Samsung Sdi Co., Inc.

Samsung Electronics Co., Ltd.

Dongwook Shin

Jinhwan Park

Sukgi Hong

Byungjin Choi

Jaegu Yoon

Jinsu Ha

Kitae Kim

Changsoo Lee

Junho Park

Byongyong Yu

Jayhyok Song

Kwangjin Park

Jiyoon Kim

Dongjin Ham

Donghee Yeon

Dongwook Han

Youhwan Son

Yongnam Ham

Sungnim Jo

San Moon

Hyung Cheoul Shim

Hayeon Lee

Haein Cho

This application relates to a cathode active material for a lithium secondary battery, a method of preparing the cathode active material, a cathode employing the cathode active material, and a lithium secondary battery employing the cathode. The cathode active material may include a secondary particle in which primary particles are aggregated and a first coating layer disposed on the plurality of primary particles to have a thickness of about 2.5 nm or less and including a NiO-like crystalline phase belonging to a Fm3-m space group. The cathode active material may prevent surface deterioration through a washing process using a weakly acidic or neutral organic buffer, thereby improving the initial efficiency characteristic and life characteristics of the lithium secondary battery while maintaining the initial capacity of the lithium secondary battery.

Cathode active material for lithium secondary battery, preparation method thereof, cathode including cathode active material, and lithium secondary battery including cathode

A composite cathode active material, a cathode and a lithium battery each including the composite cathode active material, and a method of manufacturing the composite cathode active material. The composite cathode active material includes a core including a plurality of primary particles, and a shell disposed on the core, wherein a primary particle of the plurality of primary particles includes a lithium nickel transition metal oxide, the shell includes a first composition and a second composition, wherein the first composition contains a first metal and the second composition contains a second metal, wherein the first metal includes a metal of Groups 2, 4, 5, and 7 to 15, the second metal includes a metal of Group 3, and the first composition includes a first phase and the second composition includes a second phase that is distinguishable from the first phase.

Composite cathode active material, cathode and lithium battery each containing composite cathode active material, and method of preparing composite cathode active material

A composite cathode active material includes a secondary particle; and a coating on a surface of the secondary particle, wherein the secondary particle comprises a plurality of primary particles, and the plurality of primary particles include a lithium nickel transition metal oxide having a layered crystal structure; and a grain boundary between primary particles of the plurality of primary particles, the grain boundary including a lithium metal oxide having a crystal structure different from the lithium nickel transition metal oxide having a layered crystal structure, wherein the coating on the surface of the secondary particle includes a metal oxide including cobalt, and a Group 2 element, a Group 12 element, a Group 13 element, or a combination thereof.

Composite cathode active material, cathode and lithium battery each including the same, and method of preparing composite cathode active material

A positive active material, including: a lithium transition metal composite oxide represented by Formula 1:LiNiM1M2M3O&#x2003;&#x2003;Formula 1

Positive active material, positive electrode and lithium secondary battery containing the material, and method of preparing the material

A cathode active material including a layered lithium transition metal oxide, wherein the layered lithium transition metal oxide includes a metal cation having an oxidation number of +4, and wherein the metal cation is disposed in an octahedral site of a lattice of the layered lithium transition metal oxide.

Cathode active material, cathode and lithium secondary battery including the same, and method of preparing cathode active material

A cathode active material includes a core capable of intercalating and deintercalating lithium ions; and a coating layer on at least a portion of the core, wherein the coating layer includes a composite including a metal oxide compound and a phosphate compound, the metal oxide compound is at least one compound selected from a lithium metal oxide and a metal oxide, the phosphate compound is at least one compound selected from a lithium phosphate, a lithium metal phosphate, and a metal phosphate, and a weight ratio of the metal oxide compound to the phosphate compound is from greater than 0 to about 1.

Cathode active material, cathode and lithium battery including the same, and method of preparing the cathode active material

The present invention relates to a cathode active material for a lithium secondary battery, a method for preparing the same, and a lithium secondary battery including the same, and provides a cathode active material including: a lithium manganese-excess layered structure composite oxide represented by Formula Li[Li(NiCoMn)]OF(here, a+b+c=1, 0.05&#x2266;x&#x2266;0.33, 0&#x2266;y&#x2266;0.08, and 0&#x3c;z&#x2266;0.05); a metal fluoride coating layer coated on a surface of the composite oxide; and a metal phosphate coating layer coated on the metal fluoride coating layer.

Cathode active material, method for preparing the same, and lithium secondary batteries including the same

Growing community of inventors

Suwon-si, South Korea

Dongwook Shin