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US 2026/0094835 A1Published application
Compositions and methods for dry electrode films including elastic polymer binders
AssigneeTesla, Inc.
InventorsJoon Ho Shin, Hieu Minh Duong
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Abstract
Provided herein are dry process electrode films, and energy storage devices incorporating the same, including an elastic polymer binder. In some embodiments, the dry process electrode films are PTFE-free or comprise an insubstantial amount of PTFE. The electrode films exhibit improved mechanical and processing characteristics. Also provided are methods for processing such elastic polymer binders, and for incorporating the elastic polymer binders in electrode films.
Claims28
A dry electrode film for use in an energy storage device comprising:
- a dry active material comprising dry particles;
- and
- a dry binder comprising an elastic polymer selected from the group consisting of polyethylene, poly(ethylene oxide), polyvinylidene fluoride, and admixtures thereof;
- wherein the dry electrode film is free-standing, contains no polytetrafluoroethylene (PTFE), is absent of solvent residue, has a thickness of about 30-2000 μm, comprises at least 96 wt. % of active material, and comprises about 0.5-4 wt. % of the elastic polymer.
1 more element
A dry electrode film fabrication process comprising:
- mixing a dry active material comprising dry particles, and a dry binder to form a dry first mixture, wherein the dry binder comprises an elastic polymer;
- and
- calendering the dry first mixture to form a dry electrode film;
- wherein the dry electrode film is free-standing, contains no polytetrafluoroethylene (PTFE), has a thickness of about 30-2000 μm, comprises at least 96 wt. % of active material, and comprises about 0.5-4 wt. % of the elastic polymer;
- and
- wherein the elastic polymer is selected from the group consisting of polyethylene, poly(ethylene oxide), polyvinyldene fluoride, and admixtures thereof.
3 more elements
Dependencies are inferred from the claim text.