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Positive electrode active material and application thereof

A cathode active material, cathode technology, applied in battery electrodes, structural parts, electrical components, etc., to solve the deterioration of kinetic performance, improve stability, and improve electrochemical performance.

Active Publication Date: 2022-06-03
ENVISION DYNAMICS TECH (JIANGSU) CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The object of the present invention is to provide a kind of positive electrode active material and its application, especially provide a kind of low-cost high-performance positive electrode active material and its application, described positive electrode active material has low cobalt content, can reduce the cost of ternary material, At the same time, it can solve a series of problems caused by the reduction of cobalt content. Starting from the structure of low-cobalt ternary materials, it can meet the performance requirements while ensuring low cost and high energy density.

Method used

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  • Positive electrode active material and application thereof
  • Positive electrode active material and application thereof
  • Positive electrode active material and application thereof

Examples

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Embodiment 1

[0063] This embodiment provides a positive electrode active material, and the chemical formula of the positive electrode active material is LiNi 0.55 Co 0.1 Mn 0.35 Al 0.01 O 2 , the structure is spherical polycrystalline, and the particle size of the secondary particles is D 50 is 4.5μm;

[0064] One of the secondary particles is composed of 5 to 8 primary particles, and the particle size of the primary particles is D 50 is 1.5μm;

[0065] The preparation method of the positive electrode active material comprises the following steps:

[0066] (a) Ni in a molar ratio of 1:1.06:0.01 0.55 Co 0.10 Mn 0.35 (OH) 2 , lithium hydroxide and micron-sized alumina were mixed for 1.5h at a rotating speed of 800r / min to obtain a mixture;

[0067] The micron-scale alumina particle size D 50 is 1.5μm;

[0068] (b) in an air atmosphere, the mixture described in step (a) was heated to 450°C at a heating rate of 3°C / min, kept at a temperature of 3h, and then heated to 860°C at a he...

Embodiment 2

[0073] This embodiment provides a positive electrode active material, and the chemical formula of the positive electrode active material is LiNi 0.1 Co 0.05 Mn 0.85 Al 0.02 O 2 , the structure is spherical polycrystalline, and the particle size of the secondary particles is D 50 is 4μm;

[0074] One of the secondary particles is composed of 5 to 8 primary particles, and the particle size of the primary particles is D 50 is 1 μm;

[0075] The preparation method of the positive electrode active material comprises the following steps:

[0076] (a) Ni with a molar ratio of 1:1.04:0.015 0.55 Co 0.10 Mn 0.35 (OH) 2 , lithium hydroxide and micron-sized alumina were mixed for 2h at a rotational speed of 700r / min to obtain a mixture;

[0077] The micron-scale alumina particle size D 50 is 0.2μm;

[0078] (b) in an air atmosphere, the mixture described in step (a) was heated to 480°C at a heating rate of 2.5°C / min, kept for 4 hours, and then heated to 890°C at a heating rat...

Embodiment 3

[0082] This embodiment provides a positive electrode active material, and the chemical formula of the positive electrode active material is LiNi 0.8 Co 0.1 Mn 0.1 Al 0.01 O 2 , the structure is spherical polycrystalline, and the particle size of the secondary particles is D 50 is 5μm;

[0083] One of the secondary particles is composed of 5 to 8 primary particles, and the particle size of the primary particles is D 50 is 2μm;

[0084] The preparation method of the positive electrode active material comprises the following steps:

[0085] (a) Ni with a molar ratio of 1:1.08:0.005 0.55 Co 0.10 Mn 0.35 (OH) 2 , lithium hydroxide and micron-sized alumina were mixed for 0.5h at a rotating speed of 900r / min to obtain a mixture;

[0086] The micron-scale alumina particle size D 50 is 3μm;

[0087] (b) in an air atmosphere, the mixture described in step (a) was heated to 420°C at a heating rate of 3.5°C / min, kept for 2 hours, and then heated to 830°C at a heating rate of ...

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Abstract

The invention provides a positive electrode active material and application thereof, the positive electrode active material is of a polycrystalline-like structure, the chemical formula of the positive electrode active material is LiNi < x > Co < y > Mn < 1-x-y > M < z > O < 2 >, x is more than 0 and less than 1, and y is more than 0 and less than or equal to 0.1, 0 lt; x + y < lt >; 1, 0.01 < = z < = 0.05, and M comprises any one or a combination of at least two of transition metal elements. The positive electrode active material with the polycrystalline-like structure has the advantages that the cobalt content is low, the cost of a ternary material can be reduced, a series of problems caused by the reduction of the cobalt content can be solved, and the performance requirements can be met while the low cost and the high energy density are ensured.

Description

technical field [0001] The invention belongs to the technical field of batteries, and relates to a positive electrode active material, in particular to a positive electrode active material and an application thereof. Background technique [0002] Ternary material LiNi x Co y Mn 1-x-y O 2 Because of its high theoretical ratio, high reaction platform voltage, and excellent reaction kinetics, it is widely used in power battery systems with high energy density. However, currently widely used ternary materials have high Co content (y is greater than 0.10), because cobalt ore is a rare mineral resource and is increasingly in short supply, and higher cobalt content increases the cost of ternary materials. [0003] The existing technology solves the cost problem by reducing the Co content of the ternary material, but the reduction of the cobalt element will also bring about the deterioration of the electrochemical performance and processing performance, such as: reduction in com...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525
CPCH01M4/525H01M4/505Y02E60/10
Inventor 杨文龙杨元婴朱呈岭莫方杰
Owner ENVISION DYNAMICS TECH (JIANGSU) CO LTD
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