Method for producing a lithium-ion cell
View Patent ↗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.
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 by impregnation with a liquid electrolyte, wherein the liquid electrolyte consists of a conductive lithium salt and an organic solvent, wherein the volume of the liquid electrolyte in the contacting per square meter of the electrochemically active coating is less than 100 ml;
C) winding and/or folding the first and/or second electrode, wherein the liquid electrolyte remains liquid in step C), and step C) is carried out after step B); and
D) combining the first electrode with a separator and the second electrode.
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 liquid electrolyte 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 liquid electrolyte 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 liquid electrolyte comprises an organic carbonate.
6. The method according to claim 1 , wherein the first and/or second electrochemically active coating has a layer thickness of at least 75 μm.
7. The method according to claim 1 , wherein the first and/or second electrode is coherent in sheet form in a longitudinal direction.
8. The method according to claim 7 , 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.
9. The method according to claim 1 , wherein the first and/or second electrochemically active coating contains no plasticizer.