Sk on Co., Ltd.

Sk Innovation Co., Ltd.

Mi Jung Noh

Jik Soo Kim

Sang Bok Kim

Kook Hyun Han

Ji Hoon Choi

Myoung Lae Kim

Hyo Shin Kwak

Duck Chul Hwang

Jin Seok Seo

Se Rah Moon

Tae Kyoung Lee

Dong Wook Ha

Sang Min Park

Dong Il Jang

Jae Ho Choi

A cathode active material for a lithium secondary battery according to embodiments of the present invention includes a lithium metal oxide particle which includes a core part and a shell part and contains nickel (Ni), cobalt (Co) and manganese (Mn). A total Ni content of the lithium metal oxide particle is 70 mol % or more based on a total 100 mol % of Ni, Co and Mn. The shell part includes a depth region in a range of 10 to 100 nm from a surface of the lithium metal oxide particle, and a Co content thereof in the depth region is 1.4 to 6 times a Co content of the core part. Stability of the lithium secondary battery may be improved through surface treatment using high content of Co.

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

A cathode active material for a lithium secondary battery according to embodiments of the present invention has a high-nickel composition and includes a lithium-nickel composite metal oxide particle in which lithium, nickel and a metal having an oxidation number of +2 are combined in a predetermined range. A cation disorder caused when a nickel ion is present at a lithium-ion site is reduced to improve structural stability of the cathode active material. An initial capacity and a battery efficiency of a lithium secondary battery can be improved using the cathode active material.

Cathode active material for lithium secondary battery and lithium secondary battery including the same

A cathode active material for a lithium secondary battery is provided. According to embodiments of the present invention, the cathode active material includes a lithium-transition metal composite oxide particle including a plurality of primary particles. The lithium-transition metal composite oxide particle has a lithium-boron-containing portion formed between the primary particles. Thereby, it is possible to improve life-span properties and capacity properties by removing residual lithium.

A cathode active material for a lithium secondary battery includes a lithium-aluminum-titanium oxide formed on a surface of a lithium metal oxide particle having a specific formula. The cathode active material may have an improved structural stability even in a high temperature condition.

A cathode active material for a lithium secondary battery includes a lithium metal oxide particle and a thio-based compound formed on at least portion of a surface of the lithium metal oxide particle. The thio-based compound has a double bond that contains a sulfur atom. Chemical stability of the lithium metal oxide particle may be improved and surface residues may be reduced by the thio-based compound.

Cathode active material for lithium secondary battery and method of manufacturing the same

In a method of manufacturing a cathode active material for a lithium secondary battery, a preliminary lithium metal oxide particle is prepared. The preliminary lithium metal oxide particle is cleaned using a boron compound cleaning solution. A cathode active material for a lithium secondary particle includes a lithium metal oxide particle where a ratio of a B+ peak intensity relative to a sum of peak intensities of Li+, B+ and LiB+ fragments by a TOF-SIMS analysis is in a range from 0.03% to 1.5%.

In a method of preparing a lithium metal oxide, a preliminary lithium metal oxide is prepared. The preliminary lithium metal oxide is washed using a washing solution to remove lithium salt impurities. The washing solution includes water and an organic ligand multimer compound. The lithium metal oxide having improved structural uniformity and stability is obtained using the washing solution.

Method of preparing lithium metal oxide and method of manufacturing lithium secondary battery

In a method of preparing a lithium metal oxide, a preliminary lithium metal oxide is prepared. The preliminary lithium metal oxide is washed using an organic washing solution to remove lithium salt impurities. The organic washing solution includes an organic solvent and a multivalent carboxylic acid compound. A minimum distance between oxygen atoms included in different carboxylic acid groups neighboring each other in the multivalent carboxylic acid compound is 220 pm or more.

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Daejeon, South Korea

Mi Jung Noh