Method of manufacturing negative electrode having inorganic coating layer formed thereon
The present technology relates to a method of manufacturing a negative electrode, and the method includes: manufacturing a negative electrode having a negative electrode active material layer formed thereon by coating a negative electrode slurry including a negative electrode active material at least on one surface of a current collector; pre-lithiating the negative electrode; and forming an inorganic coating layer on a surface of the negative electrode active material layer by aging the pre-lithiated negative electrode under an CO 2 atmosphere.
1 . A method of manufacturing a negative electrode, the method comprising:
coating a negative electrode slurry comprising a negative electrode active material on at least one surface of a current collector, to form a negative electrode having a negative electrode active material layer formed thereon;
pre-lithiating the negative electrode; and
aging the pre-lithiated negative electrode under an CO 2 atmosphere to form an inorganic coating layer on a surface of the negative electrode active material layer.
2 . The method of claim 1 , wherein the inorganic coating layer comprises at least one compound selected from the group consisting of Li 2 O, LiOH and Li 2 CO 3 .
3 . The method of claim 1 , wherein the inorganic coating layer comprises Li 2 O, LiOH and Li 2 CO 3 .
4 . The method of claim 1 , wherein the negative electrode active material is selected from the group consisting of a graphite-containing active material, a silicon-containing active material, and mixtures thereof.
5 . The method of claim 1 , wherein the pre-lithiating of the negative electrode is performed by directly contacting a lithium metal on the negative electrode active material layer.
6 . The method of claim 5 , wherein the pre-lithiating of the negative electrode comprises bonding a lithium metal film on the negative electrode active material layer and then performing lamination.
7 . The method of claim 1 , wherein the pre-lithiating of the negative electrode is performed by connecting the negative electrode to a lithium metal and performing electrochemical charging.
8 . The method of claim 1 , wherein a pressure of CO 2 during the aging of the pre-lithiated negative electrode is in a range of 0.1 to 10 mTorr.
9 . The method of claim 1 , wherein aging of the pre-lithiated negative electrode is performed at a temperature from 20° C. to 60° C.
10 . The method of claim 1 , wherein aging of the pre-lithiated negative electrode is performed for a time from 10 hours to 60 hours.