Actually, we have pretend to develop supercaps and batteries with high densities of power and energy which will accept to work under an important number of charge-discharge cycleswihout loosing of capacity (many possibilities to be reused). For the development of supercaps, we successfully conducted the preparation of electrodes with new formulations of materials that will allow obtaining high specific capacities and high electric conductivities for which we have used nanostructured carbonaceous materials (graphene, carbon nanotubes, and carbon nanofibres) and we have developed new methodologies in the preparation of those electrodes. Regarding to the batteries we have successfully achieved the preparation of electrodes (anodes and cathodes) using formulation of materials who will ensure high electric conductivities, high capacities of Litio ions intercalation and perfect chemical and structural stability. For this purpose, we have used conductive additives based on carbon (black carbons, graphene, carbon nanotubes) and active materials based on graphite and silicon naoparticles resting on graphite. Using developed electrodes that are more appropriate, we have assembled a first prototype of ion-Litio battery, which later has been validated for its electrochemical characterization.
During the project, AIJU has been able to prepare electrodes of supercaps with new nanomaterials formulations that have shown high specific capacities with traditional organic electrolyte (140 F/g) and very low electric resistances. Thanks to the optimization of formulation of those electrodes, we have been able to assemble a prototype of supercap with a low impedance (ESR), a high-power density (0,67Kw/Kg) and moderate energy density (21 kW.h/Kg), able to offer a maximum power of 8 KW/Kg. About the ion-Litio batteries, it was possible to develop electrodes (anodes and cathodes) with specific capacities close to theorics of sufficiently low current, drastically reducing those that increase the current. We noted that adding small quantities of black carbons and carbon nanotubes to electodes significantly improved the reaction of electrodes to high current. Adding silicon to electrodes improves substantially their storage capacity but their life-time is deteriorated because of their reduced structural stability.
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