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Lithium ion battery composite positive electrode material and preparation method

A composite cathode material, lithium-ion battery technology, applied in battery electrodes, lithium storage batteries, secondary batteries, etc., can solve the problem of thick coating thickness, the coating layer cannot take into account the dynamic performance and electrochemical stability, and increase the internal resistance. And other issues

Active Publication Date: 2021-04-09
BEIJING WELION NEW ENERGY TECH CO LTD
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  • Summary
  • 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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  • Lithium ion battery composite positive electrode material and preparation method
  • Lithium ion battery composite positive electrode material and preparation method
  • Lithium ion battery composite positive electrode material and preparation method

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 positive electrode material and a preparation method thereof, and belongs to the technical field of lithium ion batteries. The composite positive electrode material comprises a positive electrode body material and a composite coating layer, and is prepared by uniformly dispersing a precursor of the composite coating layer in a liquid phase system, attaching the precursor to the surface of the positive electrode body material, performing drying and sintering at high temperature. According to the lithium ion battery composite positive electrode material disclosed by the invention, the rate capability, the cycle life, the thermal stability and the safety performance of the material are effectively improved, the stability of the composite positive electrode material is improved, and the problem of capacity reduction caused by composite coating of the positive electrode body material is solved; meanwhile, the compatibility of the material in a liquid lithium ion battery, a mixed solid-liquid lithium ion battery, a mixed solid-liquid metal lithium battery, an all-solid-state lithium ion battery and an all-solid-state metal lithium battery system is well 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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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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