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Lithium-ion battery and its coated separator

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

Active Publication Date: 2020-11-27
NINGDE AMPEREX TECH
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  • Summary
  • 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 its coated separator
  • Lithium-ion battery and its coated separator
  • Lithium-ion battery and its coated separator

Examples

Experimental program
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Effect test

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 diaphragm used therein. The coating diaphragm includes a porous substrate and a coating coated on the surface of the porous substrate; the porous substrate includes a first surface and a second surface opposite to the first surface; the coating includes a coating on the porous substrate A first coating on the first surface and a second coating on the second surface of the porous substrate; both the first coating and the second coating include an adhesive polymer, and the adhesive polymer in the first coating The mass fraction of the substance is less than the mass fraction of the adhesive polymer in the second coating. Compared with the prior art, the present invention carries out different diaphragm coating designs according to the positive and negative electrodes, so that the lithium-ion battery can meet the requirements of the battery for hardness and dynamic characteristics at the same time.

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