Method of manufacturing lithium-ion secondary battery electrode sheet
A method of manufacturing a lithium-ion secondary battery electrode sheet proposed herein includes the step of pressing granulated particles ( 13 a ), wherein the ratio (t/D50) is less than 1, where D50 is the mean particle size of the granulated particles ( 13 a ) and t is the thickness of a layer ( 14 ) of active material particles ( 13 a 1 ) after pressing.
1. A method of manufacturing a lithium-ion secondary battery electrode sheet, comprising the steps of:
preparing a current collector;
preparing a mixture in which active material particles and a first binder are mixed with a first solvent;
preparing granulated particles containing the active material particles and the first binder by spraying the mixture in a dry atmosphere;
preparing a binder solution in which a second binder is mixed with a second solvent;
applying the binder solution onto the current collector;
feeding the granulated particles onto the current collector after applying the binder solution;
leveling the granulated particles fed on the current collector; and
pressing and destroying the leveled granulated particles, wherein
in the step of preparing granulated particles, a mean particle size of the prepared granulated particles is from 60 μm to 100 μm, and wherein
in the step of feeding the granulated particles, the ratio (t/D50) is less than 1, where D50 is the mean particle size of the granulated particles fed onto the current collector and t is the thickness of a layer of the active material particles that has been formed subsequent to the step of pressing.
2. The method according to claim 1 , wherein the ratio (t/D50) is greater than 0.5.
3. The method according to claim 1 , wherein the first binder and the second binder are a same material.
4. The method according to claim 1 , wherein the first binder and the second binder are different materials.
5. The method according to claim 1 , wherein the pressing and destroying of the leveled granulated particles increases a number of contact locations of the first binder with the active material particles and the current collector.
6. The method according to claim 1 , wherein the pressing and destroying of the leveled granulated particles increases a bonding strength between the active material particles.
7. The method according to claim 1 , wherein the pressing and destroying of the leveled granulated particles adheres the first binder between active material particles contained in different granulated particles.
8. The method according to claim 1 , wherein the pressing and destroying of the leveled granulated particles increases a bonding strength between active material particles in different granulated particles.
9. The method according to claim 1 , wherein the first solvent and the second solvent are different materials.