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Positive electrode active material, preparation method thereof, and lithium secondary battery comprising the same

A positive electrode active material, lithium secondary battery technology, applied in the direction of active material electrodes, secondary batteries, positive electrodes, etc., can solve the problems of small capacity of nickel-based lithium metal oxides, low output characteristics of nickel-based lithium metal oxides, etc. , to achieve the effects of improved output characteristics and life characteristics, minimized increase rate, and high capacity

Active Publication Date: 2022-05-10
浦项控股股份有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Specifically, the output characteristics of nickel-based lithium metal oxides obtained at higher firing temperatures are low, and the capacity of nickel-based lithium metal oxides obtained at lower firing temperatures is small

Method used

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  • Positive electrode active material, preparation method thereof, and lithium secondary battery comprising the same
  • Positive electrode active material, preparation method thereof, and lithium secondary battery comprising the same
  • Positive electrode active material, preparation method thereof, and lithium secondary battery comprising the same

Examples

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preparation example Construction

[0107] Preparation method of positive electrode active material

[0108] Another implementation example of the present invention provides a method for preparing positive electrode active materials for lithium secondary batteries, the method comprising: the steps of preparing a first aqueous metal salt solution and a second aqueous metal salt solution respectively, the first aqueous solution of metal salt and the second aqueous solution of metal salt The second metal salt aqueous solution includes nickel raw material, heterogeneous metal raw material and water and the molar concentrations of the nickel raw material are different from each other; the first co-precipitation step, at a constant speed to the reaction that maintains a constant pH and is supplied with a chelating agent supply the first metal salt solution in the container; and a second co-precipitation step, after the first co-precipitation step, while gradually reducing the supply rate of the first metal salt solut...

preparation example 1

[0176] Preparation example 1 (large particle size cathode active material precursor)

[0177] 1) Preparation of metal salt solution

[0178] First, NiSO is used as a nickel-based 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, thereby preparing two kinds of metal salt aqueous solutions with different concentrations of Ni, Co and Mn.

[0179] When preparing the first metal salt solution for forming the core, in distilled water to satisfy (Ni 0.98 co 0.01 mn 0.01 )(OH) 2 The various raw materials were mixed in a stoichiometric molar ratio such that the molar concentration of the metal salt as a whole was 2.5M.

[0180] Independently of this, when preparing the second metal salt aqueous solution for forming the shell, in distilled water to satisfy (Ni 0.64 co 0.23 mn 0.13 )(OH) 2 The various raw materials were mixed in a stoichiometric molar ratio such that the molar concentration of the...

preparation example 2

[0192] Preparation example 2 (small particle size cathode active material precursor)

[0193] 1) Preparation of metal salt solution

[0194] The same first metal salt aqueous solution and second metal salt aqueous solution as in Preparation Example 1 were prepared.

[0195] 2) Co-precipitation process

[0196] Utilize the same reactor as Preparation Example 1, other conditions are the same, but the input time and input amount of various metal salt solutions are different.

[0197] Specifically, while the first metal salt aqueous solution was fed at a rate of 0.4 liter / hour, the impeller speed of the reactor was adjusted to 140 rpm, and the co-precipitation reaction was performed until the diameter of the precipitate became about 3.8 μm to 4.5 μm . At this time, the flow rate is adjusted so that the average residence time of the solution in the reactor is about 10 hours. After the reaction reaches a normal state, the reactant is given a normal state duration to obtain ...

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Abstract

The present invention proposes a concentration gradient form capable of simultaneously achieving high capacity and structure stabilization, and a doping element capable of appropriately controlling the shape and size of primary particles for nickel-based lithium metal oxides.

Description

technical field [0001] The invention relates to a positive electrode active material, a preparation method thereof and a lithium secondary battery comprising the material. Background technique [0002] The positive electrode active material, one of the components of lithium secondary batteries, not only directly contributes to the performance of battery energy density, but also becomes a major factor that determines life characteristics and the like. [0003] In connection with this, research on layered structure nickel-based lithium metal oxides such as so-called NCM (nickel-cobalt-lithium manganese oxide) is vigorously carried out because the higher the nickel (Ni) content, the higher the capacity. [0004] However, the nickel-based lithium metal oxide has a problem that the higher the nickel content, the more unstable the structure. [0005] In addition, the nickel-based lithium metal oxide is sensitive to the temperature at which the precursor nickel-based metal hydroxi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36C01G53/00H01M4/525H01M4/131H01M10/0525
CPCH01M4/131H01M4/525H01M10/0525C01G53/00H01M4/1391Y02E60/10H01M4/366C01G53/42Y02P70/50H01M4/134H01M2004/028
Inventor 南相哲李尚奕
Owner 浦项控股股份有限公司
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