| abstract |
An object of the present invention is to provide a mixed active material for a lithium secondary battery in which both battery capacity and cycle characteristics are improved, an electrode using the mixed active material, and a lithium secondary battery. The present invention relates to a lithium transition metal composite oxide having an α-NaFeO 2 structure, a transition metal (Me) containing Co, Ni and Mn, and a molar ratio Mn / Me> Mn / Me> 0.5, and And a lithium transition metal composite oxide having an α-NaFeO 2 structure, the transition metal (Me) containing Co, Ni, and Mn, and the molar ratio Mn / Me being 0 <Mn / Me ≦ 0.5. A mixed active material for a lithium secondary battery having a specific surface area of 4.4 m 2 / g or less and an S content of 0.2 to 1.2% by mass. It is related to. |