Lithium ion battery and coating separator thereof

A lithium-ion battery and coating technology, applied in secondary batteries, battery pack components, circuits, etc., can solve the problem of not taking into account the difference in demand between positive and negative electrodes, and cannot meet high adhesion and high dynamics at the same time. problem, to achieve the effect of low expansion, long cycle life, high safety characteristics

Active Publication Date: 2018-01-19
NINGDE AMPEREX TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the existing coated separators do not take into account the difference in the requirements of the positive and negative electrodes, resulting in the inability to meet the requirements of high adhesion and high kinetics at the same time

Method used

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  • Lithium ion battery and coating separator thereof
  • Lithium ion battery and coating separator thereof
  • Lithium ion battery and coating separator thereof

Examples

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Embodiment 1

[0024] Preparation of the positive pole piece: Lithium cobaltate, conductive carbon (Super-P), and binder (PVDF) were evenly mixed at a mass ratio of 96:2:2 to make a positive electrode slurry with a certain viscosity, and the slurry was coated with Clothed on aluminum foil, dried at 85°C, cold-pressed, stripped, vacuum baked, cut into pieces, and welded to tabs to make positive pole pieces for lithium-ion batteries.

[0025] Preparation of negative electrode sheet: Mix graphite, conductive carbon (Super-P), thickener (CMC), and binder (SBR) in a mass ratio of 96.5:1:1:1.5 to make negative electrode slurry and then coat Clothed on copper foil, dried at 85°C, then cold-pressed, stripped, vacuum baked, cut into pieces, and welded to tabs to make negative pole pieces for lithium-ion batteries.

[0026] Preparation of coated separators (hybrid coating):

[0027] 1) Preparation of the first coating slurry: thermally stable filler (Al 2 o 3 ), an adhesive polymer (copolymerized P...

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Abstract

The invention discloses a lithium ion battery and a coating separator used by the same. The coating separator comprises a porous substrate and a coating layer, wherein the coating layer is coated on asurface of the porous substrate, the porous substrate comprises a first surface and a second surface, the facing directions of the first surface and the second surface are opposite, the coating layercomprises a first coating layer and a second coating layer, the first coating layer is arranged on the first surface of the porous substrate, the second coating layer is arranged on the second surface of the porous substrate, the first coating layer and the second coating layer both comprise adhesive polymers, and the mass percent of the adhesive polymer in the first coating layer is smaller thanthat of the adhesive polymer in the second coating layer. Compared with the prior art, the coating separator has the advantages that different separator coating layers are designed according to a positive electrode and a negative electrode, so that the lithium ion battery can simultaneously conform to requirements of the battery on hardness and dynamic characteristic.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and more specifically, the invention relates to a high-performance lithium-ion battery and a coating diaphragm thereof. Background technique [0002] As an important part of lithium-ion batteries, separators have an important impact on various performances such as safety, cycle life, and kinetic characteristics of lithium-ion batteries. Existing separators for lithium-ion batteries are usually coated separators, which include a porous substrate and coatings coated on one or both sides of the porous substrate. [0003] However, the existing coated separators do not take into account the differences in the requirements of the positive and negative electrodes, resulting in the inability to meet the requirements of high adhesion and high kinetics at the same time. [0004] In view of this, it is necessary to provide a lithium-ion battery coating separator capable of solving the above-m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M10/0525H01M50/411H01M50/457
CPCY02E60/10
Inventor 张新枝
Owner NINGDE AMPEREX TECH
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