Abstract: The present invention relates to a positive electrode active material, in which primary particles included in a secondary particle exhibit an aspect ratio gradient which gradually increases from the center of the secondary particle to the surface thereof, and a lithium secondary battery which uses a positive electrode containing the positive electrode active material.

Abstract: The present invention relates to a lithium composite oxide, a positive electrode active material for a lithium secondary battery including the lithium composite oxide, and a lithium secondary battery using a positive electrode including the positive electrode active material.

Abstract: The present invention relates to a lithium metal complex oxide and a preparation method thereof, and more particularly, to a lithium metal complex oxide mixed with a metal compound for a lithium reaction, stirred and heat-treated to allow residual lithium and a metal compound for reducing lithium (or a metal compound for lithium reduction) to react with each other on a surface to form a product, which is included in the lithium metal complex oxide, in which the content of Ni3+ is higher than the content of Ni2+ and a ratio of Ni3+/Ni2+ is 1.5 or greater so that life characteristics and capacity characteristics are improved, while residual lithium is reduced, and a preparation method thereof.

Abstract: The present invention relates to a positive electrode active material and a lithium secondary battery comprising the same.

Abstract: The present invention relates to a positive electrode active material comprising an overlithiated layered oxide (OLO) and, more specifically, to a positive electrode active material comprising: an OLO represented by chemical formula 1 below; and an amorphous free oxide coating layer of an amorphous free oxide on the surface of the OLO represented by chemical formula 1. [Chemical formula 1] Li2MnO3.(1-r)LiaNixCoyMnzM11-(x+y+z)O2 (wherein, in chemical formula 1, 0<r?0.6, 0<a?1, 0?x?1, 0?y<1, 0?z<1, and 0<x+y+z?1, and M1 is at least any one selected from Na, K, Mg, Al, Fe, Cr, Y, Sn, Ti, B, P, Zr, Ru, Nb, W, Ba, Sr, La, Ga, Mg, Gd, Sm, Ca, Ce, Fe, Al, Ta, Mo, Sc, V, Zn, Cu, In, S, B, Ge, Si, and Bi).

Abstract: The present invention comprises: an overlithiated layered oxide represented by chemical formula 1 below; and an ion-conductive coating layer on the overlithiated layered oxide represented by chemical formula 1: [chemical formula 1] rLi2MnO3·(1-r)LiaNixCoyMnzM11?(x+y+z)O2 (in chemical formula 1, 0<r?0.6, 0<a?1, 0?x?1, 0?y<1, 0?z<1, and 0<x+y+z<1, and M1 is at least one selected from among Na, K, Mg, Al, Fe, Cr, Y, Sn, Ti, B, P, Zr, Ru, Nb, W, Ba, Sr, La, Ga, Mg, Gd, Sm, Ca, Ce, Fe, Al, Ta, Mo, Sc, V, Zn, Cu, In, S, B, Ge, Si, and Bi).

Abstract: The present invention comprises, in lithium composite oxide particles, an overlithiated oxide having a layered crystal structure and represented by chemical formula 1 below, and comprises a lithium manganese oxide represented by chemical formula 2 below outside the lithium composite oxide particles, wherein the overlithiated oxide included in the particles and the lithium manganese oxide included outside the particles have different Li/IM values. [Chemical formula 1] rLi2MnO3.(1-r)LiaNixCoyMnzM11-(x+y+z)O2 (wherein, in chemical formula 1, 0<r?0.6, 0<a?1, 0?x?1, 0?y<1, 0?z<1, and 0<x+y+z?1, and M1 is at least any one selected from Na, K, Mg, Al, Fe, Cr, Y, Sn, Ti, B, P, Zr, Ru, Nb, W, Ba, Sr, La, Ga, Mg, Gd, Sin, Ca, Ce, Fe, Al, Ta, Mo, Se, Zn, Nb, Cu, in, S, B, and Bi) [Chemical formula 2] LibMnpOq (wherein, in chemical formula 2, 0.1?b/p?2.5 and 0<q?15).

Abstract: The present invention relates to a lithium metal complex oxide and a preparation method thereof, and more particularly, to a lithium metal complex oxide mixed with a metal compound for a lithium reaction, stirred and heat-treated to allow residual lithium and a metal compound for reducing lithium (or a metal compound for lithium reduction) to react with each other on a surface to form a product, which is included in the lithium metal complex oxide, in which the content of Ni3+ is higher than the content of Ni2+ and a ratio of Ni3+/Ni2+ is 1.5 or greater so that life characteristics and capacity characteristics are improved, while residual lithium is reduced, and a preparation method thereof.

Abstract: The present invention relates to a lithium composite oxide, a positive electrode active material for a lithium secondary battery including the lithium composite oxide, and a lithium secondary battery using a positive electrode including the positive electrode active material.

Abstract: The present invention relates to a positive electrode active material and a lithium secondary battery comprising the same.

Abstract: The present invention relates to a lithium composite oxide, a positive electrode active material for a lithium secondary battery including the lithium composite oxide, and a lithium secondary battery using a positive electrode including the positive electrode active material.

Abstract: The present invention relates to a positive electrode active material and a lithium secondary battery comprising the same.

Abstract: The present disclosure is related to a positive electrode active material for lithium secondary batteries, a method for preparing the positive electrode active material, and a lithium secondary battery including the positive electrode active material. The positive electrode active material for lithium secondary batteries includes an overlithiated layered oxide (OLO), and the overlithiated layered oxide includes primary particles having a size in a range of 300 nm to 10 ?m in an amount ranging from 50 to 100% by volume with respect to the total overlithiated layered oxide.

Abstract: The present invention relates to a positive electrode active material, in which primary particles included in a secondary particle exhibit an aspect ratio gradient which gradually increases from the center of the secondary particle to the surface thereof, and a lithium secondary battery which uses a positive electrode containing the positive electrode active material.

Abstract: The present invention relates to a cathode active material for a secondary battery and a preparation method thereof, and more particularly, to a lithium composite oxide including a secondary particle formed as primary particles cohere, in which a manganese (Mn) oxide is present in the periphery of the primary particles, a concentration of an Mn oxide in the primary particle has a concentration gradient from the center of the primary particle to a surface of the particle, a concentration of an Mn oxide in the secondary particle has a concentration gradient from a surface of the secondary particle to the center thereof, and a lithium ion migration path is formed in the primary particle, and a preparation method thereof. A secondary battery including the cathode active material for a secondary battery may have high safety, while exhibiting high capacity and high output.

Abstract: The present invention relates to a positive electrode active material for a lithium secondary battery and a lithium secondary battery including the same. The positive electrode active material according to the present invention reduces the specific surface area and grain boundary of a secondary particle in which a side reaction with an electrolyte solution occurs to improve the high-temperature stability of the positive electrode active material and reduce gas generation caused by the positive electrode active material.

Abstract: The present invention relates to a lithium composite oxide, a positive electrode active material for a lithium secondary battery including the lithium composite oxide, and a lithium secondary battery using a positive electrode including the positive electrode active material.

Abstract: The present invention relates to a positive electrode active material and a lithium secondary battery comprising the same.

Abstract: The present invention relates to a positive electrode active material, and a lithium secondary battery comprising a positive electrode including the positive electrode active material.

Abstract: The present invention relates to a lithium metal complex oxide and a preparation method thereof, and more particularly, to a lithium metal complex oxide mixed with a metal compound for a lithium reaction, stirred and heat-treated to allow residual lithium and a metal compound for reducing lithium (or a metal compound for lithium reduction) to react with each other on a surface to form a product, which is included in the lithium metal complex oxide, in which the content of Ni3+ is higher than the content of Ni2+ and a ratio of Ni3+/Ni2+ is 1.5 or greater so that life characteristics and capacity characteristics are improved, while residual lithium is reduced, and a preparation method thereof.