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Positive electrode active material, method for manufacturing positive electrode active material, and positive electrode and lithium secondary battery comprising positive electrode active material

A technology of positive active materials and raw materials, applied in secondary batteries, lithium storage batteries, active material electrodes, etc., can solve the problems of differential thermal properties, limitations, unstable crystal structure, etc., and achieve the effect of reducing surface resistance and lowering the unit price of manufacturing

Pending Publication Date: 2021-11-26
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, because LiCoO 2 Poor thermal properties due to unstable crystal structure caused by delithiation and use of expensive cobalt 2 Limited use as a power source for applications such as electric vehicles

Method used

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  • Positive electrode active material, method for manufacturing positive electrode active material, and positive electrode and lithium secondary battery comprising positive electrode active material
  • Positive electrode active material, method for manufacturing positive electrode active material, and positive electrode and lithium secondary battery comprising positive electrode active material

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preparation example Construction

[0052] The method for preparing positive electrode active material according to one embodiment of the present invention comprises the following steps: preparing a nickel-containing and cobalt-free transition metal hydroxide, the nickel content of which is more than 60 mol% of the total moles of transition metals; mixing metal hydroxide with lithium raw material and sintering the mixture, wherein the method may further include: mixing cobalt (Co) raw material during the process of mixing the transition metal hydroxide with lithium raw material and sintering the mixture, Alternatively, cobalt (Co) raw materials are mixed after sintering. In this case, the Co raw material is mixed in such an amount that the Co amount in the finally prepared cathode active material is in the range of more than 0 ppm to 6,000 ppm or less.

[0053] Hereinafter, each step of preparing the cathode active material will be described more specifically.

[0054] Firstly, a nickel-containing and cobalt-fr...

Embodiment 1

[0119] NiSO 4 , MnSO 4 and Al 2 (SO 4 ) 3 Dissolve in deionized water with the molar ratio of nickel:manganese:aluminum being 86:12:2 to prepare a 2M transition metal aqueous solution.

[0120] The vessel containing the transition metal aqueous solution was connected to a 5 L batch reactor set at 40°C. Separately, 2.2M ammonium aqueous solution and 40% sodium hydroxide aqueous solution were separately prepared and connected to the reactor. Put 4L of deionized water in the reactor, and then the reactor is purged with nitrogen at a rate of 0.2 L / min to remove dissolved oxygen in the water and form a non-oxidizing atmosphere in the reactor.

[0121] After that, the transition metal aqueous solution, the sodium hydroxide aqueous solution and the ammonium aqueous solution were added to the reactor at a rate of 0.3 mL / min, 0.2 mL / min and 0.2 mL / min, respectively, and a co-precipitation reaction was carried out for 10 hours to precipitate the transition metal Hydroxide particle...

Embodiment 2

[0124] Prepare the positive electrode active material precursor in the same manner as in Example 1, except that the Co 3 o 4 The transition metal aqueous solution of Example 1 was added in such an amount that the amount of Co in the finally prepared positive electrode active material was 2,000 ppm. Mix the positive electrode active material precursor and LiOH prepared above so that the transition metal: Li molar ratio is 1:1.03, and sinter at 800° C. for 10 hours in an oxygen atmosphere to prepare the positive electrode active material.

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Abstract

The present invention relates to a positive electrode active material, a manufacturing method therefor, and a positive electrode for a lithium secondary battery and a lithium secondary battery comprising the positive electrode active material, the positive electrode active material comprising: a nickel-based lithium transition metal oxide containing 60 mol% or more of nickel with respect to the total number of moles of metals excluding lithium, wherein the surface of the nickel-based lithium transition metal oxide contains cobalt in an amount of greater than 0 ppm to 6,000 ppm.

Description

[0001] Cross References to Related Applications [0002] This application claims priority from Korean Patent Application No. 10-2019-0001843 filed on January 7, 2019, the disclosure of which is incorporated herein by reference. technical field [0003] The invention relates to a positive electrode active material for a lithium secondary battery, a preparation method thereof, a positive electrode containing the positive electrode active material, and a lithium secondary battery. Background technique [0004] With the development of technology and the increase in demand for mobile devices, the demand for secondary batteries as energy sources has significantly increased. Among these secondary batteries, lithium secondary batteries having high energy density, high voltage, long cycle life, and low self-discharge rate have been commercialized and widely used. [0005] In a lithium secondary battery in a state where an organic electrolyte solution or a polymer electrolyte solutio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/525H01M4/131H01M10/052C01G53/00
CPCH01M4/525H01M4/131Y02E60/10C01G53/50C01P2006/80C01P2006/40C01P2002/85H01M2004/028H01M10/052C01G53/44H01M4/0471H01M4/505H01M10/0525
Inventor 李东勋朴星彬曹炯万韩政珉黄进泰郑王谟
Owner LG ENERGY SOLUTION LTD
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