1. A reactor, comprising:
a coil formed with paired coil elements that are made of a spirally wound wire, the coil elements being coupled to each other in a paralleled state;
internal core portions that are fitted into the paired coil elements to structure a part of an annular core;
exposed core portions that are exposed outside the coil elements to couple the internal core portions to each other, to thereby form a rest of the annular core; and
an external resin portion that covers at least a part of an assembled product made up of the coil and the core, wherein
in each of the exposed core portions, a cut-out corner portion is provided to at least a part of a joining portion of an inner end face facing an end face of the coil and an adjacent face that is continuous to the inner end face,
the adjacent face of each of the exposed core portions is a side face adjacent to the inner end face,
the cut-out corner portion is structured with a curved surface, an arc-radius of the surface is 1 mm or more and 10 mm or less.
2. A reactor, comprising:
a coil formed with paired coil elements that are made of a spirally wound wire, the coil elements being coupled to each other in a paralleled state;
internal core portions that are fitted into the paired coil elements to structure a part of an annular core;
exposed core portions that are exposed outside the coil elements to couple the internal core portions to each other, to thereby form a rest of the annular core; and
an external resin portion that covers at least a part of an assembled product made up of the coil and the core, wherein
in each of the exposed core portions, a cut-out corner portion is provided to at least a part of a joining portion of an inner end face facing an end face of the coil and an adjacent face that is continuous to the inner end face,
the adjacent face of each of the exposed core portions is a side face adjacent to the inner end face,
the cut-out corner portion is structured with a flat surface.
3. A converter including a reactor as one of a component for the converter,
the reactor comprising:
a coil formed with paired coil elements that are made of a spirally wound wire, the coil elements being coupled to each other in a paralleled state;
internal core portions that are fitted into the paired coil elements to structure a part of an annular core;
exposed core portions that are exposed outside the coil elements to couple the internal core portions to each other, to thereby form a rest of the annular core; and
an external resin portion that covers at least a part of an assembled product made up of the coil and the core, wherein
in each of the exposed core portions, a cut-out corner portion is provided to at least a part of a joining portion of an inner end face facing an end face of the coil and an adjacent face that is continuous to the inner end face.
4. A power conversion device including the converter according to claim 3.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A cathode active material comprising:
a lithium metal oxide core represented by Formula 1 below; and
an oxide coating layer formed on the lithium metal oxide core:
LiLixMeyMzO2+d,\u2003\u2003<Formula 1>
wherein,
x+y+z=1 (0<x<0.33 and 0<z<0.1),
0\u2266d\u22660.1,
Me comprises at least one metal selected from the group consisting of Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Al, Mg, Zr, and B, and
M comprises at least one metal selected from the group consisting of Mo, W, Ir, Ni, and Mg.
2. The cathode active material of claim 1, wherein the oxide coating layer comprises at least one selected from the group consisting of a metal oxide and a metal phosphorous oxide.
3. The cathode active material of claim 1, wherein the oxide coating layer comprises a metal oxide represented by Formula 2 below,
M\u2032Op,\u2003\u2003<Formula 2>
wherein,
0<p<3, and
M\u2032 comprises at least one metal selected from the group consisting of Al, Ba, Ca, Mg, Si, Ti, Zr, Zn, Sr, and Li.
4. The cathode active material of claim 3, wherein the metal oxide comprises Al2O3, CaO, or BaO.
5. The cathode active material of claim 1, wherein the oxide coating layer comprises a metal phosphorous oxide represented by Formula 3 below:
M\u2033(PO4)q,\u2003\u2003<Formula 3>
wherein,
0<q<2, and
M\u2033 comprises at least one metal selected from the group consisting of Al, Fe, Ni, Mn, Co, and Li.
6. The cathode active material of claim 5, wherein the metal phosphorous oxide comprises AlPO4.
7. The cathode active material of claim 1, wherein a content of the oxide coating layer is 10 wt % or less of the weight of the lithium metal oxide core.
8. The cathode active material of claim 1, wherein the lithium metal oxide is represented by Formula 4 below:
LiLixMeyMozO2+d,\u2003\u2003<Formula 4>
wherein,
x+y+z=1 (0<x<0.33 and 0<z<0.1),
0\u2266d\u22660.1, and
Me comprises at least one metal selected from the group consisting of Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Al, Mg, Zr, and B.
9. The cathode active material of claim 1, wherein the lithium metal oxide is represented by Formula 5 below:
LiLixNiaCobMncMzO2+d,\u2003\u2003<Formula 5>
wherein,
x+a+b+c+z=1 (0<x<0.33, 0<z<0.1, 0<a<0.2, 0<b<0.2, and 0<c<0.6),
0\u2266d\u22660.1, and
M comprises at least one metal selected from the group consisting of Mo, W, Ir, Ni, and Mg.
10. The cathode active material of claim 1, wherein the lithium metal oxide is represented by Formula 6 below:
LiLixNiaCobMncMozO2+d,\u2003\u2003<Formula 6>
wherein,
x+a+b+c+z=1 (0<x<0.33, 0<z<0.1, 0<a<0.2, 0<b<0.2, and 0<c<0.6), and
0\u2266d\u22660.1.
11. The cathode active material of claim 10, wherein 0<z<0.05.
12. A cathode comprising the cathode active material of claim 1.
13. A lithium battery employing the cathode of claim 12.
14. A method of preparing a cathode active material, the method comprising:
preparing a mixture by mixing a lithium metal oxide of Formula 1 below, a precursor of an oxide for forming a coating layer, and a solvent; and
drying and calcinating the mixture,
wherein the oxide precursor comprises a metal oxide precursor, a metal phosphorous oxide precursor, or a mixture thereof:
LiLixMeyMzO2+d,tm <Formula 1>
wherein,
x+y+z=1 (0<x<0.33 and 0<z<0.1),
0\u2266d\u22660.1, and
Me comprises at least one metal selected from the group consisting of Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Al, Mg, Zr, and B.
15. The method of claim 14, wherein the metal oxide precursor comprises at least one compound selected from the group consisting of a metal nitride, a metal acetate, a metal alkoxide, a metal chloride, and a metal sulfide.
16. The method of claim 14, wherein the metal phosphorous oxide precursor comprises:
a phosphorous compound; and
at least one compound selected from the group consisting of a metal nitride, a metal acetate, a metal alkoxide, a metal chloride, and a metal sulfide.