Positive electrode for rechargeable lithium battery and rechargeable lithium battery including the same
In an aspect, a positive electrode for a lithium rechargeable battery including a current collector; a positive active material layer disposed on the current collector, wherein the positive active material layer includes a positive active material, active carbon, and an additive.
1. A positive electrode for a rechargeable lithium battery, comprising:
a current collector; and
a positive active material layer disposed on the current collector,
wherein the positive active material layer comprises
a positive active material including a lithium metal oxide, wherein the lithium metal oxide is lithium cobalt oxide, or lithium nickel cobalt manganese oxide;
active carbon comprising particles having an average diameter of about 1 to about 30 μm;
a conductive material, wherein the conductive material is carbon black; and
an additive including a transition metal oxide, wherein the additive comprises particles having an average diameter of about 0.01 to about 20 μm and wherein the transition metal oxide is Mn 3 O 4 and comprising from about 0.01 to about 15 wt % of said additive, based on the total weight of the positive active material layer.
2. The positive electrode of claim 1 , wherein the transition metal oxide is Mn 3 O 4 .
3. The positive electrode of claim 1 , comprising from about 0.05 to about 3 wt % of said additive, based on the total weight of the positive active material layer.
4. The positive electrode of claim 1 , wherein the lithium metal oxide is lithium cobalt oxide.
5. The positive electrode of claim 1 , comprising from about 65 wt % to about 90 wt % of said positive active material, based on the total weight of the positive active material layer.
6. The positive electrode of claim 1 , comprising from about 1 wt % to about 30 wt % of said active carbon, based on the total weight of the positive active material layer.
7. The positive electrode of claim 6 , comprising from about 3 wt % to about 10 wt % of said active carbon, based on the total weight of the positive active material layer.
8. The positive electrode of claim 1 , wherein the active carbon comprises particles having an average diameter of about 5 to about 10 μm.
9. The positive electrode of claim 1 , wherein the additive comprises particles having an average diameter of about 0.01 to about 1 μm.
10. The positive electrode of claim 9 , wherein the additive comprises particles having an average diameter of about 0.1 to about 1 μm.
11. The positive electrode of claim 1 , wherein the weight ratio of the active carbon to the additive is from 1:0.03 to 1:0.3.
12. A rechargeable lithium battery, comprising
the positive electrode of claim 1 ;
a negative electrode comprising a negative active material; and
a non-aqueous electrolyte.
13. The rechargeable lithium battery of claim 1 , wherein the additive comprises particles having an average diameter of about 0.1 to about 1 μm.
14. The rechargeable lithium battery of claim 13 , comprising from about 0.05 to about 3 wt % of said additive, based on the total weight of the positive active material layer.
15. The rechargeable lithium battery of claim 1 , wherein the lithium metal oxide is lithium cobalt oxide.