military industry,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505
CPCY02E60/122H01M4/366H01M4/505H01M4/62H01M4/625H01M10/0525Y02E60/10
Inventor 梁兴华刘于斯刘天骄华晓鸣史琳曾帅波叶超超宋清清刘浩刘大玉蓝凌霄
Owner GUANGXI UNIVERSITY OF TECHNOLOGY
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