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

A positive electrode active material and secondary battery technology, applied in secondary batteries, battery electrodes, active material electrodes, etc., can solve thermal stability degradation, active material structural stability and chemical stability degradation, battery life and stability Deterioration and other issues, to achieve the effect of reducing residues, improving structural/chemical stability degradation, reducing production time and process costs

Pending Publication Date: 2020-08-14
LG CHEM LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the case of a high-concentration nickel positive electrode active material with a high nickel content, there are problems that the structural stability and chemical stability of the active material deteriorate, and thermal stability rapidly deteriorates
In addition, with the increase of nickel content in the active material, LiOH and Li 2 CO 3 The residual amount of lithium by-products in the form of the increased, thus, causing gas generation and swelling phenomenon, resulting in the problem of deterioration of battery life and stability

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0113] 300g lithium composite transition metal oxide LiNi 0.86 co 0.1 mn 0.02 Al 0.02 o 2 Added to 300 mL of ultrapure water, and stirred for 30 minutes to wash with water, followed by filtration for 20 minutes. The filtered lithium composite transition metal oxide was dried in a vacuum oven at 130° C., and then sieved. After that, 0.0078 parts by weight (Co: 5000 ppm) of Co(OH) was added to 100 parts by weight of lithium composite transition metal oxide 2 and 0.0004 parts by weight (B: 300ppm) of B 4 C was mixed, and a high-temperature heat treatment was performed at 700° C. for 5 hours while supplying oxygen at a flow rate of 1 L / min to prepare a positive electrode active material.

Embodiment 2

[0115] Prepare the positive electrode active material in the same manner as in Example 1, except that 0.0031 parts by weight (Co: 2000ppm) of Co(OH) 2 and 0.0004 parts by weight (B: 300ppm) of B 4 C mixed.

experiment example 1

[0122] [Experimental example 1: Evaluation of heat flow]

[0123] The temperature-dependent heat flow of the cathode active material in Examples 1 and 2 and Comparative Examples 1 to 3 was measured by using a differential scanning calorimeter (Sensys evo DSC of Setaram Instruments). Specifically, 16 mg of the positive electrode active material in Examples 1 and 2 and Comparative Examples 1 to 3 was added to a pressure-resistant pen for DSC measurement, and then 20 μL of electrolyte (EVPS) was injected. The temperature range for DSC analysis is 25°C-400°C, and the temperature increase rate is 10°C / min. DSC measurement was performed 3 or more times for each positive electrode active material, and the average value was measured. Measurement results are shown in Table 1 and figure 1 middle.

[0124] [Table 1]

[0125] Main peak(℃) Heat flow(W / g) Example 1 234.7 1,661 Example 2 234.9 1,981 Comparative example 1 230.1 2,228 Comparative ...

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Abstract

The present invention relates to a method for preparing a positive electrode active material for a secondary battery, the method comprising the steps of: preparing a lithium composite transition metaloxide containing nickel (Ni), cobalt (Co), and at least one selected from the group consisting of manganese (Mn) and aluminum (Al); washing the lithium composite transition metal oxide to remove a lithium byproduct present on the surface of the lithium composite transition metal oxide; and mixing the washed lithium composite transition meal oxide, a cobalt (Co)-containing raw material, and a boron (B)-containing raw material, followed by high-temperature thermal treatment at a temperature of 600 dDEG C or higher, and to the positive electrode active material thus prepared.

Description

technical field [0001] Cross References to Related Applications [0002] This application claims the benefit of Korean Patent Application No. 10-2018-0024858 filed with the Korean Intellectual Property Office on February 28, 2018, the disclosure of which is incorporated herein by reference in its entirety. technical field [0003] The 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] In recent years, with the rapid spread of electronic devices using batteries, such as mobile phones, notebook computers, and electric vehicles, the demand for secondary batteries that are small in size, light in weight and relatively high in capacity has rapidly increased. In particular, lithium secondary batteries are light in weight and have high energy density, so that they have attracted attention as a driving power source for portable devices. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G53/00C01B35/12H01M4/36H01M4/525H01M4/505H01M4/485H01M4/62H01M10/052
CPCC01B35/12H01M4/36H01M4/505H01M4/485H01M4/525H01M4/62H01M10/052Y02E60/10C01G53/42C01G53/50C01P2002/52C01P2006/40C01P2002/54C01P2002/88C01P2006/80C01B35/121H01M4/366C01P2004/80C01B32/991H01M10/0525H01M2004/028
Inventor 蔡和锡朴商敃朴信英朴洪圭姜成勋
Owner LG CHEM LTD