HIGH-ENERGY LITHIUM SECONDARY BATTERY HAVING IMPROVED ENERGY DENSITY CHARACTERISTICS

摘要

The present invention relates to a high-energy lithium secondary battery characterized by comprising: a positive electrode including a first positive electrode active material which has a layered structure and which is expressed in chemical formula 1 in the description, and a second positive electrode active material which has a spinel structure and which is expressed in chemical formula 2, wherein the content of the first positive electrode active material is 40 to 100 wt % based on the total weight of the positive electrode active material; a negative electrode which contains an amorphous carbon and which has a capacitance of at least 300 mAh/g; and a separation film.