Lg Chem, Ltd

Lg Energy Solution, Ltd.

University-Industry Cooperation Group of Kyung Hee University

Byung Chun Park

Wang Mo Jung

Sang Min Park

Seong Hoon Kang

Ji Hye Kim

Sang Wook Lee

Ju Kyung Shin

So Ra Baek

Tae Gu Yoo

Ho Suk Shin

Ji Hoon Ryu

Sang Seung Oh

Chul Haeng Lee

Sung Bin Park

Geungi Min

Minsuk Kang

Hong Kyu Park

Bo Ram Lee

Jeong Woo Oh

Sun Sik Shin

Hye Lim Jeon

Hyung Tae Kim

Sung Guk Park

Young Mi Seo

Je Young Kim

Seok Koo Kim

Dong Hun Lee

Chi Ho Jo

Sin Young Park

Sung-Kyun Chang

Jung Min Han

Ho Seon Shin

Yo Han Kwon

Jae Bin Chung

Yong Ju Lee

Dong-Myung Kim

Min Suk Kang

Seul Ki Kim

Jin Tae Hwang

Tae Gon Kim

Sungbin Park

Eun Sol Lho

Young Cheol Choi

Min Kwak

Woo Sik Kim

Joo Hong Jin

Eun Seok Choi

Soo Jung Kim

Seung Won Park

Shin Hyo Cho

In Seong Ju

Hyeong Ii Kim

Su Yeon Oh

Khuong Dien Thai

A lithium secondary battery includes a positive electrode, a negative electrode, a separator, and an electrolyte, wherein the positive electrode includes a positive electrode active material layer having a positive electrode active material containing an overlithiated manganese-based oxide represented by Formula 1 below, and the negative electrode includes a negative electrode active material layer having a silicon-based negative electrode active material,LiNiCoMnMO  [Formula 1]

Lithium secondary battery

A positive electrode active material, a method for producing the same, and a positive electrode and a lithium secondary battery in including the same are disclosed herein. In some embodiments, a method of producing a positive electrode active material includes mixing a lithium transition metal oxide and a carbon-based material having a hollow structure to form a mixture, and mechanically treating the mixture to form a carbon coating layer on the surface of the lithium transition metal oxide, wherein the carbon-based material has a chain shape, and has a specific surface area of 500 m/g or greater, a graphitization degree (I/I) of 1.0 or higher, and a dibutylphthalate (DBP) absorption of 300 mL/100 g or greater.

Method for producing positive electrode active material for lithium secondary battery and positive electrode active material for lithium secondary battery produced thereby

A positive electrode active material includes a nickel-based lithium composite metal oxide having a Ni content of 80 atm % or greater among transition metals except lithium, and in the form of a single particle or pseudo-single particle. The nickel-based lithium composite metal oxide has a coating layer positioned on the surface thereof, wherein the coating layer contains cobalt. The positive electrode active material also satisfies [Equation 1] 1≤XY/Z≤3, wherein X is the molar number (mol %) of Co in the coating layer based on 100 moles of the nickel-based lithium composite metal oxide, Y is the average particle diameter (μm) of nodules of the nickel-based lithium composite metal oxide, and Z is D(μm) of the positive electrode active material, wherein Z is from 5 μm to 12 μm.

Positive electrode active material and positive electrode including the same

The present invention provides a positive electrode active material for a secondary battery, which includes a lithium transition metal oxide including nickel (Ni) and cobalt (Co), and at least one selected from the group consisting of aluminum (Al), manganese (Mn), and a combination thereof. The lithium transition metal oxide is characterized in that the content of nickel (Ni) in the total transition metal elements is 80 mol % or more, and the cation mixing ratio of Ni cations in a lithium layer in the lithium transition metal oxide structure is 1.1% or less.

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

A positive electrode active material includes a core including a first lithium complex metal oxide, and a shell located surrounding the core and including a second lithium complex metal oxide, and further includes a buffer layer located between the core and the shell. The buffer layer includes a pore, and a three-dimensional network structure of a third lithium complex metal oxide which is connecting the core and the shell. Accordingly, the positive electrode active material is capable of enhancing an output property and a life property by minimizing destruction of the active material caused by a rolling process during the electrode preparation, maximizing reactivity with an electrolyte liquid, and by the particles that form the shell having a crystal structure with orientation facilitating lithium ion intercalation and deintercalation.

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

A non-aqueous electrolyte including an additive represented by Formula 1 is described: wherein in Formula 1, R may be any one selected from the group consisting of an alkyl group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, an alkynyl group having 2 to 10 carbon atoms, a cycloalkyl group having 3 to 12 carbon atoms, and a cycloalkenyl group having 3 to 12 carbon atoms, Rand Rmay each independently be any one selected from the group consisting of hydrogen (H), an alkyl group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, an alkynyl group having 2 to 10 carbon atoms, a cycloalkyl group having 3 to 12 carbon atoms, and a cycloalkenyl group having 3 to 12 carbon atoms, and A may be an alkylene group having 1 to 5 carbon atoms.

Non-aqueous electrolyte including additive for non-aqueous electrolyte and lithium secondary battery including the same

A lithium secondary battery including: a negative electrode; a positive electrode; a separator disposed between the negative electrode and the positive electrode; and an electrolyte, wherein the negative electrode includes SiOx (where 0<x<2) and a carbon-based negative electrode active material, the positive electrode includes a positive electrode active material including a lithium-rich manganese-based oxide in which a manganese content in the total metal except lithium is greater than 50 mol %, and a ratio (Li/Me) of the number of moles of lithium to a total number of moles of metals except lithium is greater than 1, and the depth of using SiOx defined by the disclosed Equation (1) in a state of SOC 0% is 1 to 15, preferably 3 to 15.

A non-aqueous electrolyte solution for a lithium secondary battery includes a compound represented by Formula 1 as follows, a lithium salt, and an organic solvent; and a lithium secondary battery including the same are described:

Non-aqueous electrolyte solution for lithium secondary battery and lithium secondary battery including the same

The present disclosure provides a non-aqueous electrolyte including an additive for a non-aqueous electrolyte represented by Formula 1 below: wherein, Rto Rmay each independently be any one selected from the group consisting of H, an alkenyl group having 2 to 20 carbon atoms, an alkynyl group having 2 to 20 carbon atoms, an alkoxy group having 1 to 20 carbon atoms, a cycloalkyl group having 3 to 12 carbon atoms, a cycloalkenyl group having 3 to 12 carbon atoms, and a nitrile group.

Non-aqueous electrolyte including additive for non-aqueous electrolyte, and lithium secondary battery including the non-aqueous electrolyte

The present invention relates to a positive electrode active material for a lithium secondary battery, a method for preparing the same and a lithium secondary battery including the same, the positive electrode active material includes a core including a first lithium complex metal oxide, and a shell located surrounding the core and including a second lithium complex metal oxide, and further includes a buffer layer located between the core and the shell, wherein the buffer layer includes a pore, and a three-dimensional network structure of a third lithium complex metal oxide which is connecting the core and the shell, and accordingly, minimizing destruction of the active material caused by a rolling process during the electrode preparation, and maximizing reactivity with an electrolyte liquid.

In one embodiment, a positive electrode active material for a secondary battery, the positive electrode active material being a primary particle having a monolithic structure that includes a lithium composite metal oxide of Formula 1 below, wherein the primary particle has an average particle size (D) of 2 &#x3bc;m to 20 &#x3bc;m and a Brunauer-Emmett-Teller (BET) specific surface area of 0.15 m/g to 0.5 m/g, and wherein the positive electrode active material has a rolling density of 3.0 g/cc or higher under a pressure of 2 ton&#xb7;f:LiNiCoM1M3M2O&#x2003;&#x2003;[Formula 1]

Positive electrode active material for secondary battery, and secondary battery comprising the same

A positive electrode active material includes a center portion including a first lithium transition metal oxide with an average composition represented by Formula 1,Li(NiCoMnAlM)O&#x2003;&#x2003;[Formula 1]

Positive electrode active material for lithium secondary battery, method of preparing the same, and positive electrode for lithium secondary battery and lithium secondary battery which include the positive electrode active material

The present invention relates to a positive electrode active material for a lithium secondary battery which includes a lithium composite transition metal oxide including nickel (Ni), cobalt (Co), and manganese (Mn), wherein a portion of nickel (Ni) sites of the lithium composite transition metal oxide is substituted with tungsten (W), and an amount of a lithium tungsten oxide remaining on surfaces of lithium composite transition metal oxide particles is 1,000 ppm or less.

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

The present invention provides a positive electrode active material for a secondary battery which includes a lithium transition metal oxide, wherein the positive electrode active material has three peaks in a differential graph (ERC curve) obtained by differentiating a pH value against an amount of acid (HCl) added, which is obtained by pH titration of 10 g of the lithium transition metal oxide using 0.5 M HCl, wherein a y-axis (dpH/dml) value of a first peak at the smallest x-axis value among the three peaks is &#x2212;1.0 or less.

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

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Daejeon, South Korea

Byung Chun Park