Cathode active material, method for preparing same, and lithium secondary battery comprising same

A cathode active material, lithium secondary battery technology, applied in secondary batteries, lithium storage batteries, active material electrodes, etc., can solve the problems of low thermal stability, difficult commercialization, structural collapse, etc., to reduce the initial resistance and Resistance increase rate, excellent high temperature life characteristics, high capacity effect

Pending Publication Date: 2022-08-02
POHANG IRON & STEEL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among the existing layered cathode active materials, the material with the highest capacity is LiNiO 2 (275mAh / g), but it is prone to structural collapse during charging and discharging, and the problem of oxidation number leads to low thermal stability, so it is actually difficult to commercialize

Method used

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  • Cathode active material, method for preparing same, and lithium secondary battery comprising same
  • Cathode active material, method for preparing same, and lithium secondary battery comprising same
  • Cathode active material, method for preparing same, and lithium secondary battery comprising same

Examples

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preparation example Construction

[0049] According to another embodiment, a method for preparing a positive electrode active material includes: placing an aqueous metal salt solution into a co-precipitation reactor to obtain a metal precursor; mixing the metal precursor, a lithium raw material, and a doping raw material , to prepare a mixture; a step of cooling the mixture after a heat treatment; and washing and drying the product of the cooling step, mixing it with a coating-forming substance, and then performing a second heat treatment. The coating-forming substance may contain boron compounds, LiOH and Li 2 SO 4 .

[0050] First, the following steps are carried out: the aqueous metal salt solution is put into a coprecipitation reactor to obtain a metal precursor.

[0051] More specifically, the metal raw materials such as nickel raw materials, cobalt raw materials, manganese raw materials, etc. that form lithium metal oxides are mixed with distilled water to prepare a metal salt aqueous solution, and then...

preparation example 1

[0091] Preparation Example 1 - Preparation of Cathode Active Material Precursor

[0092] prepared by a general co-precipitation method with (Ni 0.92 Co 0.04 Mn 0.04 )(OH) 2 component precursors.

[0093] Specifically, NiSO was used as the nickel raw material 4 ·6H 2 O, CoSO was used as cobalt raw material 4 ·7H 2 O, MnSO was used as manganese raw material 4 ·H 2 O. These raw materials were dissolved in distilled water to prepare an aqueous metal salt solution.

[0094] Next, after preparing the coprecipitation reactor, in order to prevent the oxidation of metal ions during the coprecipitation reaction, N 2 Purging was carried out and the reactor temperature was maintained at 50°C.

[0095] NH is added to the co-precipitation reactor 4 (OH) was used as a chelating agent and NaOH was used to adjust the pH.

[0096] The precipitate obtained according to the co-precipitation process was filtered, washed with distilled water, and dried in an oven at 100° C. for 24 hou...

Embodiment 1

[0108] Example 1 - Preparation with 500 ppm B, 1700 ppm LiOH, 3000 ppm Li 2 CO 3 , 10ppm Li 2 SO 4 Ni is 90% cathode active material

[0109] The cooled product was washed with distilled water, filtered and dried, followed by dry mixing of 500 ppm of H 3 BO 3 , 250ppm LiOH and 10ppm Li 2 SO 4 After the second heat treatment was performed, the same method as in Comparative Example 2 was used to prepare a surface containing 500 ppm of B, 1700 ppm of LiOH, and 3000 ppm of Li formed on the surface. 2 CO 3 , 10ppm Li 2 SO 4 The coated cathode active material.

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Abstract

The present embodiment relates to a positive electrode active material for a lithium secondary battery, a method for preparing the same, and a lithium secondary battery comprising the same. According to one embodiment, there may be provided a lithium secondary battery positive electrode active material comprising: lithium metal oxide particles; and a coating layer on at least a portion of a surface of the lithium metal oxide particles, the coating layer including B, LiOH, Li2CO3, and Li2SO4.

Description

technical field [0001] The present invention relates to a positive electrode active material, a method for preparing the same, and a lithium secondary battery including the same. Background technique [0002] In recent years, with the explosive growth in demand for IT mobile devices and small electric drive devices (electric bicycles, small EVs, etc.) and the increase in demand for electric vehicles with a range of more than 400 km, worldwide efforts to develop high-capacity vehicles have been actively developed. , The research and development of high energy density secondary battery. [0003] In order to prepare such a high-capacity battery, a high-capacity cathode active material needs to be used. Among the existing layered cathode active materials, the material with the highest capacity is LiNiO 2 (275mAh / g), but it is prone to structural collapse during charging and discharging, and the oxidation number problem leads to low thermal stability, so it is practically diffi...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/62H01M4/525H01M4/505H01M10/052C01G53/00C01B35/00C01D15/02C01D15/06C01D15/08
CPCH01M4/36Y02E60/10C01P2004/80C01P2002/52C01P2002/54C01P2004/03C01P2006/40C01G53/04C01P2004/61C01G53/42H01M10/052H01M4/131H01M4/1391H01M4/62H01M4/525H01M2004/028H01M10/0525H01M4/366H01M4/505
Inventor 权五珉崔权永李尚奕宋定勋朴锺一南相哲朴寅彻皇甫根
Owner POHANG IRON & STEEL CO LTD
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