Structure and materials of tapes for electrochemical cells utilizing liquefied gas electrolytes
AssigneeSouth 8 Technologies, Inc.
InventorsJungwoo Lee, Jeremy Intrator, Frederick Krause, Cyrus S. Rustomji
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Abstract
Electrochemical cells employing liquefied gas electrolytes may experience degradation of certain polymer components, such as tapes made from poly(ethylene terephthalate), poly(butylene terephthalate), or polydimethylsiloxane. These materials exhibit low chemical stability, potentially leading to cell failure. Embodiments disclosed herein utilize stable polymers, including polyimide, polypropylene, or polyethylene as tape carriers and poly(methyl methacrylate) as adhesives, to enhance compatibility and performance in such cells.
Claims28
An electrochemical cell comprising:
- a positive electrode;
- a negative electrode;
- a separator disposed between the positive electrode and the negative electrode;
- a liquefied gas electrolyte in contact with the positive electrode, the negative electrode, and the separator;
- a tape securing at least a portion of an assembly comprising the positive electrode, the negative electrode, and the separator;
- the tape being in direct contact with the liquefied gas electrolyte;
- and
- wherein:
- the tape comprises a carrier selected from the group consisting of polyimide, polypropylene, polyethylene, and combinations thereof, and an acrylic adhesive;
- and
- securing the assembly with the tape prevents adhesive dissolution detectable by FTIR after 48 hours in the liquefied gas electrolyte.
A method of assembling an electrochemical cell, comprising:
- providing a positive electrode, a negative electrode, and a separator;
- forming an assembly by disposing the separator between the positive electrode and the negative electrode;
- securing at least a portion of the assembly with a tape, wherein the tape comprises a carrier selected from the group consisting of polyimide, polypropylene, polyethylene, and combinations thereof, and an acrylic adhesive;
- and
- contacting the assembly with a liquefied gas electrolyte.
An electrochemical cell comprising:
- a jelly roll assembly including a positive electrode, a negative electrode, and a separator wound together;
- a liquefied gas electrolyte;
- a tape securing the jelly roll assembly, the tape being in direct contact with the liquefied gas electrolyte, wherein the tape comprises a carrier selected from the group consisting of polyimide, polypropylene, polyethylene, and combinations thereof, and an acrylic adhesive;
- and
- wherein:
- the tape exhibits chemical stability in the liquefied gas electrolyte;
- and
- securing the assembly with the tape prevents adhesive dissolution detectable by FTIR after 48 hours in the liquefied gas electrolyte.
Dependencies are inferred from the claim text.