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Positive electrode active material for secondary battery, method for producing same, and lithium secondary battery comprising same

A cathode active material, secondary battery technology, used in secondary batteries, electrode manufacturing, battery electrodes, etc., can solve problems such as lattice structure instability, structural collapse, change the inherent properties of materials, and achieve excellent thermal stability , The effect of suppressing output reduction and suppressing resistance increase

Pending Publication Date: 2021-04-16
LG CHEM LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The deintercalated oxygen reacts with the electrolyte, thereby changing the intrinsic properties of the material, and there is a problem of causing instability of the lattice structure and further structural collapse

Method used

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  • Positive electrode active material for secondary battery, method for producing same, and lithium secondary battery comprising same
  • Positive electrode active material for secondary battery, method for producing same, and lithium secondary battery comprising same
  • Positive electrode active material for secondary battery, method for producing same, and lithium secondary battery comprising same

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preparation example Construction

[0022] The method for preparing the positive electrode active material of the present invention will be described step by step in detail below.

[0023] First, a lithium composite transition metal oxide containing nickel (Ni), cobalt (Co), and manganese (Mn) is prepared, wherein the content of nickel (Ni) is 60 mol% or more based on the total content of transition metals.

[0024] The lithium composite transition metal oxide is a high-nickel (Ni) NCM system with a nickel (Ni) content of more than 60 mol% based on the total content of transition metals. More preferably, the content of nickel (Ni) may be 65 mol% or more, still more preferably 80 mol% or more, based on the total content of transition metals. When the nickel (Ni) content of the lithium composite transition metal oxide satisfies 60 mol% or more based on the total content of transition metals, a high capacity can be secured.

[0025] More specifically, the lithium composite transition metal oxide may be represented...

Embodiment 1

[0077] Lithium carbonate (Li 2 CO 3 ), so that the molar ratio of Li / metal (Ni, Co, Mn) became 1.06, and the mixed powder was introduced into an alumina crucible for heat treatment. Thereafter, the mixed powder was subjected to heat treatment at 750° C. for 5 hours and then at 870° C. for 10 hours in an oxygen atmosphere to prepare a lithium composite transition metal oxide.

[0078] After that, the heat-treated lithium composite transition metal oxide powder was pulverized using a mortar, and then 0.025 parts by weight of MgF was added based on 100 parts by weight of the lithium composite transition metal oxide. 2 and 0.3 parts by weight of H 3 BO 3 . The mixture was heat-treated at 380° C. for 5 hours in an air atmosphere to prepare a positive electrode active material having a coated portion (F 150 ppm, B 500 ppm).

Embodiment 2

[0080] In addition to 0.025 parts by weight of MgF 2 and 0.18 parts by weight of H 3 BO 3 Except for mixing, a positive electrode active material having a coating portion (F 150 ppm, B 300 ppm) was prepared in the same manner as in Example 1.

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Abstract

The present invention provides a method for producing a positive electrode active material for a secondary battery, the method comprising: a step for preparing a lithium-complex transition metal oxide which contains nickel (Ni), cobalt (Co), and manganese (Mn), the content of nickel (Ni) being 60 mol% or more with respect to the total content of transition metals; and a step for dry mixing and heat treating the lithium-complex transition metal oxide, MgF2 as a fluorine (F) coating source, and a boron (B) coating source to form a coating part on the surfaces of the lithium-complex transition metal oxide particles. In addition, the positive electrode active material produced in this way includes: a lithium-complex transition metal oxide including nickel (Ni), cobalt (Co), and manganese (Mn); and a coating part formed on the surfaces of the lithium-complex transition metal oxide particles, wherein the lithium-complex transition metal oxide contains 60 mol% or more of nickel (Ni) with respect to the total content of transition metals, and the coating part includes fluorine (F) and boron (B).

Description

technical field [0001] Cross References to Related Applications [0002] This application claims the benefit of Korean Patent Application No. 10-2018-0115731 filed with the Korean Intellectual Property Office on September 28, 2018, the disclosure of which is incorporated herein by reference in its entirety. technical field [0003] The present invention relates to a positive electrode active material for a secondary battery, a preparation method thereof, and a lithium secondary battery containing the same. Background technique [0004] Recently, due to the rapid spread of electronic devices using batteries, such as mobile phones, notebook computers, electric vehicles, etc., the demand for small and light-weight secondary batteries with relatively high capacity has rapidly increased. In particular, lithium secondary batteries are lightweight and have high energy density, and thus are attracting attention as driving power sources for portable devices. Therefore, research ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/525H01M4/505H01M4/62H01M10/052C01G53/00C01F5/28C01B35/00
CPCC01B35/00H01M4/62H01M4/525Y02E60/10C01G53/44C01P2006/40C01P2004/80H01M4/366H01M10/0525H01M4/1391H01M4/0471H01M2004/028H01M4/505H01M10/052C01F5/28C01P2002/52
Inventor 金元泰柳淙烈河昇哲申先植
Owner LG CHEM LTD
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