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System and method for multilayer fabrication of lithium polymer batteries and cells
| Details |
Inventors: Gonzalez, Jose E; Cochran, Steven D;
Assignee: Delphi Technologies Inc. (Troy, MI)
Primary Examiner: Ruthkosky; Mark
Assistant Examiner:
Attorney, Agent or Firm: Funke; Jimmy L.
Method of making Li-intercalateable electrodes for a lithium-ion battery by applying a first film onto a first face of an electrically conductive grid, which film comprises a plurality of Li-intercalateable particles dispersed throughout a mixture of a polymeric binder and a plasticizer for the binder. Thereafter, a film-forming slurry having the same composition as the first film, plus a solvent therefor, is applied to a second face of the grid opposing the first face so as to provide a second film and such that the solvent in the slurry dissolves at least a portion of the first film and promotes solvent bonding of the films with the grid embedded therein. A polymeric backing film defining a separator is used as a manufacturing process aid, thereby eliminating the step of using a carrier film onto which the electrodes are fabricated and stripping off the carrier and discarding the same. |
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DETAILED DESCRIPTION Manufacturing complexity, cost, and scrap rate can be reduced, production rates increased, and better contact between the grid and the electrode material achieved by a process according to the present invention.
The invention involves using a separator as a backing film in the coating process.
Since the separator is used in cells and batteries, it can be retained, unlike the carrier disclosed in copending application Ser.
No.
09/862,388, which is removed and discarded.
This improvement allows attachment of the separator at an earlier stage in the overall process, and further, eliminates steps.
In a preferred embodiment, the separator is a polymeric backing film.
The separator performs its conventional function as well as a new function, namely, that of a carrier or backing film.
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