Electrode and secondary battery including the same
View Patent ↗Disclosed is an electrode for secondary batteries including an electrode mixture including an electrode active material, binder and conductive material coated on a current collector wherein a conductive material is coated to a thickness of 1 to 80 μm on the current collector and the electrode mixture is coated on a coating layer of the conductive material so as to improve electrical conductivity.
1. An anode for secondary batteries comprising:
a coating layer of a conductive material having a thickness of 30 to 80 μm on a current collector, and
an anode mixture comprising an anode active material, a binder and the same conductive material of the coating layer,
wherein the conductive material is at least one of carbon nanotube or graphene.
2. The anode according to claim 1 , wherein the coating layer is coated on 40 to 90% of a total area of the current collector.
3. The anode according to claim 1 , wherein the anode comprises a lithium metal oxide represented by Formula 3 below:
Li a M′ b O 4−c A c (3)
wherein M′ is at least one element selected from the group consisting of Ti, Sn, Cu, Pb, Sb, Zn, Fe, In, Al and Zr;
0.1≦a≦4 and 0.2≦b≦4 in which a and b are determined according to oxidation number of M′;
0≦c≦0.2 in which c is determined according to oxidation number of A; and
A is at least one monovalent or divalent anion.
4. The anode according to claim 3 , wherein the lithium metal oxide is represented by Formula 4 below:
Li a Ti b O 4 (4)
wherein 0.5≦a≦3 and 1≦b≦2.5.
5. The anode according to claim 4 , wherein the lithium metal oxide is Li 1.33 Ti 1.67 O 4 or LiTi 2 O 4 .
6. A secondary battery comprising the anode according to claim 1 .
7. The secondary battery according to claim 6 , wherein the secondary battery is a lithium secondary battery.
8. A battery module comprising the secondary battery according to claim 7 as a unit battery.
9. A battery pack comprising the battery module according to claim 8 .
10. A device comprising the battery pack according to claim 9 .
11. The device according to claim 10 , wherein the device is an electric vehicle, a hybrid electric vehicle, a plug-in hybrid electric vehicle, or a system for storing power.