The present disclosure relates to a positive electrode material including a spinel-structured lithium manganese-based first positive electrode active material and a lithium nickel-manganese-cobalt-based second positive electrode active material, wherein the first positive electrode active material includes a lithium manganese oxide represented by Formula 1 and a coating layer which is disposed on a surface of the lithium manganese oxide, the second positive electrode active material is represented by Formula 2, and an average particle diameter of the second positive electrode active material is greater than an average particle diameter of the first positive electrode active material, and a positive electrode and a lithium secondary battery which include the positive electrode material:
Li.sub.1+aMn.sub.2−bM.sup.1.sub.bO.sub.4−cA.sub.c  [Formula 1]
Li.sub.1+x[Ni.sub.yCo.sub.zMn.sub.wM.sup.2.sub.v]O.sub.2−pB.sub.p  [Formula 2]

The present invention relates to a cathode active material for a lithium secondary battery, and more particularly, to a cathode active material for a lithium secondary battery, which includes a core portion and a shell portion surrounding the core portion, in which a total content of cobalt in the core portion and the shell portion is 5 to 12 mol %, and the content of cobalt in the core portion and the shell portion is adjusted to be within a predetermined range. In the cathode active material precursor and the cathode active material for a secondary battery prepared using the same according to the present invention, optimal capacity of a lithium secondary battery may be increased by adjusting the cobalt content in the particles of the cathode active material, and life characteristics may be enhanced by improving stability.

The present invention relates to a cathode active material for a lithium secondary battery, and more particularly, to a cathode active material for a lithium secondary battery, which includes a core portion and a shell portion surrounding the core portion, in which a total content of cobalt in the core portion and the shell portion is 5 to 12 mol %, and the content of cobalt in the core portion and the shell portion is adjusted to be within a predetermined range. In the cathode active material precursor and the cathode active material for a secondary battery prepared using the same according to the present invention, optimal capacity of a lithium secondary battery may be increased by adjusting the cobalt content in the particles of the cathode active material, and life characteristics may be enhanced by improving stability.

A process for preparing a cathode material of the form Li.sub.aMn.sub.1-x-y-zFe.sub.xCo.sub.yNi.sub.zO.sub.2-dCl.sub.d is provided. In addition, a Li.sub.aMn.sub.1-x-y-zFe.sub.xCo.sub.yNi.sub.zO.sub.2-dCl.sub.d cathode material for electrochemical systems is provided. Furthermore, a lithium or lithium-ion rechargeable electrochemical cell is provided, incorporating the Li.sub.aMn.sub.1-x-y-zFe.sub.xCo.sub.yNi.sub.zO.sub.2-dCl.sub.d cathode material in a positive electrode.

A positive electrode for a lithium secondary battery includes a positive activation material mixture that intercalates and de-intercalates lithium ions, wherein a first positive activation material having an average particle diameter D50 of from 12.5 μm to 22 μm and a second positive activation material having an average particle diameter D50 of from 1 μm to 5 μm are mixed with a weight ratio of from 95:5 to 60:40.

A positive electrode for a lithium secondary battery includes a positive activation material mixture that intercalates and de-intercalates lithium ions, wherein a first positive activation material having an average particle diameter D50 of from 12.5 μm to 22 μm and a second positive activation material having an average particle diameter D50 of from 1 μm to 5 μm are mixed with a weight ratio of from 95:5 to 60:40.

A positive electrode active material for a lithium secondary battery includes a primary particle containing a spinel phase and a layered rock-salt phase. The spinel phase is formed of a nickel-and-manganese-containing composite oxide having a spinel crystal structure that includes lithium, nickel, and manganese. The layered rock-salt phase is formed of a transition metal composite oxide having a layered rock-salt crystal structure that includes lithium and at least one transition metal element. The nickel-and-manganese-containing composite oxide contains oxygen and fluorine. The transition metal composite oxide includes oxygen and fluorine.

A positive electrode active material for a lithium secondary battery includes a primary particle containing a spinel phase and a layered rock-salt phase. The spinel phase is formed of a nickel-and-manganese-containing composite oxide having a spinel crystal structure that includes lithium, nickel, and manganese. The layered rock-salt phase is formed of a transition metal composite oxide having a layered rock-salt crystal structure that includes lithium and at least one transition metal element. The nickel-and-manganese-containing composite oxide contains oxygen and fluorine. The transition metal composite oxide includes oxygen and fluorine.

The present application relates to a secondary battery, a method for manufacturing the same and an apparatus containing the same. Specifically, in the secondary battery, the first negative electrode film comprises a first negative electrode active material, the second negative electrode film comprises a second negative electrode active material. The first negative electrode active material comprises natural graphite and satisfies: 12%≤A≤18%; the second negative electrode active material comprises artificial graphite and satisfies: 20%≤B≤30%; A is a resilience rate of the first negative electrode active material measured under an action force of 15,000 N, and B is a resilience rate of the second negative electrode active material measured under an action force of 15,000 N. The secondary battery of the present application can have better kinetic performance and better high-temperature storage performance while maintaining higher energy density.

The present application relates to a secondary battery, a method for manufacturing the same and an apparatus containing the same. Specifically, in the secondary battery, the first negative electrode film comprises a first negative electrode active material, the second negative electrode film comprises a second negative electrode active material. The first negative electrode active material comprises natural graphite and satisfies: 12%≤A≤18%; the second negative electrode active material comprises artificial graphite and satisfies: 20%≤B≤30%; A is a resilience rate of the first negative electrode active material measured under an action force of 15,000 N, and B is a resilience rate of the second negative electrode active material measured under an action force of 15,000 N. The secondary battery of the present application can have better kinetic performance and better high-temperature storage performance while maintaining higher energy density.