| abstract |
The invention relates to an accumulator with a bipolar architecture that comprises two terminal current collectors, between which a stack of n electrochemical cells is disposed, with n being an integer at least equal to 2, wherein: - each electrochemical cell comprises a positive electrode, a negative electrode and an ion conducting membrane that is interposed between the positive electrode and the negative electrode and comprises a liquid electrolyte included in the electrodes and the ion conducting membrane; - the n electrochemical cells are separated from each other by n-1 bipolar current collectors; and which is characterised in that the positive electrode and the negative electrode of each electrochemical cell are gel electrodes comprising a composite material comprising a polymeric matrix made of at least one gelling polymer (FF), an active electrode material and optionally one or more electronic conductive additives, the polymeric matrix trapping the liquid electrolyte, the one or more gelling polymers (FF) being selected from fluorinated polymers comprising at least one repetitive unit derived from the polymerisation of a fluorinated monomer and at least one repetitive unit derived from the polymerisation of a monomer comprising at least one carboxylic acid group, optionally in the form of a salt. Applications: any field where accumulators with a bipolar architecture are likely to be used and, in particular, in the production of electric or hybrid vehicles, of devices for stationary storage of energy and of portable electronic devices (telephones, touch tablets, computers, cameras, camcorders, etc.). |