Anode for lithium secondary battery and lithium secondary battery including the same

1. An anode for a lithium secondary battery, comprising:

a current collector; and

an anode active material layer comprising an anode active material and being formed on the current collector, the anode active material comprising a core containing an artificial graphite and a shell formed on a surface of the core, the shell containing an amorphous carbon,

wherein an average of a Raman R value of the anode active material layer is in a range from 0.5 to 0.65, and a standard deviation of the Raman R value is less than 0.22, where the Raman R value is defined as a ratio (I D /I G ) of a D band intensity (I D ) relative to a G band intensity (I G ), and the D band and the G band are obtained from a Raman spectrum of a surface of the anode active material layer; and

the average of the Raman R value and the standard deviation of the Raman R value are calculated from a frequency distribution graph obtained by performing a Raman spectroscopy analysis at 100 points or more of the surface of the anode active material layer.

2. The anode for the lithium secondary battery according to claim 1 , wherein the average and the standard deviation of the Raman R value are calculated from a probability density function derived by a normalization with respect to a frequency distribution graph of the Raman R value.

3. The anode for the lithium secondary battery according to claim 1 , wherein the G band intensity is a peak intensity with respect to a wave number region from 1,540 cm −1 to 1,620 cm −1 , and the D band intensity is a peak intensity with respect to a wave number region from 1,300 cm −1 to 1,420 cm −1 .

4. The anode for the lithium secondary battery according to claim 1 , wherein the amorphous carbon is at least one selected from a group consisting of a coal-based pitch, an oil-based pitch, polyvinyl chloride, a mesophase pitch, tar, a low molecular weight intermediate crude oil, citric acid, stearic acid, sucrose, polyvinylidene fluoride, carboxymethyl cellulose, hydroxypropyl cellulose, a recycled cellulose, polyvinyl pyrrolidone, polyethylene, polypropylene, ethylene-propylene-diene monomer (EPDM), polyacrylic acid, polyacrylonitrile, glucose, gelatin, a phenol resin, a naphthalene resin, a polyamide resin, a furan resin, a polyvinyl alcohol resin, a polyimide resin, a cellulose resin, a styrene resin and an epoxy resin.

5. The anode for the lithium secondary battery according to claim 1 , wherein an amount of the shell is in a range from 0.5 wt % to 10 wt % based on a total weight of the core and shell.

6. The anode for the lithium secondary battery according to claim 1 , wherein the core includes a secondary particle formed from a primary particle containing the artificial graphite.

7. The anode for the lithium secondary battery according to claim 6 , wherein an average diameter (D 50 ) of the primary particle is in a range from 5 μm to 15 μm, and an average diameter (D 50 ) of the secondary particle is in a range from 10 μm to 25 μm.

8. The anode for the lithium secondary battery according to claim 1 , wherein a density of the anode active material layer is 1.45 g/cm 3 or more.

9. The anode for the lithium secondary battery according to claim 1 , wherein the anode active material layer further includes a binder,

wherein an amount of the binder is 3 wt % or less based on a total weight of the anode active material and the binder.

10. A lithium secondary battery, comprising:

the anode of claim 1 ;

a cathode; and

a separator interposed between the anode and the cathode.