Positive electrode active material, manufacturing method thereof, and positive electrode for lithium secondary battery comprising the same
AssigneeSK On Co., Ltd.
InventorsSang Han Lee, Sang Wook Lee, Byoung Beom Lim, Yong Hyun Cho
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Abstract
A positive electrode active material may include a lithium layer doped with a first doping element and a transition metal layer doped with a second doping element. An I(003)/I(006) peak intensity ratio in X-ray diffraction measurement is equal to or less than 23.8.
Claims9
A positive electrode active material comprising a lithium layer doped with a first doping element and a transition metal layer doped with a second doping element, wherein an I(003)/I(006) peak intensity ratio in X-ray diffraction measurement is equal to or less than 23.8,
- wherein the first doping element is one or more elements selected from the group consisting of Mg, V, Cr, Cu, Zn, and Ge, and wherein the second doping element is one or more elements selected from the group consisting of Ti, Fe, As, Zr, Al, Nb, Mo, Tc, Ru, Rh, Pd, V, and Te,
- wherein the first doping element and the second doping element are an element having a hexacoordinate structure,
- wherein the first doping element has an oxidation number of +1 to +2, and
- wherein the second doping element has an oxidation number of +2 to +4 and wherein the positive electrode active material has a crystal grain size of 250 nm to 1000 nm.
A manufacturing method of a positive electrode active material, comprising the steps of:
- mixing a lithium compound, a transition metal compound, a compound comprising a first doping element doped into lithium, and a compound comprising a second doping element doped into a transition metal;
- and
- calcining a mixture obtained in the mixing such that an I(003)/I(006) peak intensity ratio in X-ray diffraction measurement of a final product is equal to or less than 23.8,
- wherein the first doping element is one or more elements selected from the group consisting of Mg, V, Cr, Cu, Zn, and Ge, and wherein the second doping element is one or more elements selected from the group consisting of Ti, Fe, As, Zr, Al, Nb, Mo, Tc, Ru, Rh, Pd, V, and Te,
- wherein the first doping element and the second doping element are an element having a hexacoordinate structure,
- wherein the first doping element has an oxidation number of +1 to +2, and
- wherein the second doping element has an oxidation number of +2 to +4and wherein the positive electrode active material has a crystal grain size of 250 nm to 1000 nm.
A positive electrode for lithium secondary batteries, comprising:
- a positive electrode current collector;
- and
- a positive electrode active material layer disposed on the positive electrode current collector,
- wherein the positive electrode active material layer comprises a lithium layer doped with a first doping element and a transition metal layer doped with a second doping element;
- and a positive electrode active material of which an I(003)/I(006) peak intensity ratio in X-ray diffraction measurement is equal to or less than 23.8,
- wherein the first doping element is one or more elements selected from the group consisting of Mg, V, Cr, Cu, Zn, and Ge, and wherein the second doping element is one or more elements selected from the group consisting of Ti, Fe, As, Zr, Al, Nb, Mo, Tc, Ru, Rh, Pd, V, and Te,
- wherein the first doping element and the second doping element are an element having a hexacoordinate structure,
- wherein the first doping element has an oxidation number of +1 to +2, and
- wherein the second doping element has an oxidation number of +2 to +4 and wherein the positive electrode active material has a crystal grain size of 250 nm to 1000 nm.
Dependencies are inferred from the claim text.