Method for manufacturing electrode and current collector for electrochemical device
View Patent ↗A current collector for an electrochemical device and a method for manufacturing the same are provided. The current collector has wrinkles formed spontaneously according to heat expansion and cold shrinking of a metal thin film. A method for manufacturing an electrode includes heating a metal thin film for a current collector, stretching the heated metal thin film, and cooling the heated metal thin film.
1. A method for manufacturing an electrode, comprising steps of:
heating a metal film for a current collector under vacuum or under atmosphere purged with an inert gas in order to prevent oxidation of the metal film;
stretching the heated metal film;
cooling the heated metal film to a surface temperature corresponding to −100° C. to −150° C. based on a heating temperature in the step of heating;
applying a slurry for forming an electrode active material layer warmed to 60° C.-100° C. to a surface of the cooled metal film; and
drying the slurry.
2. The method for manufacturing an electrode according to claim 1 , wherein the metal film is a metal film for a current collector and comprises copper and/or aluminum.
3. The method for manufacturing an electrode according to claim 1 , wherein the step of stretching is carried out by stretching the metal film to 102-125%.
4. The method for manufacturing an electrode according to claim 1 , further comprising cooling the metal film and the slurry either simultaneously with or after the step of drying the slurry.
5. The method for manufacturing an electrode according to claim 1 , wherein the metal film has a thickness of 5 μm to 30 μm.
6. The method for manufacturing an electrode according to claim 1 , further comprising a step of forming a heat resistant layer containing inorganic particles and a binder polymer on a surface of the electrode.
7. A method for manufacturing an electrode, comprising steps of:
heating a metal film for a current collector under vacuum or under atmosphere purged with an inert gas in order to prevent oxidation of the metal film;
stretching the heated metal film;
cooling the heated metal film by applying a slurry for forming an electrode active material layer to a surface of the stretched metal film; and
drying the slurry.
8. The method for manufacturing an electrode according to claim 7 , wherein in the step of applying the slurry, the slurry is at a temperature of 25° C.±10° C.
9. The method for manufacturing an electrode according to claim 7 , wherein the metal film is a metal film for a current collector and comprises copper and/or aluminum.
10. The method for manufacturing an electrode according to claim 7 , wherein the step of stretching is carried out by stretching the metal film to 102-125%.
11. The method for manufacturing an electrode according to claim 7 , wherein the metal film has a thickness of 5 μm to 30 μm.
12. The method for manufacturing an electrode according to claim 7 , further comprising a step of forming a heat resistant layer containing inorganic particles and a binder polymer on a surface of the electrode.
13. A method for manufacturing an electrode, comprising steps of:
heating a metal film for a current collector under vacuum or under atmosphere purged with an inert gas in order to prevent oxidation of the metal film;
stretching the heated metal film;
cooling a temperature of a surface of the heated metal film to a temperature of 25° C.±10° C.;
applying a slurry for forming an electrode active material layer to the surface of the cooled metal film; and
drying the slurry.
14. The method for manufacturing an electrode according to claim 13 , wherein the step of cooling the temperature of the surface of the heated metal film is carried out by air blast cooling and/or cold air cooling, and the metal film is cooled at a rate of 5° C./min-20° C./min.
15. The method for manufacturing an electrode according to claim 13 , wherein the metal film is a metal film for a current collector and comprises copper and/or aluminum.