Composite polymer electrolyte membrane
AssigneesJapan Gore-Tex, Inc., Nippon Telegraph and Telephone Corporation
InventorsToshihiro Ichino, Yukitoshi Takeshita, Fumio Yamamoto, Hiroshi Kato, Naofumi Mushiake, Takayuki Wani
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Abstract
A composite polymer electrolyte membrane which includes an ion-conductive polymer gel contained and supported by a matrix material formed of a porous polytetrafluoroethylene membrane. The porous polytetrafluoroethylene membrane has an internal structure which defines a three-dimensional network of interconnected passages and pathways throughout the membrane. The composite polymer electrolyte membrane has a tensile break strength of at least 10 MPa in at least two orthogonal planar directions, ion conductivity of at least 1 mS/cm, and is useful as a separator between electrodes of a lithium secondary cell.
Claims15
A composite polymer electrolyte membrane comprising:
- a matrix material formed of a porous polytetrafluoroethylene membrane having opposite-facing planar surfaces and, between said surfaces, having an internal structure defining a three-dimensional network of interconnected passages and pathways;
- said matrix material containing, throughout said passages and pathways, an amount of an ion-conductive non-solid polymer gel, whereby a continuous ion-conductive path from one said surface to at least said opposed surface is provided;
- wherein the ion-conductive gel comprises an organic polymer component and an ion-conductive component, and
- wherein said composite membrane has a tensile break strength in at least two orthogonal directions of 10 MPa or greater.
Dependencies are inferred from the claim text.