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

A technology for positive electrode active materials and lithium secondary batteries, which is applied in the direction of secondary batteries, battery electrodes, active material electrodes, etc., can solve problems such as difficult to uniformly coat/dope the surface or lattice of positive electrode active materials, and achieve Effect of suppressing resistance increase rate and increasing capacity retention rate

Pending Publication Date: 2021-02-26
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, coating / doping may incur additional costs, and it may be difficult to uniformly coat / dope the surface or lattice of positive electrode active materials

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0083] will Ni 0.69 co 0.13 mn 0.18 (OH) 2 The positive active material precursor and the lithium raw material (LiOH) were added to a Henschel mixer (700 L) so that the final molar ratio of Li / M(Ni,Co,Mn) was 1.05, and then mixed at a center speed of 300 rpm for 20 minutes . Put the mixed powder into an alumina crucible with a size of 330 mm × 330 mm, in oxygen (O 2 ) atmosphere at 500° C. for 10 hours, and then sintered at 730° C. for 30 hours to prepare a positive electrode active material.

Embodiment 2

[0085] A positive electrode active material was prepared in the same manner as in Example 1, except that the mixed powder was kept at 500° C. for 10 hours and then sintered at 750° C. for 20 hours.

experiment example 1

[0090] [Experimental Example 1: Measurement of crystallite size and strain]

[0091] The crystallite sizes of the cathode active materials prepared in Examples 1 and 2 and Comparative Examples 1 and 2 were measured. crystallite size FWHM is the crystallite size calculated from XRD data using the full width at half maximum (FWHM) method, the crystallite size IB is the crystallite size calculated from XRD data using the integrated width (IB) method.

[0092] [Table 1]

[0093] crystallite size FWHM (nm)

[0094] Referring to Table 1, for Examples 1 and 2, crystallite size FWHM Meet 80nm to 150nm, Δ size (|crystallite size IB – crystallite size FWHM ) (that is, strain) satisfies 20 or less, while Comparative Examples 1 and 2 do not satisfy Relational Expression 1 and / or Relational Expression 2, and a deviation occurs.

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Abstract

The present invention provides a positive electrode active material for a secondary battery, comprising a nickel (Ni)-based lithium composite transition metal oxide, wherein the lithium composite transition metal oxide satisfies formula 1 and formula 2. [Formula 1] 80 nm <= crystallite size FWHM <= 150 nm [Formula 2] deltasize(|crystallite sizeIB-crystallite sizeFWHM|) <= 20 In formula 1 and formula 2, the crystallite size FWHM is a crystallite size obtained by full width at half maximum (FWHM) calculation from XRD data, and the crystallite size IB is a crystallite size obtained by integral breadth (IB) calculation from XRD data.

Description

technical field [0001] Cross References to Related Applications [0002] This application claims priority from Korean Patent Application No. 10-2019-0013809 filed on February 1, 2019, the disclosure of which is incorporated herein by reference. [0003] The present invention relates to a positive electrode active material for a secondary battery and a lithium secondary battery comprising the positive electrode active material. Background technique [0004] In recent years, with the rapid spread of electronic devices using batteries, such as mobile phones, notebook computers, electric vehicles, etc., the demand for lightweight secondary batteries having relatively high capacity and small volume has rapidly increased. In particular, a lithium secondary battery as a driving power source of a portable device has attracted attention because the lithium secondary battery is light in weight and has a high energy density. Therefore, research and development work to improve the per...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/525H01M10/052C01G53/00
CPCH01M10/052H01M4/525Y02E60/10C01G53/50C01P2002/60C01P2006/40C01P2002/52C01P2002/70C01G53/44C01P2002/72C01P2004/51H01M4/505H01M10/0525H01M2004/021H01M2004/028
Inventor 白韶螺卢恩帅郑王谟李尚昱赵恩
Owner LG ENERGY SOLUTION LTD
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