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 stable Li.sub.xMn.sub.2-yMe.sub.yO.sub.4-zCl.sub.z material with a MO.sub.b or MMn.sub.aO.sub.b charge transfer catalyst coating is provided, where Me is Fe, Co, or Ni and M is Bi, As, or Sb. In addition, a Li.sub.xMn.sub.2-yMe.sub.yO.sub.4-zCl.sub.z material with a MO.sub.b or MMn.sub.aO.sub.b charge transfer catalyst coating is provided. Furthermore, a lithium or lithium ion rechargeable electrochemical cell is provided, which includes a cathode material (in a positive electrode) containing a Li.sub.xMn.sub.2-yMe.sub.yO.sub.4-zCl.sub.z material with a MO.sub.b or MMn.sub.aO.sub.b charge transfer catalyst coating.

A process for preparing a stable Li.sub.xMn.sub.2-yMe.sub.yO.sub.4-zCl.sub.z material with a MO.sub.b or MMn.sub.aO.sub.b charge transfer catalyst coating is provided, where Me is Fe, Co, or Ni and M is Bi, As, or Sb. In addition, a Li.sub.xMn.sub.2-yMe.sub.yO.sub.4-zCl.sub.z material with a MO.sub.b or MMn.sub.aO.sub.b charge transfer catalyst coating is provided. Furthermore, a lithium or lithium ion rechargeable electrochemical cell is provided, which includes a cathode material (in a positive electrode) containing a Li.sub.xMn.sub.2-yMe.sub.yO.sub.4-zCl.sub.z material with a MO.sub.b or MMn.sub.aO.sub.b charge transfer catalyst coating.

A positive-electrode active material for a non-aqueous electrolyte secondary battery according to the present disclosure contains a layered lithium (Li)-containing transition metal composite oxide that contains Li in the transition metal layer and more than 0.4 μmol/g and less than 25 μmol/g of iodine (I) or bromine (Br).

A positive-electrode active material for a non-aqueous electrolyte secondary battery according to the present disclosure contains a layered lithium (Li)-containing transition metal composite oxide that contains Li in the transition metal layer and more than 0.4 μmol/g and less than 25 μmol/g of iodine (I) or bromine (Br).

A doped spinel comprising the formula:
Li.sub.1±wMe1.sub.vMe2.sub.x-vMn.sub.2-x-yTiyO.sub.4-zF.sub.z
where, 0≦w<1, 0.3<x≦0.7, 0.3≦v<0.7, x>v, 0.0001≦y≦0.35, and 0.0001≦z≦0.3. Me1 is a metal selected from a group of elements consisting of Cr, Fe, Co, Ni, Cu, and Zn. Me2 is a metal selected from a group of elements consisting of Ni, Fe, Co, Mg, Cr, V, Ru, Mg, Al, Zn, Cu, Cd, Ag, Y, Sc, Ga, In, As, Sb, Pt, Au, and B.

A doped spinel comprising the formula:
Li.sub.1±wMe1.sub.vMe2.sub.x-vMn.sub.2-x-yTiyO.sub.4-zF.sub.z
where, 0≦w<1, 0.3<x≦0.7, 0.3≦v<0.7, x>v, 0.0001≦y≦0.35, and 0.0001≦z≦0.3. Me1 is a metal selected from a group of elements consisting of Cr, Fe, Co, Ni, Cu, and Zn. Me2 is a metal selected from a group of elements consisting of Ni, Fe, Co, Mg, Cr, V, Ru, Mg, Al, Zn, Cu, Cd, Ag, Y, Sc, Ga, In, As, Sb, Pt, Au, and B.

The present invention is a lithium-phosphorus-based composite oxide/carbon composite used for a positive electrode active material of an electrochemical device, including lithium-phosphorus-based composite oxide with the surface being coated with carbon, wherein the lithium-phosphorus-based composite oxide/carbon composite has elutable fluoride ions, which are eluted to an elute from the composite dispersed to ultrapure water, in a mass ratio of 500 ppm or more and 15000 ppm or less in comparison with the lithium-phosphorus-based composite oxide/carbon composite, and the lithium-phosphorus-based composite oxide has a composition of the following general formula (1):

Li.sub.1-xFe.sub.1-zM.sub.zPO.sub.4-aF.sub.a(−0.1≦x<1,0≦z≦1,0≦a≦4)  (1)

(wherein, M represents one or more kinds of metal element selected from the group of Mn, Ni, Co, V, Cr, Al, Nb, Ti, Cu, and Zn). This provides a lithium-phosphorus-based composite oxide/carbon composite that gives higher charge/discharge capacity when it is used as a positive electrode active material of an electrochemical device even though a trivalent-containing raw material is used.

The present invention is a lithium-phosphorus-based composite oxide/carbon composite used for a positive electrode active material of an electrochemical device, including lithium-phosphorus-based composite oxide with the surface being coated with carbon, wherein the lithium-phosphorus-based composite oxide/carbon composite has elutable fluoride ions, which are eluted to an elute from the composite dispersed to ultrapure water, in a mass ratio of 500 ppm or more and 15000 ppm or less in comparison with the lithium-phosphorus-based composite oxide/carbon composite, and the lithium-phosphorus-based composite oxide has a composition of the following general formula (1):

Li.sub.1-xFe.sub.1-zM.sub.zPO.sub.4-aF.sub.a(−0.1≦x<1,0≦z≦1,0≦a≦4)  (1)

(wherein, M represents one or more kinds of metal element selected from the group of Mn, Ni, Co, V, Cr, Al, Nb, Ti, Cu, and Zn). This provides a lithium-phosphorus-based composite oxide/carbon composite that gives higher charge/discharge capacity when it is used as a positive electrode active material of an electrochemical device even though a trivalent-containing raw material is used.