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

A positive electrode active material, lithium secondary battery technology, applied in the direction of secondary batteries, battery electrodes, chemical instruments and methods, etc., can solve the problems of low stability, unproposed, and incapable of electrochemically expressing capacity, etc., to improve the initial efficiency effect

Inactive Publication Date: 2019-08-13
POHANG IRON & STEEL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Due to the generation of oxygen during this chemical change, the stability is evaluated as low, and the changed nickel oxide is a stable compound, so the capacity cannot be expressed electrochemically
In addition, this phenomenon is more serious at high temperatures higher than normal temperature, so there is a problem that the stability and life characteristics at high temperatures are further deteriorated
[0006] In this regard, various studies have been conducted to ensure high capacity of lithium secondary batteries while improving life characteristics, but a solution to fundamentally solve the above-mentioned problems has not yet been proposed

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

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preparation example Construction

[0061] Preparation method of positive electrode active material

[0062] Another exemplary embodiment of the present invention provides a method for preparing a cathode active material for a lithium secondary battery, which includes the step of heat-treating a mixture of nickel-based layered structure lithium metal oxide particles, a manganese source material, and a boron source material.

[0063] The preparation method is one of the methods for obtaining the aforesaid positive electrode active material, which only includes the process of heat-treating the mixture of nickel-based layered structure lithium metal oxide particles, manganese source material and boron source material.

[0064] The relevant description of the materials finally obtained by the method will be omitted below, but the specific process characteristics of the method will be described.

[0065] Specifically, the heat treatment may be performed at a temperature ranging from 150°C to 400°C.

[0066] More s...

Embodiment 1

[0080] Embodiment 1 (weight ratio is active material: manganese carbonate: boric acid=100: 0.12: 0.15, heat treatment under 250 ℃)

[0081] (1) Preparation of positive electrode active material

[0082] 1) Preparation of lithium metal oxide particles

[0083] Lithium metal oxide particles with a concentration gradient of nickel were prepared.

[0084] Specifically, NiSO was used as the nickel raw material 4 ·6H 2 O, using CoSO as the cobalt raw material 4 ·7H 2 O, using MnSO as the manganese raw material 4 ·H 2 O to prepare two metal salt solutions with different concentrations of Ni, Co and Mn.

[0085] For the first metal salt aqueous solution used to form the inner core, the raw materials described in distilled water are mixed to satisfy Ni 0.98 co 0.01 mn 0.01 )(OH) 2 The stoichiometric molar ratio, and the molar concentration of the overall metal salt prepared as 2.5M.

[0086] Independently of this, for the second metal salt solution used to form the shell,...

Embodiment 2

[0103] Embodiment 2 (weight ratio is active material: manganese carbonate: boric acid=100: 024: 0.15, heat treatment under 250 ℃)

[0104] Active material in embodiment 1: manganese carbonate: the weight ratio of boric acid=100: 0.12: 0.15 is changed into 100: 0.24: 0.15, except that, prepare positive electrode active material by the same method, and made 2032 coin batteries .

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Abstract

Provided are a method for preparing a cathode active material for a lithium secondary battery, in which Mn and B are simultaneously applied to the surface of a nickel-based lithium metal oxide, thereby enhancing structural stability and electrochemical characteristics, and a lithium secondary battery having a cathode comprising the cathode active material produced thereby.

Description

technical field [0001] The invention relates to a positive electrode active material, a preparation method thereof and a lithium secondary battery containing the same. Background technique [0002] A positive electrode active material, one of the components of a lithium secondary battery, generally has a structure capable of deintercalation / intercalation of lithium ions. If it is a positive electrode active material with a high manganese content, it shows high stability but low capacity. However, in order to realize a large-scale high-power battery, it is necessary to develop a cathode active material excellent in capacity and stability. [0003] On the other hand, the higher the nickel content of the cathode active material, the higher its capacity. However, it should be pointed out that the cathode active material with high nickel content has low stability compared with the cathode active material with high manganese content, and has poor lifetime characteristics due to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/525H01M4/505H01M4/131H01M10/0525C01G53/00
CPCH01M4/131H01M4/505H01M4/525H01M10/0525C01G53/42H01M4/366C01G53/006C01P2002/54Y02E60/10Y02P70/50C01G53/00H01M4/134
Inventor 李尚奕南相哲宋定勋
Owner POHANG IRON & STEEL CO LTD