Method for preparing electrode mix and the electrode mix prepared by using the same
View Patent ↗Disclosed are a method for preparing an electrode mix comprising (i) adding an electrode active material, a conductive material and a binder to a solvent, (ii) further adding a surfactant to the mixture of step (i), and (iii) mixing the resulting mixture of step (ii) and an electrode mix for secondary batteries prepared by the method.
1. A method for preparing a lithium secondary battery, comprising:
(a) preparing an anode for the lithium secondary battery by:
(a-i) adding an anode active material for a lithium secondary battery, which has a mean particle diameter of 30 μm or less, a conductive material and a binder to a solvent to form a mixture, wherein said anode active material comprises lithium titanium oxide (LTO) represented by Formula 4:
Li a Ti b O 4 (4)
wherein 0.5<a<3 and 1<b<2.5;
(a-ii) further adding a surfactant to the mixture of step (a-i);
(a-iii) mixing the resulting mixture of step (a-ii) to obtain an anode mix; and
(a-iv) applying the anode mix obtained in step (a-iii) to an anode current collector;
(b) preparing a cathode for the lithium secondary battery by:
(b-i) adding a cathode active material for a lithium secondary battery, which has a mean particle diameter of 30 μm or less, a conductive material and a binder to a solvent to form a mixture, wherein said cathode active material comprises a lithium nickel manganese oxide with a spinel structure represented by the following Formula 2:
Li x Ni y Mn 2−y O 4 (2)
wherein 0.9<x<1.2, and 0.4<y<0.5, and
(b-ii) further adding a surfactant to the mixture of step (b-i);
(b-iii) mixing the resulting mixture of step (b-ii) to obtain a cathode mix; and
(b-iv) applying the cathode mix obtained in step (b-iii) to a cathode current collector; and
(c) preparing the lithium secondary battery with the anode of step (a) and the cathode of step (b).
2. The method according to claim 1 , wherein the electrode active material has a surface area of 1 m 2 /g or more.
3. The method according to claim 1 , wherein the solvent is a polar solvent or a non-polar solvent.
4. The method according to claim 3 , wherein the solvent is a polar solvent and the surfactant is an anionic surfactant and/or a cationic surfactant.
5. The method according to claim 3 , wherein the solvent is a non-polar solvent and the surfactant is a nonionic surfactant.
6. The method according to claim 1 , wherein the surfactant is at least one selected from the group consisting of an anionic surfactant, a cationic surfactant and a nonionic surfactant.