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Preparation method of graphene-based composite material
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A composite material and graphene-based technology, applied in the direction of non-aqueous electrolyte battery electrodes, electrical components, battery electrodes, etc., can solve the problems of waste of resources, etc., and achieve the effect of simple method, effective reuse, and low preparation temperature
Active Publication Date: 2016-08-10
SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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[0007] However, these existing technologies only achieve the purpose of desulfurization, but do not really realize the effective reuse of sulfur, thus causing a waste of resources
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Embodiment 1
[0019] see figure 1 , Embodiment 1 of the present invention provides a kind of preparation method of powdery graphene-based composite material, and this method comprises the following steps:
[0020] S1: Provide graphene oxide dispersion;
[0021] S2: passing hydrogen sulfide gas, reducing the graphene oxide to graphene, and obtaining a sulfur-loaded graphene dispersion; and
[0022] S3: Drying the sulfur-loaded graphene dispersion.
[0023] In step S1, the solvent in the graphene oxide dispersion can be water, or ethanol, isopropanol, ethylene glycol, N,N-dimethylformamide (DMF), N-methylpyrrolidone ( NMP), one or more of tetrahydrofuran. Of course, the choice of the solvent is not limited to the ones listed above, as long as it can well disperse the graphene oxide. The mass percent concentration of the graphene oxide dispersion is 0.05-30 mg / mL, preferably, the concentration is 1-5 mg / mL.
[0024] The preparation method of the graphene oxide dispersion is as follows: We...
Embodiment 2
[0030] see figure 2 , Embodiment 2 of the present invention provides a method for preparing a film-shaped positive electrode material, the method comprising the following steps:
[0031] S1: Provide graphene oxide dispersion;
[0032] S2: Passing hydrogen sulfide gas, reducing the graphene oxide to graphene, and obtaining a sulfur-loaded graphene dispersion;
[0033] S3: filtering the sulfur-loaded graphene dispersion to obtain a film material; and
[0035] In step S1, the solvent in the graphene oxide dispersion can be water, or ethanol, isopropanol, ethylene glycol, N,N-dimethylformamide (DMF), N-methylpyrrolidone ( NMP), one or more of tetrahydrofuran. Of course, the choice of the solvent is not limited to the ones listed above, as long as it can well disperse the graphene oxide. The mass percent concentration of the graphene oxide dispersion is 0.05-30 mg / mL, preferably, the concentration is 1-5 mg / mL.
[0036] The preparation ...
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Abstract
The invention provides a preparation method of a graphene-based composite material. The preparation method comprises the following steps: providing a grapheneoxide dispersion liquor; introducing hydrogensulfide gas to reduce the grapheneoxide into graphene and further to obtain a sulfur-loading graphene dispersion liquor; and drying the sulfur-loading graphene dispersion liquor. The invention also provides a preparation method of another graphene-based composite material. The preparation method comprises the following steps: providing a graphene oxide dispersion liquor; introducing hydrogensulfide gas to reduce the graphene oxide into graphene and further to obtain a sulfur-loading graphene dispersion liquor; filtering the sulfur-loading graphene dispersion liquor to obtain a film material; and drying the film material. The preparation method is simple, the preparation condition is mild, and at the same time the preparation method is capable of solving problems of removal of the industrial exhaust gashydrogensulfide and effective recycle of sulfur.
Description
technical field [0001] The invention relates to a preparation method of a graphene-based composite material, in particular to a preparation method of a graphene-based composite material used in lithium-sulfur battery cathode materials. Background technique [0002] In today's society, energy shortage and environmental pollution are two major challenges facing mankind. [0003] On the one hand, since its discovery in 2004, graphene has attracted widespread attention because of its unique structure and physicochemical properties. The perfect graphene is a one-atom-thick two-dimensional crystal composed of six-membered rings in a honeycomb structure, and is considered to be the basic structural unit for building other carbonaceous materials. Graphene has strong chemical stability; its strength is the highest among known test materials, more than 100 times that of steel; it has a large specific surface area and is a real surface solid; it has excellent electrical and thermal co...
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