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Preparation method of positive electrode active material for secondary battery

A positive active material, secondary battery technology, applied in battery electrodes, positive electrodes, lithium batteries, etc., can solve the problems of reduced charging/discharging efficiency, increased resistance, and performance degradation, to improve side reactions and improve thermal stability. , the effect of easy overburning

Pending Publication Date: 2022-04-01
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the degree of overburning cannot be properly adjusted because it is difficult to control the overburning that proceeds while raising the firing temperature, there are problems of performance degradation such as a decrease in charge / discharge efficiency and an increase in resistance

Method used

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  • Preparation method of positive electrode active material for secondary battery
  • Preparation method of positive electrode active material for secondary battery
  • Preparation method of positive electrode active material for secondary battery

Examples

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preparation example Construction

[0024]

[0025] The invention provides a method for preparing a positive electrode active material, which includes: providing a positive electrode active material precursor containing nickel, cobalt and manganese and having a nickel content of more than 60 mol% of all metals; Body, lithium source material, first sintering additive, second sintering additive and third sintering additive are mixed and fired once to form a lithium transition metal oxide, wherein the first sintering additive is a lithium-containing compound, and the second The firing additive is a carbonate ion-containing compound, and the third firing additive is a boron-containing compound.

[0026] Compared with low-concentration Ni NCM-based lithium composite transition metal oxides with relatively low Ni content, it is more difficult to prepare nickel (Ni) NCM-based lithium composite transition metal oxides with high Ni content in the form of single particles. This is because grain growth of high-concentrat...

Embodiment 1

[0093] LiOH as a lithium source was added to Ni as a cathode active material precursor 0.8 co 0.1 mn 0.1 (OH) 2 , the Li / metal (Ni, Co, and Mn) molar ratio was set to 1.05, and 2 parts by weight of LiOH were added thereto as the first firing additive, 1 part by weight of MgCO 3 As the second firing additive and 2 parts by weight of B 2 o 3 As the third firing additive, the total content of the firing additive was 5 parts by weight with respect to 100 parts by weight of the positive electrode active material precursor, and then mixed. For heat treatment, the mixed powders were placed in alumina crucibles. Thereafter, firing was performed at 800° C. for 20 hours under an oxygen atmosphere to prepare a lithium transition metal oxide. Subsequently, the lithium transition metal oxide was pulverized, washed, and dried to obtain a powder, and the obtained powder was heat-treated at 700° C. in an air atmosphere to obtain a positive electrode active material in a single particle ...

Embodiment 2

[0095] The positive active material was prepared in the same manner as in Example 1, except that 2 parts by weight of LiF were added as the first firing additive, 1 part by weight of CaCO 3 As the second firing additive and 2 parts by weight of H 3 BO 3 As the third firing additive, the total content of the firing additive was 5 parts by weight relative to 100 parts by weight of the positive electrode active material precursor.

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Abstract

The present invention provides a method for preparing a positive electrode active material for a secondary battery, comprising: providing a positive electrode active material precursor containing nickel, cobalt, and manganese, wherein the nickel content accounts for 60 mol% or more of the total metal; and forming a lithium transition metal oxide by mixing the positive electrode active material precursor, a lithium source material, a first firing additive, a second firing additive, and a third firing additive and performing primary firing, in which the first firing additive is a lithium-containing compound, the second firing additive is a carbonate ion-containing compound, and the third firing additive is a carbonate ion-containing compound. And the third firing additive is a boron-containing compound.

Description

technical field [0001] Cross References to Related Applications [0002] This application claims priority and benefit from Korean Patent Application No. 10-2019-0096996 filed on August 8, 2019, the disclosure of which is incorporated herein by reference in its entirety. technical field [0003] The invention relates to a preparation method of a positive electrode active material for a secondary battery. Background technique [0004] Recently, with the rapid spread of electronic devices using batteries such as mobile phones, notebook computers, and electric vehicles, the demand for small, lightweight, and relatively high-capacity secondary batteries has rapidly increased. In particular, lithium secondary batteries are attracting attention as driving power sources for portable devices because of their light weight and high energy density. Therefore, research and development work has been continuously conducted to improve the performance of lithium secondary batteries. [...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M10/052C01G53/00
CPCH01M4/505H01M4/525Y02E60/10C01P2004/03C01P2004/61C01G53/50C01P2002/52H01M10/052H01M4/36H01M4/364H01M10/0525H01M4/1391H01M4/485H01M4/62H01M2004/028H01M4/131C01G53/44C01P2006/40
Inventor 卢恩帅朴商敃郑王谟朴星彬金瑟己王文秀
Owner LG ENERGY SOLUTION LTD