a porous sno 2 Nanosphere/graphene composite material and preparation method thereof
A composite material, graphene technology, applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problem of affecting electrochemical performance, synthetic product structure, morphology is not easy to control, composite structure interface characteristics Complicated and other problems, to achieve the effect of reducing production equipment, tight integration, and short response time
Active Publication Date: 2017-08-11
HEFEI UNIV OF TECH
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Problems solved by technology
The advantage of this method is that the process is relatively simple, the components of the synthesized composite material are closely combined, and the electrochemical performance is good, but the structure and morphology of the synthesized product are not easy to control, especially the interface properties of the composite structure are relatively complex.
Due to the different synthetic strategies adopted, SnO 2 The morphology, size, etc. also present significantly different structural features, which in turn affect their electrochemical performance.
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[0028] Porous SnO of the present invention 2 The specific preparation process of the nanosphere / graphene composite structure material is as follows:
[0029] 1. Prepare graphene oxide by Hummers method: Weigh 2g of 325 mesh natural flake graphite and 46mL of 98% concentrated sulfuric acid in an ice bath, stir evenly; add 6g potassium permanganate into the beaker three times, stir evenly and place Refrigerate in the refrigerator for 96 hours; react at 30-35°C for 2 hours, and stir continuously during this period to promote the oxidation of graphite; add 92mL deionized water to it, and react in a water bath at 95°C for 15 minutes; and add 3% hydrogen peroxide solution dropwise until the solution turns into gold Yellow, filtered by suction; washed 3 times with 1:10 hydrochloric acid; washed with water until the pH rose to 5, ultrasonicated, centrifuged, and dried to obtain graphene oxide.
[0030] 2. Solution preparation: add 30mg graphene oxide into the ethanol / water mixture (3...
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Abstract
The invention discloses a porous SnO2 nano ball / graphene composite material and a preparation method thereof. The porous SnO2 nano ball / graphene composite material is characterized in that firstly natural flake graphite is selected and is in combination with process control to obtain two-dimensional graphene oxide, and then a one-pot method is adopted for synthesizing the porous SnO2 nano ball / graphene composite material with a size being 200nm in situ for the first time under a hydrothermal environment. According to the porous SnO2 nano ball / graphene composite material and the preparation method, the used raw materials are cheap, the operation is easy, equipment is simple, and the industrial production is easy to implement.
Description
[0001] 1. Technical field [0002] The invention belongs to the technical field of functional materials, in particular to porous SnO 2 Preparation of nanosphere / graphene composites. [0003] 2. Background technology [0004] As a two-dimensional planar structure sp 2 Graphene, a hybrid carbon material, has a special layered structure, ultra-high electron mobility, and ultra-large specific surface area, showing good application prospects in many fields. Theoretical calculations show that: as a negative electrode material for lithium batteries, the lithium capacity of multilayer graphene exceeds 1000mAhg -1 , much larger than commercial carbon materials. However, the graphene layers are bonded together by van der Waals force, which is prone to agglomeration during the charging and discharging process, resulting in a particularly fast capacity decay. By combining graphene with electrochemically active materials (such as Sn-based materials, transition metal oxides, etc.), graph...
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IPC IPC(8): H01M4/48H01M4/587H01M4/36B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/364H01M4/48H01M4/587Y02E60/10
Inventor 杨友文张勇程婷马东明高远皓
Owner HEFEI UNIV OF TECH