Negative electrode for a rechargeable lithium battery and rechargeable lithium battery comprising same
A negative electrode for a rechargeable lithium battery may include a negative electrode active mass layer including a negative active material having a Young's modulus of about 10 GPa to about 35 GPa and having an active mass density of greater than or equal to about 1.65 g/cc and a current density of greater than or equal to about 3.2 mAh/cm 2 .
1. A negative electrode for a rechargeable lithium battery, the negative electrode consisting of:
a current collector;
a layer of an active mass that includes a mixture of a negative active material and a binder, wherein:
the negative active material in the layer of the active mass has a Young's modulus of about 10 GPa to about 35 GPa,
the layer of the active mass has an active mass density of about 1.65 g/cc to about 1.85 g/cc, the active mass density indicating weight of the active mass divided by volume of the negative electrode, and
the negative electrode exhibits a current density of greater than or equal to about 3.2 mAh/cm 2 .
2. The negative electrode as claimed in claim 1 , wherein the current density of the negative electrode is about 3.2 mAh/cm 2 to about 4.2 mAh/cm 2 .
3. The negative electrode as claimed in claim 1 , wherein the Young's modulus of the negative active material is about 15 GPa to about 25 GPa.
4. The negative electrode as claimed in claim 1 , wherein the negative active material is artificial graphite.
5. A rechargeable lithium battery comprising:
the negative electrode as claimed in claim 1 ;
a positive electrode including a positive active material; and
an electrolyte.
6. The rechargeable lithium battery as claimed in claim 5 , wherein the active mass density of the negative electrode is about 1.65 g/cc to about 1.85 g/cc.
7. The rechargeable lithium battery as claimed in claim 5 , wherein the current density of the negative electrode is about 3.2 mAh/cm 2 to about 4.2 mAh/cm 2 .
8. The rechargeable lithium battery as claimed in claim 5 , wherein the Young's modulus of the negative active material is about 15 GPa to about 25 GPa.
9. The rechargeable lithium battery as claimed in claim 5 , wherein the negative active material is artificial graphite.