LITHIUM SECONDARY BATTERY

Abstract

The present invention relates to a lithium secondary battery comprising a positive electrode comprising a layer of positive electrode active material comprising a single particle type positive electrode active material, a positive electrode conductive material, a positive electrode binder, and a positive electrode dispersant, a negative electrode, and an electrolyte, wherein the negative electrode comprises a first layer of negative electrode active material formed on a negative electrode current collector and comprising a first negative electrode active material, a first negative electrode conductive material, and a first negative electrode binder, and a second layer of negative electrode active material formed on the first layer of negative electrode active material and comprising a second negative electrode active material, a second negative electrode conductive material, and a second negative electrode binder,wherein the ratio of the binder content of the first negative electrode to the binder content of the second negative electrode is 1.5 to 3.0, and the difference in porosity between the positive electrode and the negative electrode is 4.2% to 9.8%, and the positive electrode has an FBR value, defined by Equation 1 below, of 30 to 180.[Equation 1]FBR = [(Rb × TDb) + (Rd × TDd)] × A2,