Blanc Inter SIMI 9 - Blanc international - Sciences de l'information, de la matière et de l'ingénierie : Sciences de l'ingénierie, matériaux, procédés, énergie

Synthesis of the carbon nanotubes/graphene hybrid architectures et their applications in Lithium ion battery and multifunctional composites – Synapp

Submission summary

Graphene is a single layer of carbon atoms tightly packed into honeycomb-like structure. It is a basic building unit for graphitic materials of all other dimensionalities. Graphene has high values of Young’s modulus (~1100 GPa), fracture strength (125 GPa), thermal conductivity (~5000 W m-1K-1), mobility of charge carriers (200000 cm2 V-1 s-1) and specifc surface area (calculated value, 2630 m2 g-1). Graphene nanosheets (<10 layers) (GNs) have similar properties as graphene and can be more easily produced than graphene. This point is very attractive for the large scale industry oriented research.
Applications about GNs in multifunctional composite materials and energy storage have been reported. In spite of the exceptional properties and promising applications in multifunctional composites, there are still a lot of problems which limit the effects of GNs in composite materials. One of the main problems is that GNs are easy to aggregate and even restack into graphite when they are used in composites. Therefore, several methods are developed to prevent GNs aggregating and increase effective interface in composites. However, the high-degree covalent functionalization of the GNs surface can significantly damage or even destroy the GN’s intrinsic properties. Some investigations indicated that loading certain nanoparticles (Au, Pt, CdS, Ag, etc.) on GNs can effectively diminish the interaction between them and facilitate the dispersing, but nanoparticles on GNs may give an opposite effect or high massive content when this nanoparticles/graphene hybrid is applied to composite materials.
There is a real need to find a solution that allows using the advantages of the GNs and CNTs (carbon nanotubes) but not be troubled by the difficulties and overcharges in production.
In this project, we will develop a CNTs/GNs hybrid structure which can prevent GNs aggregating or restacking and improve effective interface in composites. The structure parameters of CNTs/GNs hybrid can be tuned by controlling experimental conditions. Then, this hybrid structure will be applied to composite materials, and the electrochemical, mechanical, thermal and electronic properties of composites will be investigated in details in comparable situations with other adding materials already used such as CNTs or graphene alone.
It should be emphasized that the hybrid CNTs/GNs architecture proposed in the project is not the simple mechanical mixed GNs plus CNTs. Our idea is to obtain such hybrids directly from CVD (Chemical vapor deposition) synthesis by growing CNTs on the GNs as substrates. Two ways are planed, one by Chinese partner NWU to impregnate the GNs with catalysts solution then CVD growth of CNTs while another by French partner LMSSMAT using spray method to introduce the catalysts and carbon source in-situ. The efficiency and obtained hybrids will be characterized and compared to understand the mechanisms of growth and to optimize the conditions.
CNTs/GNs hybrid is a new structure and its synthesis is not yet reported in the literature, and its application in composites is also in blank. New particularly innovative applications as electrodes in solid-electrolytic-supercapacitors or like compliant electrodes for electromechanical transducers based on electroactive polymers can be reasonably considered. A good control of conductivity in these composites would make it possible to also use them like high permittivity (high k) insulating in these same applications. To summary, CNTs/GNs hybrid and its application in LIBs or other composites will bring potential and significant economic benefit.

Project coordination

Hui WANG (Shaanxi Key Laboratory of Physico-Inorganic Chemistry, Northwest University)

The author of this summary is the project coordinator, who is responsible for the content of this summary. The ANR declines any responsibility as for its contents.

Partner

NWU Shaanxi Key Laboratory of Physico-Inorganic Chemistry, Northwest University
LMSSMAT CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE - DELEGATION REGIONALE ILE-DE-FRANCE SECTEUR OUEST ET NORD
G2Elab CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE - DELEGATION REGIONALE RHONE-ALPES SECTEUR ALPES

Help of the ANR 204,700 euros
Beginning and duration of the scientific project: - 36 Months

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