Batteries with porous components
Assignee3M Innovative Properties Company
InventorsRobert B. Loch, James M. Larson, Brian D. Fredericksen
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Abstract
Approaches are described for producing porous, polymer electrodes with good characteristics for incorporation into polymer batteries. Two preferred processes are presented. The polymer electrodes can be subjected to additional processing to increase their porosity and electrical conductivity. The polymer electrodes preferably are incorporated into a polymer battery where the components are laminated together.
Claims9
A method of producing a porous, polymer electrode comprising cooling a composition comprising a melt blend of a polymer, redox active particles, electrically conductive particles chemically distinct from said redox active particles and a solubilizinig amount of a diluent to induce a phase transition, said polymer comprising polypropylene, poly(tetrafluoroethylene-co-perfluoro-(propyl vinyl ether)) or polyvinylidine fluoride.
A method of producing a porous, polymer article comprising
- providing a composition comprising a porous, polymer film and particles dispersed in said film, the amount of said particles being at least about 25% by volume of said composition, and
- heating said composition to a temperature within about 20.degree. C. of the melting point of said polymer for a time sufficient to narrow distribution of pore sizes of said film without substantially altering structural integrity of said film.
Dependencies are inferred from the claim text.