A kind of lithium-ion battery composite positive electrode material and preparation method thereof

A composite cathode material, lithium-ion battery technology, applied in battery electrodes, lithium storage batteries, secondary batteries, etc., can solve the problem that the coating layer cannot take into account the dynamic performance and electrochemical stability, the uniformity is difficult to control, and the coating thickness Thickness and other problems, to achieve the effect of improving cycle performance and safety performance, reducing residual lithium on the surface, and improving compatibility

Active Publication Date: 2022-04-15
BEIJING WELION NEW ENERGY TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese invention patent application CN108172826A forms a fusion coating layer by coating nano-scale lithium iron phosphate on the surface of high-nickel ternary material, and the cycle performance, thermal stability and safety performance of the obtained composite positive electrode material have been improved to a certain extent, but the above-mentioned coating The coating is dry coating, the uniformity is difficult to control, and the coating thickness is thick, which may increase the internal resistance
Chinese invention patent application CN107492636A uses non-metallic ions and / or polyanions to dope the cladding layer, and obtain composite positive electrode materials after sintering to improve electrochemical performance. Although the above patents have improved the surface problems of positive electrode materials, the cladding layer cannot take care of both Kinetic performance and electrochemical stability

Method used

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  • A kind of lithium-ion battery composite positive electrode material and preparation method thereof
  • A kind of lithium-ion battery composite positive electrode material and preparation method thereof
  • A kind of lithium-ion battery composite positive electrode material and preparation method thereof

Examples

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Embodiment 1

[0040] A preparation method for a lithium-ion battery composite cathode material, comprising the following steps:

[0041] (1) The bulk cathode material used in this example is LiNi with a median particle size of about 10 μm 0.8 co 0.1 mn 0.1 o 2 (sample before improvement), its SEM image is as figure 1 shown.

[0042] Add 0.02mol of ammonium dihydrogen phosphate, 0.02mol of ferrous oxalate and 0.02mol of lithium acetate into water, mix well and react completely; then add 0.028mol of lithium acetate and 0.007mol of pyrophosphoric acid, mix well and then add 1mol of LiNi 0.8 co 0.1 mn 0.1 o 2 , to obtain the positive electrode material mixture after drying.

[0043] (2) Put the above positive electrode material mixture in a nitrogen atmosphere and calcined at 720°C for 10h to obtain a lithium ion battery composite positive electrode material (improved sample) coated with a composite coating layer, wherein the composite coating layer is in the composite positive electrod...

Embodiment 2

[0053] A preparation method for a lithium-ion battery composite cathode material, comprising the following steps:

[0054] (1) The bulk cathode material used in this example is LiCoO with a median particle size of about 10 μm 2 sample.

[0055] Add 0.02mol of ammonium dihydrogen phosphate, 0.02mol of ferrous oxalate and 0.02mol of lithium acetate into water, mix well and react completely; then add 0.028mol of lithium acetate and 0.007mol of pyrophosphoric acid, mix well and then add 1mol of LiCoO 2 , to obtain the positive electrode material mixture after drying.

[0056] (2) The above positive electrode material mixture was placed in a nitrogen atmosphere and calcined at 720° C. for 10 h to obtain a lithium ion battery composite positive electrode material coated with a composite coating layer.

Embodiment 3

[0060] A preparation method for a lithium-ion battery composite cathode material, comprising the following steps:

[0061] (1) The bulk cathode material used in this example is LiNiO with a median particle size of about 10 μm 2 sample.

[0062] Add 0.02mol of ammonium dihydrogen phosphate, 0.02mol of ferrous oxalate and 0.02mol of lithium acetate into water, mix well and react completely; then add 0.028mol of lithium acetate and 0.007mol of pyrophosphoric acid, mix well and add 1mol of LiNiO 2 , to obtain the positive electrode material mixture after drying.

[0063] (2) The above positive electrode material mixture was placed in a nitrogen atmosphere and calcined at 720° C. for 10 h to obtain a lithium ion battery composite positive electrode material coated with a composite coating layer.

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Abstract

The invention discloses a lithium-ion battery composite cathode material and a preparation method, belonging to the technical field of lithium-ion batteries. The composite positive electrode material includes a positive electrode body material and a composite coating layer, which is obtained by uniformly dispersing the precursor of the composite coating layer in a liquid phase system and then adhering to the surface of the positive electrode body material, drying and sintering at high temperature. The lithium-ion battery composite positive electrode material of the present invention effectively improves the rate performance, cycle life, thermal stability and safety performance of the material, improves the stability of the composite positive electrode material, and avoids the capacity reduction of the positive electrode body material due to composite coating. At the same time, the compatibility of materials in liquid lithium-ion batteries, mixed solid-liquid lithium-ion batteries, mixed solid-liquid metal lithium batteries, all-solid-state lithium-ion batteries and all-solid-state metal lithium battery systems has been improved.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a lithium ion battery composite cathode material and a preparation method. Background technique [0002] In recent years, the power battery market has continued to explode, and new energy vehicles have entered thousands of households. However, the safety of batteries affects people's hearts. Among the various components of lithium-ion batteries, electrode materials are the core and key materials of lithium-ion batteries. The quality of electrode materials directly determines the specific energy, cycle life and load resistance of lithium-ion batteries and other key properties. At present, the common cathode materials for lithium-ion batteries mainly include layered lithium cobaltate, lithium nickelate, ternary materials, spinel-structured lithium manganate and olivine-structured lithium iron phosphate. Therefore, the development of lithium-ion battery cathode mater...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/525H01M4/58H01M4/62H01M10/052H01M10/0525
CPCH01M4/366H01M4/5825H01M4/525H01M4/505H01M4/485H01M4/62H01M4/628H01M10/052H01M10/0525Y02E60/10
Inventor 陈相雷张振宇陈一帆黄杰
Owner BEIJING WELION NEW ENERGY TECH CO LTD
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