Highly filled solid polymer electrolyte
AssigneeMotorola, Inc.
InventorsFlorence O. Eschbach, Manuel Oliver, Ganesh Venugopal, Shekhar Pendalwar
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Abstract
An electrochemical cell (10) includes first and second electrodes (12) and (14) with an electrolyte system (26) disposed therebetween. The electrolyte system includes at least a filler material and a gelling polymer. The filler material comprises at least about 50 vol. % of the total amount of polymer in the electrolyte system, and has a porosity on the order of about 20-80%.
Claims23
A rechargeable electrochemical cell including an anode, a cathode and an electrolyte system, said electrolyte system comprising:
- a polymeric support structure comprising at least 50 vol. % of a filler material and a gelling polymer;
- and
- an electrolyte active species dispersed through at least said gelling polymer.
An electrolyte system for a rechargeable electrochemical cell, said electrolyte system comprising:
- a polymeric support structure including at least 50 wt % of a filler material selected from the group consisting of polyethylene, polypropylene, polytetrafluoroethylene, polystyrene, polyethyleneterephthalate, ethylene propylene diene monomer, nylon, and combinations thereof, and a gelling polymer selected from the group consisting of polyvinylidene fluoride (PVDF), polyurethane, polyethylene oxide, polyacrylonitrile, polymethylacrylate, polyacrylamide, polyvinylacetate, polyvinylpyrrolidone, polytetraethylene, glycol diacrylate, copolymers of any of the foregoing, and combinations thereof;
- and
- an electrolyte active species dispersed through at least said gelling polymer.
A method of forming a highly filled polymer gel electrolyte for a rechargeable electrochemical cell comprising the steps of:
- providing a mixture of an inert filler material;
- a gelling polymer;
- and
- a processing aid, wherein the filler comprises at least 50 vol. % of the total mixture;
- providing a processing aid;
- heating said mixture and said processing aid to a temperature sufficient to melt at least said gelling polymer;
- forming said mixture into a free standing film;
- and
- removing an residual processing aid from said film.
Dependencies are inferred from the claim text.