Mechanical stripping of sacrificial layer

Patent metadata

Field	Value
Publication number	US-12494471-B2
Application number	US-202318534499-A
Country	US
Kind code	B2
Filing date	Dec 8, 2023
Priority date	Dec 8, 2023
Publication date	Dec 9, 2025
Grant date	Dec 9, 2025

Abstract

Systems and methods are provided herein for removing alternate material from a foil while minimizing the amount of alternate material particles that are deposited on the surface of an active material. For example, a web may comprise an active material on a first portion of a foil and an alternate material on a second portion of the foil. One or more brushes may be used to remove the alternate material from the second portion of the foil. As the one or more brushes remove the alternate material from the second portion of the foil, a vacuum may be used to capture the alternate material that is removed from the second portion of the foil. In such an example, the resulting web no longer has alternate material on the second portion of the foil and has reduced alternate material particles on the surface of the active material.

First claim

What is claimed is:

1 . A method comprising:
coating a first portion of a foil with an active material; coating a second portion of the foil with an alternate material; generating a web by calendering the foil comprising the active material on the first portion of the foil and the alternate material on the second portion of the foil; and removing the alternate material from the second portion of the foil, the alternate material being removed using (a) a first brush, (b) etching, or any combination of (a) and (b).

2 . The method of claim 1 , wherein the alternate material reduces wrinkling in the second portion of the foil.

3 . The method of claim 2 , wherein the alternate material reduces wrinkling in the second portion of the foil based, at least in part, on a thickness of the alternate material.

4 . The method of claim 1 , wherein the alternate material is removed using the first brush.

5 . The method of claim 4 , further comprising collecting the alternate material removed, using vacuum.

6 . The method of claim 4 , wherein the alternate material is removed using the first brush and a second brush.

7 . The method of claim 1 , wherein removing the alternate material further comprises removing at least a portion of the alternate material using laser ablation.

8 . The method of claim 1 , wherein the alternate material is removed using the etching.

9 . The method of claim 1 , further comprising drying the foil comprising the active material on the first portion of the foil and the alternate material on the second portion of the foil.

10 . The method of claim 1 , further comprising slitting the web into one or more electrodes.

11 . A method comprising:
coating a first portion of a foil with an active material having a first thickness; coating a second portion of the foil with an alternate material having a second thickness; drying the foil comprising the active material on the first portion of the foil and the alternate material on the second portion of the foil; generating a web by calendering the foil comprising the active material on the first portion of the foil and the alternate material on the second portion of the foil, the alternate material reducing wrinkling in the second portion of the foil based, at least in part, on the second thickness of the alternate material; removing the alternate material from the second portion of the foil using a first brush and a first vacuum; and slitting the web into one or more electrodes.

12 . The method of claim 11 , further comprising removing a portion of the alternate material using laser ablation.

13 . The method of claim 11 , further comprising coating a third portion of the foil with a second alternate material having the second thickness.

14 . The method of claim 13 , further comprising removing the second alternate material from the third portion of the foil using a second brush and a second vacuum.

15 . The method of claim 11 , wherein the active material and the alternate material are coated on a first surface of the foil.

16 . The method of claim 15 , further comprising coating the second portion of a second surface of the foil with a second alternate material having the second thickness.

17 . The method of claim 16 , further comprising removing the second alternate material from the second portion of the second surface of the foil using a second brush and a second vacuum.

18 . The method of claim 16 , further comprising coating a third portion of the first surface of the foil with a third alternate material having the second thickness.

19 . The method of claim 18 , further comprising removing the third alternate material from the third portion of the foil using a third brush.

20 . The method of claim 18 , wherein the active material coated on the first portion of the foil is between (i) the alternate material coated on the second portion of the foil and (ii) the third alternate material coated on the third portion of the foil.

Assignees

• Enovix Corp

Inventors

• Park Ki Tae
• Shi Chaojun
• Shimizu Yoshifumi
• Fortunati Kim Lester
• Hague Ashim Shatil

Classifications

• H01M4/0435

  Rolling or calendering · CPC title

• H01M4/0471

  involving thermal treatment, e.g. firing, sintering, backing particulate active material, thermal decomposition, pyrolysis · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M4/0404 Primary

  by coating on electrode collectors · CPC title