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Lithium ion battery and separator thereof

A technology for lithium-ion batteries and separators, applied in secondary batteries, battery pack components, circuits, etc., can solve the problem of mutual extrusion of pole pieces, compression of coating thickness, and influence on the expansion force of lithium-ion batteries. Lithium-ion battery cycle performance and safety performance, so as to improve the ability to withstand expansion force, improve cycle life and safety performance, and improve the effect of Gap making ability

Active Publication Date: 2017-10-24
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 separator thereof
  • Lithium ion battery and separator thereof
  • Lithium ion battery and separator thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-1

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

[0032] The preparation of the negative pole piece: the negative active material graphite, the conductive agent conductive carbon, the thickener sodium carboxymethyl cellulose (CMC), and the binder styrene butadiene rubber (SBR) are made at a mass ratio of 97:1:1:1 To form a lithium-ion battery negative electrode slurry; evenly coat the nega...

Embodiment 2-1

[0053] The preparation of the positive pole piece: the positive active material nickel-cobalt-manganese ternary material NCM (Ni:Co:Mn=4:3:3), conductive agent conductive carbon, and binder polyvinylidene fluoride (PVDF) according to the mass ratio of 96 :2:2 is mixed uniformly to make a lithium-ion battery cathode slurry with a certain viscosity; the anode slurry is evenly coated on the anode current collector aluminum foil, dried at 85°C, then cold pressed, and then trimmed and cut , Slitting: After slicing, dry it under vacuum conditions and 85°C for 4 hours, and weld the positive electrode tabs to make the positive electrode of the lithium ion battery.

[0054] The preparation of the negative pole piece: the negative active material graphite, conductive agent conductive carbon, thickener sodium carboxymethyl cellulose (CMC), binder styrene butadiene rubber (SBR) are made at a mass ratio of 97:1:1:1 To form a lithium-ion battery negative electrode slurry; evenly coat the negat...

Embodiment 3-1

[0075] The preparation of the positive pole piece: The positive active material nickel-cobalt-manganese ternary material NCM (N:C:M=4:3:3), conductive agent conductive carbon, binder polyvinylidene fluoride (PVDF) according to the mass ratio of 96 :2:2 is mixed uniformly to make a lithium-ion battery cathode slurry with a certain viscosity; the anode slurry is evenly coated on the anode current collector aluminum foil, dried at 85°C, then cold pressed, and then trimmed and cut , Slitting: After slicing, it is dried for 4 hours under vacuum conditions and 85°C, and the positive electrode tab is welded to make the positive pole piece of the lithium ion battery.

[0076] The preparation of the negative pole piece: the negative active material graphite, the conductive agent conductive carbon, the thickener sodium carboxymethyl cellulose (CMC), and the binder styrene butadiene rubber (SBR) are made at a mass ratio of 97:1:1:1 To form a lithium-ion battery negative electrode slurry; ev...

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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 present invention belongs to the field of lithium ion batteries. More specifically, the present invention relates to a lithium ion battery with ideal cycle performance and an isolation film thereof. Background technique [0002] As an important part of lithium ion batteries, the separator has an important influence 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 pieces will expand to a certain extent during the recycling process. As the pole pieces continue to expand, the overall expansion force of the battery core gradually increases, which will cause the risk of mutual compression between the pole pieces , Which in turn affects the cycle performance...

Claims

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Application Information

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Patent Type & Authority Applications(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