Anode for secondary battery and lithium secondary battery including the same

An anode for a secondary battery, the anode comprising:

• a current collector;
• a first anode mixture layer formed on at least one surface of the current collector;
• and
• a second anode mixture layer formed on the first anode mixture layer,
• wherein the first anode mixture layer and the second anode mixture layer include a silicon-based active material, respectively,
• the first anode mixture layer includes a first carbon-based active material,
• the second anode mixture layer includes a second carbon-based active material,
• the first carbon-based active material has an OI value according to Equation 1, greater than or equal to an OI value of the second carbon-based active material, and
• O
• ⁢
• I
• =
• I
• 0
• ⁢
• 0
• ⁢
• 4
• /
• I
• 1
• ⁢
• 1
• ⁢
• 0
• ,
• [
• Equation
• ⁢
• 1
• ]
• in Equation 1, OI represents an orientation index according to an XRD measurement, I004 represents a peak intensity of (004) plane when the XRD measurement is performed on a carbon-based active material, and I110 represents a peak intensity of (110) plane when the XRD measurement is performed on the carbon-based active material,
• wherein
• a Raman R value is represented by Equation 2 below,
• a Raman R value of the first carbon-based active material is less than or equal to a Raman R value of the second carbon-based active material, and
• Raman
• ⁢
• R
• =
• I
• D
• /
• I
• G
• ,
• [
• Equation
• ⁢
• 2
• ]
• in Equation 2, ID represents a peak intensity value in an absorption region of 1350 to 1380 cm−1, and IG represents a peak intensity value in an absorption region of 1580 to 1600 cm−1, and
• wherein
• the first carbon-based active material has a Raman R value of 0.20 to 0.27, and
• the second carbon-based active material has a Raman R value of 0.27 to 0.35.

An anode for a secondary battery, the anode comprising:

• a current collector;
• a first anode mixture layer formed on at least one surface of the current collector;
• and
• a second anode mixture layer formed on the first anode mixture layer,
• wherein the first anode mixture layer and the second anode mixture layer include a silicon-based active material, respectively,
• the first anode mixture layer includes a first carbon-based active material,
• the second anode mixture layer includes a second carbon-based active material,
• the first carbon-based active material has an OI value according to Equation 1, greater than or equal to an OI value of the second carbon-based active material, and
• O
• ⁢
• I
• =
• I
• 0
• ⁢
• 0
• ⁢
• 4
• /
• I
• 1
• ⁢
• 1
• ⁢
• 0
• ,
• [
• Equation
• ⁢
• 1
• ]
• in Equation 1, OI represents an orientation index according to an XRD measurement, I004 represents a peak intensity of (004) plane when the XRD measurement is performed on a carbon-based active material, and I110 represents a peak intensity of (110) plane when the XRD measurement is performed on the carbon-based active material,
• wherein
• the first anode mixture layer further includes a first conductive material,
• the second anode mixture layer further includes a second conductive material, and
• the first conductive material and the second conductive material are different from each other, and
• wherein
• a Raman R value is represented by Equation 2 below,
• a Raman R value of the first conductive material is greater than or equal to a Raman R value of the second conductive material, and
• Raman
• ⁢
• R
• =
• I
• D
• /
• I
• G
• ,
• [
• Equation
• ⁢
• 2
• ]
• In in Equation 2, ID represents a peak intensity value in an absorption region of 1350 to 1380 cm−1, and IG represents a peak intensity value in an absorption region of 1580 to 1600 cm−1.