Flexible composite solid polymer electrochemical membrane
A solid state battery includes a flexible polymer sheet, and an array of solid state pillars supported by and extending through the sheet. Each of the pillars has an anode layer, a cathode layer adjacent, and an inorganic solid electrolyte (ISE) layer interposed between the anode and cathode layers. A flexible electrochemical membrane includes a flexible polymer sheet, and an array of inorganic solid electrolyte pillars supported by the polymer sheet with each of the pillars extending through a thickness of the sheet to form an ionically conductive pathway therethrough.
1. A flexible electrochemical membrane comprising:
a flexible polymer sheet having a first side and a second opposed side spaced apart by a thickness; and
an array of inorganic solid electrolyte pillars supported by the polymer sheet, each pillar extending through the thickness of the sheet with a first exposed end adjacent to the first side and a second exposed end adjacent to the second side to form an ionically conductive pathway across the sheet.
2. The membrane of claim 1 wherein the array of pillars is aligned with respect to a thickness of the membrane.
3. The membrane of claim 1 wherein each of the pillars is oriented generally perpendicular to a plane defined by the polymer sheet.
4. The membrane of claim 1 wherein the array of pillars provides mechanical strength for the membrane and wherein the polymer sheet interconnects the pillars to provide flexibility for the membrane such that one pillar is moveable relative to another pillar in the array.
5. The membrane of claim 1 wherein the polymer sheet has a first polymer layer formed from a first polymer in contact with a second polymer layer formed from a second polymer.
6. The membrane of claim 1 wherein the polymer sheet includes one of a co-polymer and a polymer blend.
7. The membrane of claim 1 wherein each of the pillars is generally cylindrical.
8. The membrane of claim 1 wherein at least one of the first and second exposed ends of each pillar is co-planar with the first and second sides, respectively, of the polymer sheet.
9. The membrane of claim 1 wherein at least one of the first and second ends of each pillar extends outwardly to protrude from the first and second sides, respectively, of the polymer sheet.
10. The membrane of claim 1 wherein each pillar has a variable cross section along an axial length of the pillar such that the first exposed end has a smaller surface area than the second exposed end of the pillar.
11. The membrane of claim 1 wherein the polymer sheet comprises a first layer providing the first side, a second layer providing the second side, and a third layer positioned between and connecting the first and second layers, the first and second layers selected to be inert with a surrounding environment.
12. A flexible electrochemical membrane comprising:
a flexible non-ionically conductive polymer sheet having a first side and a second opposed side; and
an array of inorganic solid electrolyte pillars, each pillar supported and surrounded by the polymer sheet, each pillar extending through a thickness of the sheet and having a first exposed end adjacent to the first side and a second exposed end adjacent to the second side to form an ionically conductive pathway therethrough.
13. The membrane of claim 12 wherein the first exposed end of each pillar protrudes from the first side of the polymer sheet.
14. The membrane of claim 12 wherein a length of each pillar between the first and second ends is at least the thickness of the sheet.