Method for producing a lithium-ion cell

Patent metadata

Field	Value
Publication number	US-11508994-B2
Application number	US-202017069898-A
Country	US
Kind code	B2
Filing date	Oct 14, 2020
Priority date	Dec 18, 2014
Publication date	Nov 22, 2022
Grant date	Nov 22, 2022

Abstract

A method for producing a lithium-ion cell is provided. The electrochemically active coating of an electrode is brought into contact with an electrolyte or an auxiliary liquid before a winding or cutting operation. This method is suitable in particular for continuously producing lithium-ion cells by means of processes proceeding at high speed, such as winding processes.

First claim

What is claimed is:

1. A method for producing a lithium-ion cell, comprising the following steps:
A′) providing a first electrode having a first electrode collector and a first electrochemically active coating applied onto the first electrode collector, and a second electrode having a second electrode collector and a second electrochemically active coating applied onto the second electrode collector,
B′) contacting at least part of the first and/or second electrochemically active coating with an auxiliary liquid,
C′) cutting, winding and/or folding the first and/or second electrode, wherein step C′) is carried out after step B′),
D′) combining the first electrode with a separator and the second electrode, and
E′) supplying an electrolyte,
wherein the method further comprises a step F′) for removing the auxiliary liquid, wherein the removal of the auxiliary liquid takes place by heating the first and/or second electrode to a temperature between 30 and 120° C., and wherein step F′) is carried out during step C′) and/or step D′).

2. The method according to claim 1 , wherein step C′) is carried out before and/or after step D′).

3. The method according to claim 1 , wherein after the contacting in step B′), the part of the first and/or second electrochemically active coating has the auxiliary liquid in a volume fraction of at most 60% in relation to the total volume of the part of the first and/or second electrochemically active coating.

4. The method according to claim 1 , wherein after the contacting in step B′), the part of the first and/or second electrochemically active coating has the auxiliary liquid in a volume fraction of at least 10% in relation to the total volume of the part of the first and/or second electrochemically active coating.

5. The method according to claim 1 , wherein the auxiliary liquid has a boiling point of at most 120° C. under chemical standard conditions.

6. The method according to claim 1 , wherein the auxiliary liquid is anhydrous and/or aprotic.

7. The method according to claim 1 , wherein the first and/or second electrochemically active coating has a layer thickness of at least 75 μm.

8. The method according to claim 1 , wherein the first and/or second electrode is coherent in sheet form in a longitudinal direction.

9. The method according to claim 8 , wherein the first and/or second electrode is conveyed in step C′) along the longitudinal direction at a speed of at least 5 m/min.

10. The method according to claim 1 , wherein the first and/or second electrochemically active coating contains no plasticizer.

11. A method for producing a lithium-ion cell, comprising the following steps:
A′) providing a first electrode having a first electrode collector and a first electrochemically active coating applied onto the first electrode collector, and a second electrode having a second electrode collector and a second electrochemically active coating applied onto the second electrode collector,
B′) contacting at least part of the first and/or second electrochemically active coating with an auxiliary liquid,
C′) cutting, winding and/or folding the first and/or second electrode, wherein step C′) is carried out after step B′),
D′) combining the first electrode with a separator and the second electrode, and
E′) supplying an electrolyte,
wherein the auxiliary liquid is not removed prior to supplying the electrolyte in step E′).

Assignees

• Bayerische Motoren Werke Ag

Inventors

• Tsiouvaras Nikolaos
• Woehrle Thomas

Classifications

• H01M4/139

  Processes of manufacture · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• H01M4/0435

  Rolling or calendering · CPC title

• H01M4/0416 Primary

  involving impregnation with a solution, dispersion, paste or dry powder (H01M4/0438 takes precedence) · CPC title