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Method for preparing positive electrode active material precursor for lithium secondary battery, positive electrode active material precursor, and positive electrode active material, positive electrode, and lithium secondary battery prepared by using same

A technology for cathode active materials and precursors, applied in the field of preparing cathode active material precursors for lithium secondary batteries, cathode active material precursors, and cathode active materials prepared by using the precursors, cathodes, and lithium secondary batteries , can solve problems such as poor thermal stability, battery rupture, fire, etc., and achieve the effect of improving electrochemical performance

Pending Publication Date: 2022-07-08
LG CHEM LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, LiNiO 2 The limitation is that, with LiCoO 2 Compared to LiNiO 2 Has worse thermal stability, and when an internal short circuit occurs in a charged state due to external pressure, the positive electrode active material itself decomposes, causing rupture and fire of the battery

Method used

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  • Method for preparing positive electrode active material precursor for lithium secondary battery, positive electrode active material precursor, and positive electrode active material, positive electrode, and lithium secondary battery prepared by using same
  • Method for preparing positive electrode active material precursor for lithium secondary battery, positive electrode active material precursor, and positive electrode active material, positive electrode, and lithium secondary battery prepared by using same
  • Method for preparing positive electrode active material precursor for lithium secondary battery, positive electrode active material precursor, and positive electrode active material, positive electrode, and lithium secondary battery prepared by using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0137] NiSO was added in an amount such that the molar ratio of nickel:cobalt:manganese was 88:5:7 4 , CoSO 4 and MnSO 4 Mix in water to prepare an aqueous transition metal solution (first step).

[0138] The vessel containing the aqueous transition metal solution, additional NaOH solution, and NH 4 The aqueous OH solutions were each connected to a 350 L continuous filter tank reactor (CFTR) equipped with a filtration device (filter).

[0139] Subsequently, after 86 L of deionized water was put into the reactor, dissolved oxygen in the water was removed by purging the reactor with nitrogen at a rate of 20 L / min to create a non-oxidizing atmosphere in the reactor. After that, after adding NaOH aqueous solution and NH 4 After the OH aqueous solution, while stirring the mixture at a stirring speed of 700 rpm, a reaction mother liquor having a pH of 11.7 to 11.9 was prepared (second step).

[0140] After that, the transition metal aqueous solution, NH 4 Aqueous OH and NaOH wer...

Embodiment 2

[0146] In the same manner as in Example 1, except that the precursor core formation step (third step) and the particle growth reaction step (fourth step) were carried out for a total of 53 hours and the stabilization reaction (fifth step) was carried out for 15 hours A cathode active material precursor was prepared.

experiment example 1

[0157] Experimental Example 1: Particle Characterization

[0158] (1) Grain size of precursor

[0159] The grain sizes of the positive electrode active material precursor particles prepared in Examples 1 and 2 and Comparative Examples 1 to 2 were measured by the following method.

[0160] The X-ray diffraction (XRD) patterns of the precursors prepared in Examples 1 and 2 and Comparative Examples 1 and 2 were measured using an X-ray diffraction analyzer (Rigaku Corporation). The XRD patterns of the positive electrode active material precursor particles prepared in Examples 1 and 2 and Comparative Examples 1 and 2 are shown in figure 2 middle.

[0161] After obtaining the half-value widths of the peaks of the respective crystal planes from the measured XRD patterns, the grain sizes in the respective crystal planes of the precursor were calculated by ellipsoid modeling using the Scherrer formula.

[0162] The measurement results are shown in Table 1 below.

[0163] [Table 1]...

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Abstract

The present invention relates to a method for preparing a positive electrode active material precursor in which particle growth of the (001) plane is suppressed; a positive electrode active material precursor prepared by the above method; a positive electrode active material prepared by using the positive electrode active material; a positive electrode containing the positive electrode active material; and a lithium secondary battery.

Description

technical field [0001] This application claims priority from Korean Patent Application No. 10-2020-0034381 filed on March 20, 2020, the contents of which are incorporated herein by reference. [0002] The present invention relates to a method for preparing a positive electrode active material precursor for a lithium secondary battery, a positive electrode active material precursor prepared by the above method, and a positive electrode active material, a positive electrode and a lithium secondary electrode prepared by using the positive electrode active material precursor Battery. Background technique [0003] With the technological development and increase in demand for mobile devices, the demand for secondary batteries as an energy source has increased significantly. 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. [0004] Lithium t...

Claims

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Application Information

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IPC IPC(8): C01G53/04
CPCH01M10/052H01M4/505H01M4/525Y02E60/10C01P2006/40C01P2006/12C01P2006/11C01P2004/51C01P2004/61C01P2004/45C01P2002/72C01P2002/60C01G53/50C01G53/006H01M10/0525H01M4/131H01M2004/028C01G53/04C01P2004/64C01G53/44C01P2002/50
Inventor 金铉旭李应周金佑玹崔相洵金俊吉柳景日
Owner LG CHEM LTD
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