POSITIVE ELECTRODE MATERIAL FOR A LITHIUM SECONDARY BATTERY FOR IMPROVING OUTPUT, AND LITHIUM SECONDARY BATTERY COMPRISING SAME

摘要

The present invention relates to a positive electrode active material for improving output and to a lithium secondary battery comprising same. More particularly, the present invention relates to a high-capacity positive electrode active material and to a lithium secondary battery comprising same, wherein graphite and conductive carbon, the particles of which have different shapes and sizes, are simultaneously coated as a conductive material to a mixture positive electrode material of layered ternary metal oxide containing lithium expressed by the following [chemical formula 1] and LiFePO4 having an olivine structure, thus improving expression of high resistance and insufficiency of conductivity of the ternary metal oxide containing lithium, caused by the difference in particle size or surface area between the ternary metal oxide containing lithium expressed by the following [chemical formula 1] and LiFePO4 having an olivine structure. Thus, the problem of the low output of the positive electrode active material containing the positive material may be improved, and simultaneously the positive electrode active material has a wide available SOC region. [Chemical formula 1] Li1+aNixCoyMn1-x-yO2, 0=a<0.5, 0