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

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

a carbon-based particle including pores therein;

a silicon-containing coating layer formed at an inside of the pores of the carbon-based particle or on a surface of the carbon-based particle; and

a carbon coating layer formed on the silicon-containing coating layer, and the carbon coating layer comprising a conductive polymer,

wherein the silicon-containing coating layer does not include silicon carbide (SiC),

wherein a full width at half maximum (FWHM) of an O1s peak of a surface of the anode active material measured by an X-ray photoelectron spectroscopy (XPS) is 2.0 or more,

wherein an XPS Si2p peak area ratio defined by Equation 3 is 15.0% or less:

XPS Si2 p peak area ratio (%)={ p 1/( p 1+ p 2+ p 3)}*100  [Equation 3]

wherein, in Equation 3, p1 is a peak area of a Si—O bond of SiO2 measured on the surface of the anode active material from the XPS, p2 is a peak area of a Si—O bond of SiO x (0<x<2) measured on the surface of the anode active material from the XPS, and p3 is a peak area of a Si—Si bond measured on the surface of the anode active material from the XPS.

2. The anode active material for a lithium secondary battery of claim 1 , wherein the carbon-based particle comprises at least one selected from the group consisting of activated carbon, a carbon nanotube, a carbon nanowire, graphene, a carbon fiber, carbon black, graphite, a porous carbon, a thermally decomposed cryogel, a thermally decomposed xerogel, and a thermally decomposed aerogel.

3. The anode active material for a lithium secondary battery of claim 1 , wherein the carbon-based particle has an amorphous structure.

4. The anode active material for a lithium secondary battery of claim 1 , wherein silicon included in the silicon-containing coating layer has an amorphous structure or a crystallite size measured through an X-ray diffraction (XRD) analysis of 7 nm or less.

5. The anode active material for a lithium secondary battery of claim 2 , wherein the crystallite size of silicon included in the silicon-containing coating layer is measured by Equation 1 below:

L= 0.9λ/β cos θ  [Equation 1]

wherein, in Equation 1, L is the crystallite size (nm), λ is an X-ray wavelength (nm), β is a full width at half maximum (rad) of a (111) plane of silicon included in the silicon-containing coating layer, and θ is a diffraction angle (rad).

6. The anode active material for a lithium secondary battery of claim 1 , wherein silicon included in the silicon-containing coating layer has a peak intensity ratio of 1.2 or less in a Raman spectrum defined by Equation 2 below:

Peak intensity ratio of Raman spectrum= I (515)/ I (480)  [Equation 2]

wherein, in Equation 2, I(515) is a peak intensity of silicon included in the silicon-containing coating layer in a region having a wavenumber of 515 cm −1 in the Raman spectrum, and I(480) is a peak intensity of silicon included in the silicon-containing coating layer in a region having a wavenumber of 480 cm −1 in the Raman spectrum.

7. The anode active material for a lithium secondary battery of claim 1 , wherein the carbon coating layer is also formed on where the silicon-containing coating layer is not formed among the inside of the pores and the surface of the carbon-based particle.

8. The anode active material for a lithium secondary battery of claim 1 , wherein the FWHM of the O1s peak of the surface measured by the XPS is 2.4 or more.

9. A lithium secondary battery, comprising:

an anode comprising the anode active material for a lithium secondary battery of claim 1 ; and

a cathode facing the anode.