Lg Chem, Ltd

Jun Ho Eom

Sung Ho Ban

Na Ri Park

Hyeon Hui Baek

Chae Jin Lim

Ji Hye Kim

Woo Ram Lee

Dong Joon Ahn

Yeo June Yoon

Seo Hee Ju

Kwon Young Choi

Jae Geun Kim

Duck Gyun Mok

Ji Hun Jung

Ki Cheol Shin

Sang Jo Lee

Byoung Hun Jung

Dong Ryoung Kang

A positive electrode material, a positive electrode including the same, and a lithium secondary battery including the same are disclosed herein. In some embodiments, a positive electrode material includes a first positive electrode active material having a larger average particle diameter than a second positive electrode active material, wherein the first positive electrode active material and the second positive electrode active material are each independently a lithium transition metal oxide having a molar ratio of nickel of 80 mol % or more relative to the total molar amount of transition metals in the lithium transition metal oxide, and the positive electrode material satisfies Equation (1):0<{()/}×100≤10  Equation (1):wherein, in Equation (1), A denotes a particle strength of the first positive electrode active material, and B denotes a particle strength of the second positive electrode active material.

Positive electrode material for lithium secondary battery, and positive electrode and lithium secondary battery which include the same

A positive electrode material, a positive electrode including the same, a lithium battery including the same, and a method of preparing the same are disclosed herein. In some embodiments, a method of preparing a positive electrode active material including forming a first coating layer on a surface of a lithium transition metal oxide represented by Formula 1 using a basic aqueous solution containing a coating element M(where Mincludes at least one selected from sodium (Na) and aluminum (Al)), dry-mixing the lithium transition metal oxide having the first coating layer formed on a surface thereof, and a raw material containing a coating element M(where Mincludes boron (B)) and heat treating the mixture to form a second coating layer.

Method for preparing positive electrode active material for lithium secondary battery and positive electrode active material prepared thereby

Provided is a lithium secondary battery which includes a positive electrode, a negative electrode, a separator interposed between the positive electrode and the negative electrode, and an electrolyte, wherein the positive electrode includes a lithium composite transition metal oxide powder having a layered structure and a nickel content accounting for 85 atm % or more of total transition metals, and wherein the lithium composite transition metal oxide powder undergoes a 3% or less change in lithium-oxygen (Li—O) interlayer spacing in a state-of-charge (SOC) range of 58% to 72%.

Positive electrode active material for lithium secondary battery and lithium secondary battery

Provided is a lithium secondary battery including a positive electrode, a negative electrode, a separator interposed between the positive electrode and the negative electrode, and an electrolyte, wherein the positive electrode includes, as a positive electrode active material, a lithium composite transition metal oxide powder having a layered structure and a nickel content accounting for 50 atm % or more of total transition metals, and wherein the layered structure of the positive electrode active material is phase-transformed into a spinel structure at a temperature of 300° C. or more in a fully charged state.

Provided is a method of preparing a positive electrode active material, which includes preparing a mixture by mixing a lithium compound, a transition metal precursor, and a metal oxide additive, and sintering the mixture to form a lithium transition metal oxide, wherein the sintering is performed through two-stage temperature holding sections, a temperature of a first temperature holding section is in a range of 400&#xb0; C. to 650&#xb0; C., and a temperature of a second temperature holding section is in a range of 700&#xb0; C. to 900&#xb0; C. A positive electrode including a positive electrode active material prepared according to the method, and a lithium secondary battery including the positive electrode is also provided.

Method of preparing positive electrode active material for secondary battery and secondary battery using the same

A method for preparing a positive electrode active material and a positive electrode active material prepared by the method are provided. The method includes preparing a lithium composite transition metal oxide represented by Formula 1, and washing the lithium composite transition metal oxide with a cleaning liquid containing cleaning water and a surfactant. The cleaning liquid contains cleaning water in an amount of no less than 50 parts by weight and less than 400 parts by weight based on 100 parts by weight of the lithium composite transition metal oxide.

Positive electrode active material, preparation method thereof, positive electrode including same and secondary battery

A method of preparing a positive electrode active material for a secondary battery is provided, which includes preparing a lithium composite transition metal oxide, and mixing the lithium composite transition metal oxide and a metal borate compound and performing a heat treatment to form a coating portion on surfaces of particles of the lithium composite transition metal oxide. The positive electrode active material prepared includes lithium composite transition metal oxide particles, and a coating portion formed on surfaces of the lithium composite transition metal oxide particles, wherein the coating portion includes lithium (Li)-metal borate.

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

A method of preparing a positive electrode active material includes forming a tungsten-doped lithium transition metal oxide, and washing the lithium transition metal oxide, wherein, in the washing, a hydroxide-based compound is added to a washing liquid during the washing, a positive electrode including a positive electrode active material prepared according to the method, and a lithium secondary battery including the positive electrode.

The present disclosure provides a novel composite transition metal oxide-based precursor, a preparing method thereof, and a cathode active material for a secondary battery prepared from the precursor. In the present disclosure, it is possible to enhance productivity and economic efficiency due to a high reaction yield during the synthesis of a cathode active material and to enhance the initial discharge capacity and lifespan characteristics of a secondary battery including a cathode active material by using an oxide-based precursor having a high oxygen fraction instead of a hydroxide-based precursor used as a precursor of a cathode active material in the related art.

Growing community of inventors

Daejeon, South Korea

Jun Ho Eom