Positive Electrode and Lithium Secondary Battery Comprising Same

원문 (중국어)

A positive electrode includes a positive electrode current collector, a first positive electrode active material layer formed on one or both sides of the positive electrode current collector, and a second positive electrode active material layer formed on the first positive electrode active material layer. The first and second positive electrode active material layers each comprise lithium iron phosphate, a conductive material, a fluorine-based binder, a rubber-based binder, and a rubber-based dispersant. A ratio (P2/P1) of a weight P2 of fluorine contained in the second positive electrode active material layer to a weight P1 of fluorine contained in the first positive electrode active material layer is 1 or less. A weight (A) of the first positive electrode active material layer ranges from 17% to 99% of a total weight (A+B) of the first and second positive electrode active material layers. Also provided is a lithium secondary battery including the same.