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Composite positive electrode material for lithium ion battery and preparation method and application of composite positive electrode material

A composite cathode material, lithium-ion battery technology, applied in battery electrodes, positive electrodes, secondary batteries, etc., can solve the problems of limited electrochemical performance, poor electrical conductivity and structural stability, and low electrical conductivity.

Active Publication Date: 2020-08-04
SVOLT ENERGY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, due to the lack of cobalt element, its electrical conductivity is low. Compared with traditional ternary materials such as NCM and NCA, poor electrical conductivity and structural stability are major problems, which in turn are subject to certain constraints in terms of electrochemical performance.

Method used

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  • Composite positive electrode material for lithium ion battery and preparation method and application of composite positive electrode material
  • Composite positive electrode material for lithium ion battery and preparation method and application of composite positive electrode material
  • Composite positive electrode material for lithium ion battery and preparation method and application of composite positive electrode material

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Embodiment 1

[0060] This embodiment provides a composite positive electrode material for a lithium ion battery, the composite positive electrode material includes a positive electrode material core and a halide coating layer coated on the surface of the positive electrode material core core, and the positive electrode material core is LiNi 0.75 mn 0.25 o 2 , the halide is Li 3 YCl 6 , taking the mass of the core of the positive electrode material as 100%, the Li 3 YCl 6 The content of element Y in the medium is 0.5%, and the particle diameter D50 of the inner core of the positive electrode material is 3 μm.

[0061] This embodiment also provides a preparation method of the composite positive electrode material, comprising the following steps:

[0062] (1) Preparation of matrix cathode material lithium nickel manganese oxide

[0063] (a) LiOH and precursor Ni 0.75 mn 0.25 (OH) 2 In a high-speed mixing device, mix for 15 minutes at a speed of 2500 rpm;

[0064] (b) Under an oxygen ...

Embodiment 2

[0067] This embodiment provides a composite positive electrode material for a lithium ion battery, the composite positive electrode material includes a positive electrode material core and a halide coating layer coated on the surface of the positive electrode material core core, and the positive electrode material core is LiNi 0.6 mn 0.4 o2 , the halide is Li 3 YBr 6 , taking the mass of the core of the positive electrode material as 100%, the Li 3 YBr 6 The content of element Y in the medium is 0.3%, and the particle diameter D50 of the inner core of the positive electrode material is 3 μm.

[0068] This embodiment also provides a preparation method of the composite positive electrode material, comprising the following steps:

[0069] (1) Preparation of matrix cathode material lithium nickel manganese oxide

[0070] (a) LiOH and precursor Ni 0.6 mn 0.4 (OH) 2 In a high-speed mixing device, mix for 20 minutes at a speed of 2000 rpm;

[0071] (b) Under an oxygen atmosp...

Embodiment 3

[0074] This embodiment provides a composite positive electrode material for a lithium ion battery, the composite positive electrode material includes a positive electrode material core and a halide coating layer coated on the surface of the positive electrode material core core, and the positive electrode material core is LiNi 0.7 mn 0.3 o 2 , the halide is Li 3 YCl 6 , taking the mass of the core of the positive electrode material as 100%, the Li 3 YCl 6 The content of element Y in the medium is 0.8%, and the particle diameter D50 of the inner core of the positive electrode material is 3 μm.

[0075] This embodiment also provides a preparation method of the composite positive electrode material, comprising the following steps:

[0076] (1) Preparation of matrix cathode material lithium nickel manganese oxide

[0077] (a) will Li 2 CO 3 and precursor Ni 0.7 mn 0.3 (OH) 2 In a high-speed mixing device, mix for 16 minutes at a speed of 2800 rpm;

[0078] (b) Under an...

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Abstract

The invention discloses a composite positive electrode material for a lithium ion battery and a preparation method and application of the composite positive electrode material. The composite positiveelectrode material comprises a positive electrode material core and a halide coating layer coating the surface of the positive electrode material core. The halide comprises Li3YX6, and X is at least one of halogens. According to the halide-coated positive electrode material disclosed by the invention, through coating of the halide coating layer, the ionic conductivity and the structural stabilityof the positive electrode material are greatly improved, and the surface impedance of the material is reduced, so that the capacity, the first effect and the cycle performance of the material are improved.

Description

technical field [0001] The invention belongs to the technical field of batteries, and relates to a composite positive electrode material for a lithium ion battery, a preparation method and application thereof, in particular to a halide-coated composite positive electrode material, a preparation method and an application thereof. Background technique [0002] Lithium-ion batteries have penetrated into all aspects of life due to their high energy density and good cycle performance. As the core of lithium-ion batteries, the development of cathode materials directly affects the development prospects of lithium-ion batteries. Due to the high density and good cycle life of ternary cathode materials, they are widely used in automobiles and electronics industries. Among them, NCM (Ni x co y mn z ), NCA (Ni x co y al z ), etc., but cobalt is expensive and pollutes the environment. These unfavorable factors limit the development of ternary materials. [0003] The advantages of ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M4/131H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M4/624H01M4/628H01M4/131H01M10/0525H01M2004/021H01M2004/028Y02E60/10H01M4/582H01M4/1315
Inventor 许鑫培杨红新江卫军乔齐齐孙明珠施泽涛王鹏飞马加力陈思贤
Owner SVOLT ENERGY TECHNOLOGY CO LTD
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