New devices
The hybridization of a battery with a supercapacitor is done by choosing the most interesting characteristics of the two types of systems. For example, the design of carbon / PbO2 systems allows the lead electrode of a conventional battery to be replaced by an activated carbon electrode that has good durability and high power density, coupled with the high capacity of The lead dioxide electrode. It is thus possible to decline astute couplings in aqueous or organic media in order to realize efficient hybrid systems. This line of research currently integrates the materials developed by the team in partnership projects with Canada or Poland (Li-ion capacitor).
The new devices are also at the heart of the group's research work through storage microsystems (ANR ISICAP and MECHANANO project). The original hybridisation of a fuel cell by supercapacitors integrated into the pile is under way (ANR SuperCapac project).
Theme: Flexcap supercapacitive device (ANR "Flexcap" project)
The objective is to develop a new type of flexible supercapacitors with possible integrability in clothes to supply nomadic electronic equipment (firemen, infantry) such as: flash lamp, distress beacon, digital display, defibrillator, laptop, camera, transmitter Radio, or sharpening equipment in horticulture (secateurs). The technical specifications for the targeted performance are 100F / g per electrode and 0.5F / cm2 for the complete device, with an operating voltage of 1.6V (aqueous) and 2.6V (organic) for a 10x10 cm2 based on carbon supports modified by metal oxides and a gelled electrolyte.
Flexible supercapacitor
Theme: Supercapacity based on nanostructured silicon (ANR "ISICAP" project)
The CEA-INAC of Grenoble, the IMN and the Solvionic company are collaborating with the aim of developing and studying new micro-supercapacitors, all solids directly integrated on a chip. Nanostructured silicon electrodes are combined with a solid electrolyte consisting of ionic liquid confined in a nanoporous silica matrix.
Nano-silicon and ionogel
Theme: microstorage of power and energy for communicating nanostructured autonomous sensors (ANR "Mecanano" project)
This project aims to develop micro-devices for power and power storage for communicating autonomous microsensors. The Institute of Electronics, Microelectronics and Nanotechnology (IEMN) and the Institute of Materials Jean Rouxel (IMN) deploy a 3D topology as a common foundation for the development of 4 different types of microdevice storage, metal- Insulation-metal to lithium ion battery.
The use of 3D substrates (micro-pillars) makes it possible to increase the area on which the active material can be deposited, thus implying an increase in capacity. The production of a negative electrode of Fe3O4 coupled to a positive electrode of MnO2 makes it possible to increase the range of potential of use of the supercapacitor. The deposition technique used for magnetite is electrodeposition.
SEM image of 3D topology (silicon pillars) and magnetite deposit
Increased capacity of a supercapacitor electrode
Manganese dioxide based on 3D topology
Références
Thissandier, F., Gentile, P., Pauc, N., Hadji, E., Comte, A.L., Crosnier, O., Bidan, G., Sadki, S., Brousse, T., Highly n-doped silicon nanowires as a possible alternative to carbon for on-chip electrochemical capacitors (2013) Electrochemistry, 81 (10), pp. 777-782.
Thissandier, F., Pauc, N., Brousse, T., Gentile, P., Sadki, S., Micro-ultracapacitors with highly doped silicon nanowires electrodes (2013) Nanoscale Research Letters, 8 (1), pp. 1-5.
Brousse, T., Bélanger, D., Guay, D., Asymmetric and Hybrid devices in Aqueous Electrolytes (2013) Supercapacitors: Materials, Systems, and Applications, pp. 257-288.
Eustache, E., Frappier, R., Porto, R.L., Bouhtiyya, S., Pierson, J.-F., Brousse, T., Asymmetric electrochemical capacitor microdevice designed with vanadium nitride and nickel oxide thin film electrodes (2013) Electrochemistry Communications, 28, pp. 104-106.
Thissandier, F., Le Comte, A., Crosnier, O., Gentile, P., Bidan, G., Hadji, E., Brousse, T., Sadki, S., Highly doped silicon nanowires based electrodes for micro-electrochemical capacitor applications (2012) Electrochemistry Communications, 25 (1), pp. 109-111.
Hamel, C., Brousse, T., B́langer, D., Guay, D., Effect of ball-milling on the physical and electrochemical properties of PbO2 and PbO2/BaSO4 nanocomposite (2012) Journal of the Electrochemical Society, 159 (1), pp. A60-A67.
Perret, P., Khani, Z., Brousse, T., Bélanger, D., Guay, D., Carbon/PbO2 asymmetric electrochemical capacitor based on methanesulfonic acid electrolyte (2011) Electrochimica Acta, 56 (24), pp. 8122-8128.