| abstract |
The powder of the layered lithium-nickel-manganese-cobalt-based composite oxide for the positive electrode material of the lithium secondary battery used for the positive electrode material of the lithium secondary battery can improve battery performance as well as cost reduction and stability. Provided is a powder of a layered lithium-nickel-manganese-cobalt-based composite oxide for the positive electrode material of a lithium secondary battery, which is made into secondary particles by agglomeration of primary particles. The composition of the composite oxide is represented by the following formula: Li 1 + z Ni x Mn y Co 1 -X- Y O δ (I), where 0 <z≤0.91, 0.1≤x≤0.55, 0.20≤y≤0.90 , 0.50 ≦ x + y ≦ 1, and 1.9 ≦ δ ≦ 3). It has a volume resistivity of 5 × 10 5 Ω · cm or less in a compressed state at a pressure of 40 MPa. C is the carbon content concentration (% by weight), S is the BET specific surface area (m 2 / g), and the C / S value is 0.025 or less. Within a limited composition range, the volume resistivity can be reduced below a certain value, and the concentration of carbon obtained can be significantly lowered to enhance battery performance as well as cost reduction and high stability. |