METHOD FOR MANUFACTURING ELECTRODE SLURRY FOR SECONDARY BATTERY, AND ELECTRODE INCLUDING THE SAME
Provided is a method for manufacturing electrode slurry including: a) kneading a first mixture including an electrode active material and a thickener solution; and b) preparing a second mixture including the kneaded first mixture and a conductive agent, in which a solid content in the second mixture is smaller than that of the first mixture.
1 . A method for manufacturing electrode slurry, comprising:
a) kneading a first mixture including an electrode active material and a thickener solution; and
b) preparing a second mixture including the kneaded first mixture and a conductive agent,
wherein a solid content in the second mixture is smaller than that of the first mixture.
2 . The method of claim 1 , wherein the kneading is performed at a shear force of 60 Pa or more.
3 . The method of claim 1 , wherein a solid content in the first mixture is 55 to 70 wt %.
4 . The method of claim 1 , wherein a solid content in the second mixture is 35 to 55 wt %.
5 . The method of claim 1 , wherein a viscosity of the kneaded first mixture is 3000 to 20000 cP.
6 . The method of claim 1 , wherein a viscosity of the second mixture is 2000 to 15000 cP.
7 . The method of claim 1 , further comprising:
c) preparing a third mixture by mixing the second mixture and a binder.
8 . The method of claim 7 , wherein a solid content in the third mixture is 35 to 55 wt %.
9 . The method of claim 1 , wherein the conductive agent is at least one selected from the group consisting of carbon nanotube, acetylene black, carbon black, natural graphite, artificial graphite, Ketjen black, and carbon fiber.
10 . The method of claim 9 , wherein the conductive agent includes single-walled carbon nanotube (SWCNT).
11 . An electrode for a secondary battery, comprising:
a current collector; and
an electrode active material layer configured to be located on at least one surface of the current collector, and include an electrode active material, a conductive agent, and a binder,
wherein a content of the conductive agent in the electrode active material layer is 0.05 to 0.2 wt %,
the conductive agent includes single-walled carbon nanotube (SWCNT) having a length of 5 pm or more, and
a resistance of the electrode depending on a 4 point-probe measurement method is 3 Ω.cm or less.
12 . The electrode of claim 11 , wherein the electrode active material includes a silicon oxide-based active material and a carbon-based active material in a weight ratio of 20:80 to 5:95.
13 . The electrode of claim 11 , wherein the electrode includes a negative electrode.
14 . The electrode of claim 11 , wherein a 100-cycle capacity retention rate of a lithium secondary battery including the electrode is 92% or more.
15 . A secondary battery comprising the electrode of claim 11 .