Method for producing a lithium-ion cell

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.

Claims

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′).

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 shows schematically an embodiment of the method according to the invention, where an electrode EL is contacted via a contacting device KE, such as a spraying device or sprinkler system, for example, with the electrolyte and/or auxiliary liquid (indicated by the three vertical arrows) and then wound to form the roll ER.

(2) FIG. 2 shows schematically another embodiment of the method according to the invention, where an electrode EL is guided over deflecting rollers UR through a contact bath KB of electrolyte and/or auxiliary liquid, and then wound to form the roll ER.

DETAILED DESCRIPTION OF THE DRAWINGS

(3) The figures are purely exemplary in character and are not restricted to the feature combinations shown. For example, the schematic representation of the electrode EL may also represent a combination of a component sequence of an anode, a separator, a cathode, and a separator. Instead of the roll ER, it is also possible to assume a prismatic flat winding or a cutting device, such as a punch. It is likewise possible to add or omit individual features shown, or particular embodiments shown, provided the general technical teaching of the invention remains realized. In this sense, furthermore, the invention embraces any combination of features of the claims and of the description, even if that combination of features is not expressly mentioned.

(4) The foregoing disclosure has been set forth merely to illustrate the invention and is not intended to be limiting. Since modifications of the disclosed embodiments incorporating the spirit and substance of the invention may occur to persons skilled in the art, the invention should be construed to include everything within the scope of the appended claims and equivalents thereof.