Negative electrode for a rechargeable lithium battery and rechargeable lithium battery including the same
A negative electrode and a rechargeable lithium battery, the negative electrode including a current collector; and a negative active material layer on the current collector, the negative active material including a carbon negative active material; wherein: an electrode density of the negative electrode is in the range of about 1.0 g/cc to about 1.5 g/cc, and a DD (Degree of Divergence) value as defined by the following Equation 1 is about 24 or greater, DD (Degree of Divergence)=( I a /I total )*100 [Equation 1] wherein, in Equation 1, I a is a sum of peak intensities at non-planar angles measured by XRD using a CuKα ray, and I total is a sum of peak intensities at all angles measured by XRD using a CuKα ray.
1. A negative electrode for a rechargeable lithium battery, the negative electrode comprising:
a current collector; and
a negative active material layer on the current collector, the negative active material including a carbon negative active material;
wherein:
a DD (Degree of Divergence) value of the negative electrode, as defined by the following Equation 1, is about 24 or greater,
DD (Degree of Divergence)=( I a /I total )*100 [Equation 1]
in Equation 1:
I a is a sum of peak intensities at 2θ=42.4±0.2°, 43.4±0.2°, 44.6±0.2°, and 77.5±0.2° measured by XRD using a CuKα ray, and
I total is a sum of peak intensities at 2θ=26.5±0.2°, 42.4±0.2°, 43.4±0.2°, 44.6±0.2°, 54.7±0.2°, and 77.5±0.2° measured by XRD using a CuKα ray,
the negative electrode has an active region facing a positive electrode and an inactive region not facing the positive electrode, and
a DD value of the inactive region of the negative electrode is about 24 to about 70.
2. The negative electrode for a rechargeable lithium battery as claimed in claim 1 , wherein an electrode density of the negative electrode is in the range of about 1.0 g/cc to about 1.5 g/cc.
3. The negative electrode for a rechargeable lithium battery as claimed in claim 1 , wherein the negative electrode has a single surface loading level (L/L) of about 6 mg/cm 2 to about 65 mg/cm 2 .
4. The negative electrode for a rechargeable lithium battery as claimed in claim 1 , wherein the negative active material layer has a thickness of a single surface except a substrate of about 40 μm to about 650 μm.
5. The negative electrode for a rechargeable lithium battery as claimed in claim 1 , wherein the peak intensities are peak integral area values.
6. The negative electrode for a rechargeable lithium battery as claimed in claim 1 , wherein the carbon negative active material is artificial graphite or a mixture of artificial graphite and natural graphite.
7. The negative electrode for a rechargeable lithium battery as claimed in claim 1 , wherein the negative active material layer further includes a Si negative active material, a Sn negative active material, a lithium vanadium oxide, or a combination thereof.
8. A rechargeable lithium battery, comprising:
the negative electrode as claimed in claim 1 ;
a positive electrode; and
an electrolyte.