POSITIVE ELECTRODE FOR A LITHIUM SECONDARY BATTERY AND A LITHIUM SECONDARY BATTERY COMPRISING THE SAME

摘要

Provided are a positive electrode for a lithium secondary battery which is increased in active mass density and is improved in the capacity per volume of a positive electrode, and a lithium secondary battery containing the positive electrode. The positive electrode comprises a positive electrode active material which can insert or desert a lithium ion and comprises a positive electrode active material having an average diameter (D50) of 12.5-22 micrometers and a positive electrode active material having an average diameter (D50) of 1-5 micrometers in a ratio of 95:5 to 60:40 by weight. Preferably the positive electrode active material comprises a positive electrode active material having an average diameter (D50) of 13-17 micrometers and a positive electrode active material having an average diameter (D50) of 2-4 micrometers in a ratio of 90:10 to 70:30 by weight.