Ecopro Bm Co., Ltd.

Samsung Sdi Co., Inc.

Hyun Jong Yu

Moon Ho Choi

Suk Yong Jeon

Jong Seung Shin

Young Nam Park

Kyoung Jun Lee

Dong Hee Kim

Gyeong Jae Heo

Seung Hyun Choi

Jung Bae Park

Eun Byeol Hyeong

Yu Kyung Chun

Jong Hwan Park

Chang Woo Lee

Yoon Young Choi

Sang Wook Lee

Yu Gyeong Chun

Yonghwan Gwon

Eun Ok Oh

Jong-Seung Shin

Dong-Hee Kim

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.

Positive electrode active material 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.

Lithium composite oxide and lithium secondary battery comprising the same

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

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.

Positive electrode active material and lithium secondary battery including the same

The present invention relates to a positive electrode active material and a lithium secondary battery including the same, and more particularly, to a bimodal-type positive electrode active material including a first lithium composite oxide, which is a small particle, and a second lithium composite oxide, which is a large particle, these particles having different particle diameters, wherein the positive electrode active material makes it possible to prevent deterioration in electrochemical properties and stability thereof, which are generated due to non-uniform formation of a coating layer at least partially coating surfaces of the small and large particles, a positive electrode including the positive electrode active material, and a lithium secondary battery using the same.

The present invention relates to a positive electrode active material and a lithium secondary battery including the same, and more particularly, to a positive electrode active material which exhibits a predetermined peak intensity ratio and a predetermined voltage ratio in a graph illustrating the voltage (V) and the battery capacity (Q) at the 3cycle and having an X axis indicating the voltage (V) and a Y axis indicating a value (dQ/dV) obtained by differentiating the battery capacity (Q) with respect to the voltage (V) when charging/discharging is performed under predetermined conditions, and a lithium secondary battery including the same.

Disclosed is 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 a 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.

The present invention relates to a positive electrode active material which has the structural stability of a lithium composite oxide constituting a positive electrode active material and a lithium secondary battery including the same. The lithium composite oxide constituting the positive electrode active material according to the present invention is able to reduce the surface area and grain boundary of secondary particles having a side reaction with an electrolyte solution, thereby improving high-temperature stability and reducing gas generation caused by the positive electrode active material, and the structural stability of the lithium composite oxide may be improved using a cation-mixing layer covering the surface of a primary particle.

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.

Lithium composite oxide, positive electrode active material and lithium secondary battery comprising the same

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

Disclosed is 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.

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 Niis higher than the content of Niand a ratio of Ni/Niis 1.5 or greater so that life characteristics and capacity characteristics are improved, while residual lithium is reduced, and a preparation method thereof.

Growing community of inventors

Cheongju-si, South Korea

Hyun Jong Yu