Method for producing negative electrode active material for lithium secondary battery
The present invention relates to a negative electrode active material of a lithium secondary battery, a manufacturing method thereof, and a lithium secondary battery using the same. An embodiment of the present invention provides a negative electrode active material for a lithium secondary battery, including a graphite material including secondary particles, wherein the secondary particles are an assembly of a plurality of primary particles, the primary particles include green coke, and a ratio ((D90−D10)/D50) of a difference between a particle diameter D90 and a particle diameter D10 with respect to a particle diameter D50 of the secondary particles is 1.0 to 1.32. An embodiment of the present invention provides a method for manufacturing a negative electrode active material for a lithium secondary battery, including: manufacturing primary particles by using a carbon raw material including green coke; manufacturing secondary particles by mixing the primary particles and a binder; carbonizing the secondary particles; and manufacturing a graphite material by graphitizing the carbonized secondary particles, wherein a particle diameter D50 of the primary particles is 5.5 to 10.0 μm.
1 . A negative electrode active material for a lithium second battery, comprising a graphite material including secondary particles,
wherein the secondary particles are an assembly of a plurality of primary particles,
the primary particles include carbon raw material derived from green coke, and
a ratio ((D90−D10)/D50) of a difference between a particle diameter D90 and a particle diameter D10 with respect to a particle diameter D50 of the secondary particles is 1.09 to 1.21,
wherein a specific surface area (BET) of the graphite material is 0.95 to 1.67 m 2 /g,
wherein a particle diameter D50 of the primary particles is 6.0 to 9.0 μm.
2 . The negative electrode active material for a lithium secondary battery of claim 1 , wherein
a span value that is the ratio ((D90−D10)/D50) of a difference between a particle diameter D90 and a particle diameter D10 with respect to a particle diameter D50 of the secondary particles is 1.0 to 1.2.
3 . The negative electrode active material for a lithium secondary battery of claim 2 , wherein
sphericity of the secondary particles is 0.8 to 1.0.
4 . The negative electrode active material for a lithium secondary battery of claim 3 , wherein
the particle diameter D50 of the secondary particles is 11 to 25 μm.
5 . The negative electrode active material for a lithium secondary battery of claim 1 , wherein
tap density of the graphite material 0.8 g/cc to 1.2 g/cc.
6 . The negative electrode active material for a lithium secondary battery of claim 5 , wherein
the graphite material satisfies Equation 1:
Specific surface area [m 2 /g]/tap density [g/cc]<2. [Equation 1]
7 . A lithium secondary battery comprising:
a positive electrode;
a negative electrode including a negative electrode active material for a lithium secondary battery of claim 1 ; and
an electrolyte.