Lithium nickel cobalt manganese composite oxide positive electrode material having a spherical or similar spherical layer structure, manufacturing method, positive electrode, lithium ion battery, energy storage power plant or portable memory equipment, and use

摘要

The present invention discloses a spherical or spherical-like layered structure lithium-nickel-cobalt-manganese composite oxide cathode material as well as preparation methods and applications thereof. A chemical formula of the cathode material is: Li a Ni x Co y Mn z O 2 , wherein 1.0 ‰¦ a ‰¦ 1.2, 0.30 ‰¦ x ‰¦ 0.90, 0.05 ‰¦ y ‰¦ 0.40, 0.05 ‰¦ z ‰¦ 0.50, and x + y + z = 1. The cathode material powder is a single ±-NaFeO 2 type layered structure, and full width at half maximum of 110 diffraction peak which is in the vicinity of the X-ray diffraction angle 2 theta of 64.9° is usually 0.07 to 0.15, and the crystal grain size is usually greater than 900Å and less than 2000Å. Under scanning electron microscope, it can be seen that the cathode material is mainly consisted of spherical or spherical-like primary mono-crystal particles and a small amount of secondary agglomerated particles, and wherein, the particle diameter of the primary mono-crystal particles is 0.5 to 10 µm and a cumulative percentage of particles with a particle diameter of less than 0.5 µm is usually greater than 60%. The cathode material provided by the present invention has an integral structure and will not crack or break in a long process of circulation. The material processing performance is good. And the lithium ion battery prepared has excellent high temperature stability, safety and high voltage cycling performance.