Negative electrode active material and negative electrode for secondary battery comprising the same
View Patent ↗Provided are a negative electrode active material including spherical artificial graphite and natural flake graphite, wherein the spherical artificial graphite and the natural flake graphite are included in a weight ratio of 80:20 to 95:5, and a negative electrode for a lithium secondary battery including the same.
1. A negative electrode for a secondary battery, the negative electrode comprising:
a current collector; and
a negative electrode material mixture layer coated on the current collector,
wherein the negative electrode material mixture layer comprises a negative electrode active material, a conductive agent, and a binder,
wherein the negative electrode active material comprises:
spherical artificial graphite; and
natural flake graphite,
wherein the spherical artificial graphite and the natural flake graphite are included in a weight ratio of 80:20 to 95:5,
wherein the electrode density of the negative electrode for a secondary battery is in a range of 1.64 g/cc to 1.80 g/cc,
wherein a ratio of the average particle diameter (D 50 ) of the spherical artificial graphite to a maximum diameter of the natural flake graphite is in a range of 1:0.4 to 1:1.5, and
wherein the average particle diameter (D 50 ) of the negative electrode active material is in a range of 11 μm to 16 μm.
2. The negative electrode for a secondary battery of claim 1 , wherein an average particle diameter (D 50 ) of the spherical artificial graphite is in a range of 12 μm to 16 μm.
3. The negative electrode for a secondary battery of claim 1 , wherein a ratio of the average particle diameter (D 50 ) of the spherical artificial graphite to a maximum diameter of the natural flake graphite is in a range of 1:0.6 to 1:1.
4. The negative electrode for a secondary battery of claim 1 , wherein a ratio of the average particle diameter (D 50 ) of the spherical artificial graphite to a maximum diameter of the natural flake graphite is 1:0.8.
5. The negative electrode for a secondary battery of claim 1 , wherein the spherical artificial graphite is derived from petroleum coke.
6. The negative electrode active material of claim 1 , wherein the spherical artificial graphite and the natural flake graphite are included in a weight ratio of greater than 80:20 and less than or equal to 95:5.
7. A secondary battery comprising:
a negative electrode;
a positive electrode;
a separator disposed between the negative electrode and the positive electrode; and
an electrolyte,
wherein the negative electrode comprises the negative electrode of claim 1 .