Lg Chem, Ltd

Hyun Ah Park

Sang Soon Choi

Won Sig Jung

Seung Beom Cho

Jun Seok Nho

Jun Seong Ahn

A method of washing a positive electrode active material includes (1) preparing a lithium composite transition metal oxide which contains Ni, Co and Mn, and has the Ni content of 60 mol % or more; (2) putting the lithium composite transition metal oxide into water; and (3) adding a weak acid to water to which the lithium composite transition metal oxide is added to adjust the pH to 7 to 10, wherein the acid is a weak acid.

Method of washing positive electrode active material, and positive electrode active material prepared thereby

A positive electrode for a secondary battery includes a positive electrode active material layer, which includes a positive electrode active material including a lithium transition metal oxide which contains nickel, cobalt, and manganese and has an atomic ratio of nickel in total transition metals of 80 atm % or more, and a metal oxide including a metallic element having a binding potential with lithium of 0.5 V to 4 V. A secondary battery including the positive electrode is also provided.

Positive electrode having lithium transition metal oxide containing nickel, cobalt and manganese for secondary battery and secondary battery including the same

A method of preparing a positive electrode active material which includes forming a pre-sintered mixture by adding a reaction mixture including a lithium raw material and a nickel-manganese-cobalt precursor to a first crucible and performing a primary heat treatment at a temperature of 500&#xb0; C. to 800&#xb0; C., and, after discharging the pre-sintered mixture from the first crucible, adding the pre-sintered mixture to a second crucible and performing a secondary heat treatment at a temperature of 700&#xb0; C. to 1,000&#xb0; C. to form a lithium nickel manganese cobalt-based positive electrode active material, wherein a volume of the pre-sintered mixture formed after the primary heat treatment is 20% to 50% of a volume of the reaction mixture added to the first crucible.

Method for preparing positive electrode active material

The present disclosure relates to a positive electrode active material for a lithium secondary battery and a method of preparing the same, and more particularly, to a positive electrode active material for a lithium secondary battery comprising a lithium-nickel-based transition metal oxide; and a coating layer formed on the lithium-nickel-based transition metal oxide, the coating layer comprising a metal oxalate compound, and a method of preparing the same.

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

The present invention provides a method of preparing a positive electrode active material precursor for a lithium secondary battery, a method of preparing a positive electrode active material for a lithium secondary battery in which the positive electrode active material precursor prepared by using the above method is used, and a positive electrode for a lithium secondary battery and a lithium secondary battery which include the positive electrode active material.

Method for preparing positive electrode active material precursor for lithium secondary battery

A method of preparing a positive electrode active material precursor for a lithium secondary battery by using a batch-type reactor, which includes the steps of 1) forming positive electrode active material precursor particles while continuously adding a transition metal-containing solution including a transition metal cation, an aqueous alkaline solution, and an ammonium ion-containing solution to a batch-type reactor, 2) sedimenting the positive electrode active material precursor particles formed; 3) discharging a supernatant formed after the sedimentation of the positive electrode active material precursor particles to an outside; 4) adjusting a pH to 10 to 12 by adding the ammonium ion-containing solution; and 5) growing the positive electrode active material precursor particles while continuously again adding the transition metal-containing solution to the batch-type reactor, and a method of preparing a positive electrode active material using the same.

Methods of preparing positive electrode active material precursor for lithium secondary battery and positive electrode active material

The present invention relates to a positive electrode active material for a lithium secondary battery and a method of preparing the same, and more particularly, to a positive electrode active material for a lithium secondary battery comprising a lithium-nickel-based transition metal oxide; and a coating layer formed on the lithium-nickel-based transition metal oxide, the coating layer comprising a metal oxalate compound, and a method of preparing the same.

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Daejeon, South Korea

Hyun Ah Park