| 摘要 |
A composite electrochemical cell electrode, comprising a coating of a porous vitreous mineral solid electrolyte network containing an organic polymer solid electrolyte, is new. A composite electrochemical cell electrode comprises a current collector, dispersed electrochemically active material particles, optionally a first electronic conduction additive, a (partially) vitreous mineral solid electrolyte and a solid organic polymer electrolyte. The mineral electrolyte wets the surfaces of the active material, the conduction additive and the current collector form a porous mineral network so that the wetted surface portions are protected by a sealing mineral phase. The polymer electrol is in intimate contact with the network to ensure ion exchange within the composite electrode and with the other components of t cell and also acts as a deformable binder for the assembly of the composite electrode, its collector and the cell electrolyte separator, the polymer electrolyte optionally containing a dispersed second electronic conduction additive for optimizing electr exchange within the composite electrode and its collector. The composite electrode is thus provided with exchange surface zones which are inaccessible to the polymer electrolyte components and to contaminants from other cell components and which are thus l susceptible to passivating film formation or to degradation, so that high quality electrical contacts are ensured within the composite electrode in spite of difficult temperature, voltage or cycling conditions. Independent claims are also included for the following: (i) an electrochemical cell comprising an electrolyte separator between the above composite electrode and a second electrod the separator comprising a solid polymer electrolyte, a combination of a polymer, an aprotic solvent and a dissociated lithium salt powder bonded by a (partially) vitreous mineral type electrolyte impregnated with a liquid or polymeric electrolyte; (ii) preparation of the above composite electrode by dispersing electrode material particles in an aqueous solution of the first electrolyte or its precursor, applying the resulting dispersion onto a current collector, drying and optionally applying a dispersion of a second electronic conduction additive in an organic polymer electrolyte containing a lithium salt onto the resul porous mineral network film; and (iii) production of a half cell by carrying out the above process (ii), applying a dispersion of a mineral powder in anothe aqueous solution of the mineral electrolyte or its precursor to form a half cell comprising the collector, the composite mineral network and a porous mineral separator and then applying a polymer electrolyte containing a lithium salt onto the porous half ce |
