Patent ID: 11923139
Assignee: ENI S.P.A.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  Y | IPC H

Claim 17:
18. An electric energy storage device comprising:
current collector elements, wherein each current collector element comprises a metallic base having at least one surface covered with an active material, the active material having a graphene matrix and a polymeric binder that is a non-aqueous- processing based binder and is able to sustain temperature up to 200° C. without degradation, wherein the graphene matrix is modified or doped with transition metal dichalcogenides, which comprise one or more transition metal compounds;
wherein the graphene matrix is a 3D-multilayer structure that is formed by introducing precursors of the dichalcogenides into graphene oxide to be dispersed in water or into a graphene oxide dispersion in water and then subjecting the dispersion to a hydrothermal treatment;
wherein the device is filled with a non-aqueous electrolyte composition so that the graphene matrix is in contact with the non-aqueous electrolyte composition; wherein the non-aqueous electrolyte composition comprises cations and anions in a liquid medium comprising high boiling temperature solvents and ionic liquids; and wherein the high boiling solvents that are selected do not undergo a change to a gaseous state at normal atmospheric pressure and at a temperature of at least 150° C.