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Lithium-ion battery and its separator

A lithium-ion battery and separator technology, which is applied in secondary batteries, battery pack components, circuits, etc., can solve the problem of compression coating thickness, mutual extrusion of pole pieces, affecting the expansion force of lithium-ion batteries. The cycle performance of lithium-ion batteries And safety performance and other issues, to achieve the effect of improving the ability to make Gap, improve cycle life and safety performance, and improve the ability to withstand expansion force

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] After the lithium-ion battery is manufactured, the cathode and anode sheets will expand to a certain extent during the cycle of use. As the pole pieces continue to expand, the expansion force on the battery cell as a whole will gradually increase, which will lead to the risk of mutual extrusion between the pole pieces. , thereby affecting the cycle performance and safety performance of lithium-ion batteries
At the same time, during the preparation process of the isolation film, due to the relatively loose distribution of the coating particles, after coating and winding (the coating machine and the winding machine have a certain tension), the coating particles will cause micro-wrinkling of the isolation film. Island-shaped and / or strip-shaped organic coatings will sink into micro-wrinkled pits, which is equivalent to compressing the thickness of the coating, thereby affecting the consistency of the thickness of the organic coating on the surface of the separator substrate, thus affecting the durability of the lithium-ion battery. The expansion force and the cycle performance and safety performance of lithium-ion batteries

Method used

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  • Lithium-ion battery and its separator
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  • Lithium-ion battery and its separator

Examples

Experimental program
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Effect test

Embodiment 1-1

[0031] Preparation of the positive electrode sheet: the positive active material ternary material NCM (Ni:Co:Mn=4:3:3), the conductive agent conductive carbon, and the binder polyvinylidene fluoride (PVDF) in a mass ratio of 96:2: 2 Mix evenly to make a lithium-ion battery cathode slurry with a certain viscosity; evenly coat the cathode slurry on the aluminum foil of the positive electrode current collector, dry it at 85°C and then cold press it, then trim, cut into pieces, and divide into strips ; After slitting, dry under vacuum conditions and 85°C for 4 hours, weld the positive tabs, and make the positive pole pieces of lithium-ion batteries.

[0032] Preparation of negative electrode sheet: Negative electrode active material graphite, conductive agent conductive carbon, thickener sodium hydroxymethyl cellulose (CMC), binder styrene-butadiene rubber (SBR) are prepared according to the mass ratio of 97:1:1:1 Lithium-ion battery negative electrode slurry; the negative electro...

Embodiment 2-1

[0053] Preparation of the positive pole piece: the positive active material nickel-cobalt-manganese ternary material NCM (Ni:Co:Mn=4:3:3), the conductive agent conductive carbon, and the binder polyvinylidene fluoride (PVDF) in a mass ratio of 96 : 2:2 mixed evenly to make a lithium-ion battery positive electrode slurry with a certain viscosity; evenly coat the positive electrode slurry on the aluminum foil of the positive electrode current collector, dry it at 85°C and then cold press it, then trim and cut into pieces , slitting; after slitting, dry in vacuum condition at 85°C for 4 hours, weld the positive tab, and make the positive pole piece of lithium-ion battery.

[0054] Preparation of negative electrode sheet: Negative electrode active material graphite, conductive agent conductive carbon, thickener sodium hydroxymethyl cellulose (CMC), binder styrene-butadiene rubber (SBR) are prepared according to the mass ratio of 97:1:1:1 Lithium-ion battery negative electrode slur...

Embodiment 3-1

[0075] Preparation of the positive pole piece: the positive active material nickel-cobalt-manganese ternary material NCM (N:C:M=4:3:3), the conductive agent conductive carbon, and the binder polyvinylidene fluoride (PVDF) in a mass ratio of 96 : 2:2 mixed evenly to make a lithium-ion battery positive electrode slurry with a certain viscosity; evenly coat the positive electrode slurry on the aluminum foil of the positive electrode current collector, dry it at 85°C and then cold press it, then trim and cut into pieces , slitting; after slitting, dry in vacuum condition at 85°C for 4 hours, weld the positive tab, and make the positive pole piece of lithium-ion battery.

[0076] Preparation of negative electrode sheet: Negative electrode active material graphite, conductive agent conductive carbon, thickener sodium hydroxymethyl cellulose (CMC), binder styrene-butadiene rubber (SBR) are prepared according to the mass ratio of 97:1:1:1 Lithium-ion battery negative electrode slurry;...

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Abstract

The invention discloses a lithium ion battery separator. The lithium ion battery separator comprises a separator substrate, an inorganic coating layer and an organic coating layer, wherein the inorganic coating layer is arranged on at least one surface of the separator substrate, the organic coating layer is arranged on the at least one inorganic coating layer, and the coating density of the organic coating layer is (0.1-10)mg / 1,540.25mm<2>. Compared with the prior art, the lithium ion battery separator has the advantages that the deformation of a lithium ion battery and the expansibility which the lithium ion battery cell can bear can be improved, so that the cycle lifetime of the lithium ion battery is prolonged. Moreover, the invention also discloses the lithium ion battery employing the lithium ion battery separator.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, more specifically, the invention relates to a lithium ion battery with ideal cycle performance and a separator thereof. Background technique [0002] As an important part of lithium-ion batteries, the separator has an important impact on the cycle life of lithium-ion batteries. Existing lithium-ion battery separators generally include a separator substrate, an inorganic coating coated on at least one side of the separator substrate, and an organic coating coated on at least one side of the inorganic coating. [0003] After the lithium-ion battery is manufactured, the cathode and anode sheets will expand to a certain extent during the cycle of use. As the pole pieces continue to expand, the expansion force on the battery cell as a whole will gradually increase, which will lead to the risk of mutual extrusion between the pole pieces. , thereby affecting the cycle performance and safety perform...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/16H01M10/0525
CPCH01M10/0525H01M50/411H01M50/44Y02E60/10
Inventor 陈仕通陶兴华张盛武程文强
Owner NINGDE AMPEREX TECH