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High-nickel positive pole piece as well as preparation method and application thereof

A positive pole piece, high-nickel technology, applied in the direction of electrode manufacturing, battery electrodes, electrode heat treatment, etc., can solve the problem that the positive electrode material cannot be well protected, the inorganic oxide nanoparticles are difficult to be evenly distributed, and the lithium-ion battery is affected. Dynamic performance and other issues

Pending Publication Date: 2021-11-09
SINOCHEM INT CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that the inorganic oxide nanoparticles sprayed on the positive electrode material layer are difficult to distribute evenly, and cannot protect the positive electrode material well. In addition, the inorganic oxide materials sprayed have poor electrical conductivity, which will affect lithium ionization. Kinetic performance of ion batteries

Method used

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  • High-nickel positive pole piece as well as preparation method and application thereof
  • High-nickel positive pole piece as well as preparation method and application thereof
  • High-nickel positive pole piece as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0100] (1) Preparation of positive pole piece

[0101] Preparation of high-nickel layer slurry: the mass ratio of each component of the high-nickel layer is LiNi 0.85 co 0.1 mn 0.05 o 2 : SP: VGCF: PVDF = 98.0: 0.77: 0.03: 1.2, the solvent is NMP, according to the order of glue (configure the PVDF glue with a mass fraction of 5%), add VGCF, add SP, and finally add the positive electrode material. The viscosity is adjusted to 4000mPa·s, and after the viscosity adjustment is completed, the slurry is evacuated and stored for later use.

[0102] Preparation of low-nickel layer slurry: the mass ratio of each component of the low-nickel layer is LiNi 0.6 co 0.1 mn 0.3 o 2 : SP: PVDF=96.0: 1.50: 2.5, the low-nickel layer binder content is 2.08 times of the high-nickel layer binder content, the solvent is NMP, according to glue (configuration mass fraction is 5% PVDF glue), Add SP and finally add the positive electrode material in order to adjust the viscosity to 4000mPa·s. Af...

Embodiment 2

[0126] (1) Preparation of positive pole piece

[0127] Preparation of high-nickel layer slurry: the distribution ratio of each component of the high-nickel layer is LiNi 0.82 co 0.1 mn 0.08 o 2 : SP: VGCF: PVDF = 97.45: 1.0: 0.05: 1.5, the solvent is NMP, according to the glue (configure the PVDF glue with a mass fraction of 5%), add VGCF, add SP, and finally add the positive electrode material. Adjust the viscosity to 3500mPa·s. After the viscosity adjustment is completed, the slurry is vacuumed and stored for later use.

[0128] Preparation of low-nickel layer slurry: the distribution ratio of the components of the low-nickel layer is LiNi 0.65 co 0.15 mn 0.2 o 2 : SP: PVDF=96.0: 1.50: 2.5, the low-nickel layer binder content is 1.67 times of the high-nickel layer binder content, the solvent is NMP, according to the glue (configuration mass fraction is 5% PVDF glue), Add SP and finally add the positive electrode material in order to adjust the viscosity to 3500mPa·s....

Embodiment 3

[0142] (1) Preparation of positive pole piece

[0143] Preparation of high-nickel layer slurry: the mass ratio of each component of the high-nickel layer is LiNi 0.8 co 0.15 al 0.05 o 2 : SP: VGCF: PVDF = 98.0: 0.67: 0.03: 1.3, the solvent is NMP, according to the glue (configure the PVDF glue with a mass fraction of 5%), add VGCF, add SP, and finally add the positive electrode material. Adjust the viscosity to 4500mPa·s. After the viscosity adjustment is completed, the slurry is vacuumed and stored for later use.

[0144] Preparation of low-nickel layer slurry: the distribution ratio of the components of the low-nickel layer is LiNi 0.65 co 0.15 mn 0.2 o 2 : SP: PVDF=96.0: 1.50: 2.5, the low-nickel layer binder content is 1.92 times of the high-nickel layer binder content, the solvent is NMP, according to glue (configuration mass fraction is 5% PVDF glue), Add SP and finally add the positive electrode material in order to adjust the viscosity to 4500mPa·s. After the v...

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Abstract

The invention provides a high-nickel positive pole piece as well as a preparation method and application thereof. The high-nickel positive pole piece sequentially comprises a first low-nickel layer, a first high-nickel layer, an aluminum foil, a second high-nickel layer and a second low-nickel layer in the thickness direction, wherein each of the high-nickel layers and the low-nickel layers comprises a positive pole material, a binder and a conductive agent. The nickel content of the positive electrode material in the high-nickel layer is higher than that of the positive electrode material in the low-nickel layer, and the binder content of the low-nickel layer is 1.5-3 times that of the high-nickel layer. The positive electrode material in the high-nickel positive electrode plate is not easy to damage by free acid and is not easy to pulverize, and the cycle life of the high-nickel positive electrode plate is prolonged.

Description

technical field [0001] The invention belongs to the field of lithium-ion battery materials, and in particular relates to a high-nickel positive pole piece, a preparation method and application thereof. Background technique [0002] At present, in order to improve the cruising range of new energy vehicles, lithium-ion batteries with high energy density are usually used in power batteries. High-energy-density lithium-ion battery cathodes generally use high-nickel cathode materials. Common high-nickel cathode materials include ternary nickel-cobalt-manganese material LiNi 1-x-y co x mn y o 2 (0<x<1, 0<y<1, 0<x+y≦0.3), ternary nickel-cobalt-aluminum material LiNi 1-x- y co x Al y o 2 (0<x<1, 0<y<1, 0<x+y≦0.3), lithium-rich manganese-based cathode material xLi 2 MnO 3 ·(1-x)LiMO 2 (M contains Ni, Co and Mn, 0<x<1). The internal lattice expansion of the high-nickel cathode material is more obvious during the charge-discharge cycle. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/131H01M4/1391H01M4/04H01M10/0525
CPCH01M4/131H01M4/1391H01M4/0404H01M4/0471H01M10/0525H01M2220/20Y02E60/10
Inventor 凌红亚
Owner SINOCHEM INT CORP
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