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Preparation method of lithium ion battery cathode

A lithium-ion battery and cathode technology, which is applied in the field of preparation of lithium-ion battery cathodes, can solve the problems of accelerating the surface side reactions of electrode materials, limiting application, impairing the structural stability and long-cycle performance of electrode materials, etc. Cyclic performance, effect of improving structural stability

Inactive Publication Date: 2020-07-28
朱虎
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Lithium nickel manganese cobalt oxide material is a high-voltage cathode material with high energy density and good rate performance; however, its own high operating voltage will significantly accelerate the side reactions on the surface of the electrode material, which seriously damages the structural stability of the electrode material and long-term cycle performance, which limits its application in high specific energy power batteries

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 1) Add NMP to the stirred tank, add PVDF, stir, then add acetylene black and LiNi 0.35 mn 0.4 co 0.2 al 0.05 o 2 , and stir evenly to obtain the first slurry, wherein the solid content is 60%;

[0027] 2) Add NMP to the stirred tank, add PVDF, stir, then add acetylene black and LiNi 0.2 mn 0.5 co 0.27 al 0.03 o 2 , stir evenly to obtain the second slurry, wherein the solid content is 60%;

[0028] 3) Add NMP to the stirred tank, add PVDF, stir, then add acetylene black and LiNi 0.15 mn 0.55 co 0.28 al 0.02 o 2 , and stir evenly to obtain the third slurry, wherein the solid content is 60%;

[0029] 4) According to LiNi 0.35 mn 0.4 co 0.2 al 0.05 o 2 , LiNi 0.2 mn 0.5 co 0.27 al 0.03 o 2 and LiNi 0.15 mn 0.55 co 0.28 al 0.02 o 2 The mass ratio is the ratio of 55:30:15 and the first slurry, the second slurry and the third slurry are mixed, and NMP is added to adjust the solid content to obtain the first layer of slurry, and the solid content of...

Embodiment 2

[0034] 1) Add NMP to the stirred tank, add PVDF, stir, then add acetylene black and LiNi 0.35 mn 0.4 co 0.2 al 0.05 o 2 , and stir evenly to obtain the first slurry, wherein the solid content is 65%;

[0035] 2) Add NMP to the stirred tank, add PVDF, stir, then add acetylene black and LiNi 0.2 mn 0.5 co 0.27 al 0.03 o 2 , stir evenly to obtain the second slurry, wherein the solid content is 65%;

[0036] 3) Add NMP to the stirred tank, add PVDF, stir, then add acetylene black and LiNi 0.15 mn 0.55 co 0.28 al 0.02 o 2 , and stir evenly to obtain the third slurry, wherein the solid content is 65%;

[0037] 4) According to LiNi 0.35 mn 0.4 co 0.2 al 0.05 o 2 , LiNi 0.2 mn 0.5 co 0.27 al 0.03 o 2 and LiNi 0.15 mn 0.55 co 0.28 al 0.02 o 2 The mass ratio is the ratio of 60:20:20 the first slurry, the second slurry and the third slurry are mixed, NMP is added to adjust the solid content, and the slurry of the first layer is obtained, and the solid content...

Embodiment 3

[0042] 1) Add NMP to the stirred tank, add PVDF, stir, then add acetylene black and LiNi 0.35 mn 0.4 co 0.2 al 0.05 o 2 , stir evenly to obtain the first slurry, wherein the solid content is 62%;

[0043] 2) Add NMP to the stirred tank, add PVDF, stir, then add acetylene black and LiNi 0.2 mn 0.5 co 0.27 al 0.03 o 2 , stir evenly to obtain the second slurry, wherein the solid content is 62%;

[0044] 3) Add NMP to the stirred tank, add PVDF, stir, then add acetylene black and LiNi 0.15 mn 0.55 co 0.28 al 0.02 o 2 , stir evenly to obtain the third slurry, wherein the solid content is 62%;

[0045] 4) According to LiNi 0.35 mn 0.4 co0.2 al 0.05 o 2 , LiNi 0.2 mn 0.5 co 0.27 al 0.03 o 2 and LiNi 0.15 mn 0.55 co 0.28 al 0.02 o 2 The mass ratio is the ratio of 58:25:17 and the first slurry, the second slurry and the third slurry are mixed, and NMP is added to adjust the solid content to obtain the first layer of slurry, and the solid content of the slurr...

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Abstract

The invention provides a preparation method of a cathode of a lithium ion battery, wherein the active substance layer of the cathode of the lithium ion battery comprises a first layer, a second layerand a third layer, and the active substances comprise LiNi0.35Mn0.4Co0.2Al0.05O2, LiNi0.2Mn0.5Co0.27Al0.03O2 and LiNi0.15Mn0.55Co0.28Al0.02O2. The preparation method comprises the following steps: respectively preparing LiNi0.35Mn0.4Co0.2Al0.05O2, LiNi0.2Mn0.5Co0.27Al0.03O2 and LiNi0.15Mn0.55Co0.28Al0.02O2 into slurries; preparing the slurries of a first layer, a second layer and a third layer according to a mass ratio; and sequentially coating a current collector with the slurries, and drying to acquire the battery cathode. The battery prepared by the preparation method has excellent rate capability and cycle performance.

Description

technical field [0001] The invention relates to a preparation method of a cathode of a lithium ion battery. Background technique [0002] The improvement of energy density is the focus of research in the field of lithium-ion batteries, and the cathode material is the key to determining the energy density of lithium-ion batteries. Lithium nickel manganese cobalt oxide material is a high-voltage cathode material with high energy density and good rate performance; however, its own high operating voltage will significantly accelerate the side reactions on the surface of the electrode material, which seriously damages the structural stability of the electrode material Its poor performance and long cycle performance limit its application in high specific energy power batteries. Contents of the invention [0003] The invention provides a method for preparing the cathode of a lithium-ion battery, wherein the active material layer of the cathode of the lithium-ion battery comprise...

Claims

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Application Information

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IPC IPC(8): H01M4/1391H01M4/04H01M4/131H01M10/0525
CPCH01M4/0404H01M4/131H01M4/1391H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 朱虎
Owner 朱虎
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