Patent ID: 8734993

Claim:
An electrode assembly comprising a positive electrode, a negative electrode and a separator, wherein the positive electrode further comprises a first positive electrode active material layer, and a second positive electrode active material layer formed on one surface of the first positive electrode active material layer, the first positive electrode active material layer further comprises a first positive electrode active material containing manganese (Mn), and the second positive electrode active material layer further comprises a second positive electrode active material containing cobalt (Co), wherein the first positive electrode active material layer is formed by coating the first positive electrode active material in an amount of from about 85 wt % to about 95 wt % based on a total weight of positive electrode active material and the second positive electrode active material layer is formed by coating the second positive electrode active material in an amount of from about 5 wt % to about 15 wt % based on the total weight of positive electrode active material.