Flexible electrode-separator elements and processes for their preparation
AssigneesHydro-Quebec, Transfert Plus, S.E.C.
InventorsNicolas Delaporte, Diby Benjamin Ossonon, Karim Zaghib, Daniel Belanger
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Abstract
This application describes a process for the preparation of flexible electrode-separator elements or assemblies, which includes the application of an electrode material on the separator. The electrode material comprises graphene, for instance produced by graphite exfoliation. The electrode-separator elements obtained by the process as well as their use in electrochemical cells are also described.
Claims26
A process for producing a flexible electrode-separator element comprising a self-standing electrode material comprising graphene, the electrode material being on a surface of a separator, wherein no current collector is required, the process comprising the steps of:
- a) mixing a graphene powder and an electrochemically active material with a solvent to form a suspension;
- b) applying the suspension obtained in a) on the separator to obtain an electrode material layer on the surface of the separator, wherein the electrode material layer comprises at least 10 wt % of graphene and is free of a binder;
- and
- c) removing the solvent to obtain the flexible electrode-separator element, wherein steps (b) and (c) comprise steps of filtering the suspension obtained in (a) through the separator to obtain a layer of the electrode material on the surface of the separator, thereby obtaining the electrode-separator element.
A flexible electrode-separator element comprising a self-standing electrode material comprising a graphene powder and an electrochemically active material on a separator, the electrode material being free of binder and comprising at least 10 wt % of graphene.
Dependencies are inferred from the claim text.