Ecopro Bm Co., Ltd.

Samsung Sdi Co., Inc.

Ecopro Co. Ltd.

Moon Ho Choi

Hyun Jong Yu

Jin Kyeong Yun

Suk Yong Jeon

Seung Woo Choi

Jung Han Lee

Jun Won Suh

Jong Seung Shin

Joong Ho Bae

Young Nam Park

Kyoung Jun Lee

Dong Hee Kim

Gyeong Jae Heo

Seung Hyun Choi

Gwang Seok Choe

Mi Hye Yun

Jung Bae Park

Jik Soo Kim

Jae Yong Jung

Du Yeol Kim

Ji Hyun Nam

Sung Jin Jang

Kwang Seok Choi

Ye Ri Jang

Jin Oh Son

A Reum Yang

Eun Byeol Hyeong

Yu Kyung Chun

Ju Kyoung Kang

Chang Woo Lee

Jong Hwan Park

Yoon Young Choi

Ra Na Lim

Sang Wook Lee

Yonghwan Gwon

Jin-Oh Son

Gwang Seok Choi

Yu Gyeong Chun

Eun Ok Oh

Yong Chul Sung

Suk Whan Lee

Hyung Joo Noh

Jong Ryeol Yu

Dong Gui Hoi

Jin Won Lee

Sun Kyu Kim

Jong-Seung Shin

Dong-Hee Kim

The present invention relates to a positive electrode active material having improved electrical characteristics by adjusting an aspect ratio gradient of primary particles included in a secondary particle, a positive electrode including the positive electrode active material, and a lithium secondary battery using the positive electrode.

Positive electrode active material and lithium secondary battery comprising the same

A positive electrode active material for a secondary battery comprises a lithium composite oxide represented by chemical formula 1 below and containing a layer-structured lithium excess oxide, wherein the lithium composite oxide comprises a secondary particle; the secondary particle comprises at least one primary particle; the primary particle comprises at least one crystallite; at least any one of the secondary particle, the primary particle, or the crystallite comprises a core and a shell occupying at least a portion of the surface of the core. When the crystal structure of space group C2/m is designated as [C2/m], the crystal structure of space group R-3m is designated as [R-3m], and the ratio of the crystal structure of space group C2/m versus the crystal structure of space group R-3m is designated as [C2/m]/[R-3m], the [C2/m]/[R-3m] of the core differs from that of the shell in the secondary particle: [chemical formula 1] rLiM1O·(1−r)LiM2O.

Positive electrode active material for lithium secondary battery, method for preparing same, and lithium secondary battery including same

The present invention relates to a positive electrode active material and a lithium secondary battery using a positive electrode containing the positive electrode active material. More particularly, the present invention relates to a positive electrode active material that is able to solve a problem of increased resistance according to an increase in Ni content by forming a charge transport channel in a lithium composite oxide and a lithium secondary battery using a positive electrode containing the positive electrode active material.

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 μm in an amount ranging from 50 to 100% by volume with respect to the total overlithiated layered oxide.

Positive electrode active material for lithium secondary battery, method for preparing the same, and lithium secondary battery including the same

The present invention relates to a positive electrode additive for a lithium secondary battery and a positive electrode material including the same, and more particularly, to a positive electrode additive for a lithium secondary battery, which enables stable maintenance of the electrochemical properties of a lithium secondary battery by reducing irreversible capacity loss of a negative electrode and reductions in gelation and gas generation, caused by a conventional positive electrode additive, and a positive electrode material including the same.

Positive electrode additive for lithium secondary battery and positive electrode material comprising the same

The present disclosure relates to a positive electrode active material including a first lithium composite oxide and a second lithium composite oxide that have a larger average particle diameter than the first lithium composite oxide. The first lithium composite oxide and the second lithium composite oxide are each independently represented by a formula of LiNiCoM1M2M3O, where M1 is at least one selected from Mn and Al, M2 and M3 are each independently selected from Al, Ba, B, Ce, Cr, Mg, Mn, Mo, Na, K, P. Sr, Ti, W, Nb and Zr, M1 to M3 are different, and 0.90≤a≤1.05, 0≤b≤0.10, 0≤c≤0.10, 0≤d≤0.025, 0≤e≤0.025, and 1.0≤f≤2.0. The second lithium composite oxide has an average particle diameter (D50) of 8.5 μm or more.

A lithium complex oxide includes a mixture of first particles of n1 (n1>40) aggregated primary particles and second particles of n2 (n2≤20) aggregated primary particles, the lithium complex oxide represented by Chemical Formula 1 and having FWHM (deg., 2θ) of 104 peak in XRD, defined by a hexagonal lattice having R-3m space group, in a range of Formula 1:LiNiCoMnMO,  [Chemical Formula 1]

Lithium complex oxide

The present invention relates to a lithium composite oxide including a coating layer having a boron-containing oxide and a lithium secondary battery including the same. More particularly, the present invention relates to a lithium composite oxide improved in lifetime and capacity characteristics by inducing a predetermined correlation between the molar ratio of nickel in a lithium composite oxide including a coating layer having a boron-containing oxide and a full width at half-maximum (FWHM; deg., 2θ) of a (104) peak among XRD peaks defined by the hexagonal lattice with an R-3m space group, and a lithium secondary battery including the same.

Lithium composite oxide and lithium secondary battery comprising the same

The present invention relates to a lithium composite oxide having improved stability and electrical characteristics as a positive electrode material by inhibiting an interfacial side reaction in the lithium composite oxide and improving the stability of a crystal structure and ion conductivity, and a lithium secondary battery including the same.

The present invention relates to a lithium composite oxide capable of improving capacity and lifetime characteristics of a lithium secondary battery and a lithium secondary battery including the same. According to the present invention, since the atomic ratio of boron (B) and nickel (Ni) in the surface region of the lithium composite oxide including primary particles enabling lithium intercalation and deintercalation and secondary particles formed by aggregating the primary particles is in a specific range, the stability of the lithium composite oxide may be improved, and thus it is possible to improve the capacity and lifetime characteristics of the lithium secondary battery using the lithium composite oxide as a positive electrode active material.

The present invention relates to a positive electrode active material which makes it possible to improve the electrochemical properties and stability of a positive electrode active material including a lithium composite oxide by adjusting the direction of a concentration gradient of a metal element of the lithium composite oxide, and a lithium secondary battery using a positive electrode including the positive electrode active material.

A lithium complex oxide and method of manufacturing the same, more particularly, a lithium complex oxide effective in improving the characteristics of capacity, resistance, and lifetime with reduced residual lithium and with different interplanar distances of crystalline structure between a primary particle locating in an internal part of secondary particle and a primary particle locating on the surface part of the secondary particle, and a method of preparing the same.

Lithium complex oxide for lithium secondary battery positive active material and method of preparing the same

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.

Positive electrode active material for lithium secondary battery and lithium secondary battery including the same

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Cheongju-si, South Korea

Moon Ho Choi