DS0205 - Stockage, gestion et intégration dans les réseaux des énergies

Improving the volumetric energy density of supercapacitors – IVEDS

Submission summary

This proposal aims to address a major issue for the energy storage, management and integration in the grid, addressed in the “Clean, Safe and Efficient Energy” challenge (#2), especially on the “improvement of the safety and energy density of supercapacitors” (Research theme #5). IVEDS is based on the design of safe and high volumetric energy electrochemical capacitors and the concomitant benchmarking of various asymmetric devices. Our final goal is to increase by 50% the volumetric energy density of nowadays symmetrical carbon ECs, i.e from 7 to 11 Wh/L, while keeping the power density close to that of state of the art devices (7.5 kW/L usable volumetric power).
To reach this target, we propose to substitute conventional carbon based electrodes by high density multication oxides (>5 g/cm3) showing high pseudocapacitance (> 100 F/g), fair cycle life (>100000 cycles) in safe aqueous based electrolytes. These new oxides (task 2) will be based on active metal cations showing multiple oxidation states and lying in a specific crystallographic site that favors its pseudocapacitive rather than Faradaic behavior in aqueous based electrolytes. They will be synthesized with 10-100 m2/g specific surface area. Among all the synthesized compounds, two of the most performing chemistries will be selected and will be used as active materials in a high power electrode formulation including carbon-based nanocomposites (task 3). Two generations of advanced architecture/formulation will be provided for prototyping (18650 format cells), including the preparation of slurries for casting the electrodes, the winding of electrodes and separator for the cell manufacturing that will be implemented in a polymer casing prior to be tested (task 4). 500 F prototype cells are expected from this task.
Three key players in the field of supercapacitors (IMN, ICG) and benchmarking of lithium-ion batteries (LRCS) are gathering together in this innovative project which will target a change of paradigm from carbons to oxides for large-scale applications of supercapacitors where volumetric energy density and safety are the most important parameters. This consortium will take benefit from its belonging to the French Network on Energy Storage (RS2E - www.energie-rs2e.com/fr).
The project is expected to provide basic knowledge on the role of solid state chemistry on the electrochemical performance of oxides as supercapacitor electrodes, focusing on the crystallographic nature of the synthesized phases, as well as on the influence of "spectator" cations. This fundamental research will be used to implement more applied research based on the preparation of nanocomposite electrodes that adequately combines the active material to a high electronically and ionically conductive architecture based on carbons. This will demonstrate how an attractive oxide can be turned into a performing electrode. Again, some fundamental results are expected from this step and will give new insights on the synergies between carbon and oxides. Finally, the selection of chemistries and architecture/formulation will be done by the three partners in order to push the project from its fundamental side to a more applied field. Formulation of oxide based electrodes for casting onto stainless steel current collectors and integration in industrial prototypes has been poorly investigated up to now. It will provide valuable data both for researchers who hardly feature how their new materials behave at a cell scale, and for potential users who might like to know what can be expected from oxide based electrodes in a real cell. This comes together with a strategy for dissemination of the results to different potential industrial partners, from materials manufacturers to end-users.

Project coordination

Thierry BROUSSE (Institut des Matériaux Jean Rouxel)

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

IMN Institut des Matériaux Jean Rouxel
ICG Institut Charles Gerhardt Montpellier
LRCS Laboratoire de Réactivité et de Chimie des Solides

Help of the ANR 553,313 euros
Beginning and duration of the scientific project: September 2015 - 42 Months

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