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Isolating membrane, preparation method thereof, lithium ion secondary battery and device

A technology of separator and porous base film, applied in secondary batteries, batteries, battery pack components, etc., can solve the problems of reducing the weight and energy density of lithium-ion batteries, easy to pierce the separator, and a large proportion of boehmite, etc. Achieve the effects of improving thermal stability and chemical stability, increasing physical area, and excellent heat shrinkage resistance

Pending Publication Date: 2020-04-24
CONTEMPORARY AMPEREX TECH CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is a problem of agglomeration in the CCS production process, which causes particles to appear on the separator coated with CCS, and it is easy to puncture the separator during hot pressing, and the specific gravity of boehmite is large, which will reduce the gravimetric energy density of lithium-ion batteries.
In addition, it has not been possible to find other isolation film materials with good heat resistance, mature development and reasonable price.

Method used

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  • Isolating membrane, preparation method thereof, lithium ion secondary battery and device

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preparation example Construction

[0025] According to the second aspect of the present application, the embodiment of the present application provides the preparation method of the above-mentioned separator, which includes: (1) mixing polyimide nanosheets, adhesives and deionized water to obtain polyimide nanosheets An aqueous sheet dispersion liquid; wherein, the polyimide nano sheet and the binder have a mass percent content of 6-50%, and the balance is deionized water. (2) coating the aqueous dispersion of polyimide nanosheets on at least one surface of the porous base film to form a functional coating, the thickness ratio of the functional coating to the porous base film is 0.1 to 1.0, Dry to obtain the isolation film.

[0026] In the above-mentioned preparation method provided by the present application, the formulation of the polyimide nanosheet aqueous dispersion is adjusted so that the formed dispersion has very good stability, and the stable slurry is applied to the bare surface by coating technology. ...

Embodiment 1-23

[0034] (1) Preparation of separator

[0035] Mix the polyimide nanosheets, binder and deionized water to obtain an aqueous dispersion of polyimide nanosheets; wherein, the polyimide nanosheets and binder are mixed in the polyimide nanosheet aqueous dispersion The total mass percent content ranges from 6 to 50 percent, wherein the ratio of the polyimide nano sheet to the binder is: 5 to 40:60 to 95 by mass.

[0036] The aqueous dispersion of polyimide nanosheets is coated on both surfaces of the polyolefin base film by coating equipment commonly used in the art to form a functional coating, and the thickness of the functional coating and the porous base film is The ratio is 0.1-1.0, and it is dried at 60-80° C. to obtain a separator.

[0037] (2) Preparation of positive pole piece

[0038] The positive electrode active material lithium cobaltate, the conductive agent conductive carbon, and the binder polyvinylidene fluoride (PVDF) are uniformly mixed at a mass ratio of 96:2:2...

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Abstract

The invention provides an isolating membrane, a preparation method thereof, a lithium ion secondary battery and a device. The isolating membrane provided by the invention comprises a porous base membrane and a functional coating arranged on at least one surface of the porous base membrane. The functional coating comprises polyimide nanosheets, and the polyimide nanosheets are irregularly stacked to form a lamellar loose structure. The thickness ratio of the functional coating to the porous base membrane is 0.1 to 1.0. The invention further provides the preparation method of the isolating membrane, the lithium ion secondary battery comprising the isolating membrane and a device. The isolating membrane provided by the invention has relatively good thermal stability and chemical stability, can effectively resist mechanical puncture of lithium dendrites, avoids micro short circuit, and improves the cycle performance of the battery.

Description

technical field [0001] The present application relates to the technical field of electrochemical devices, in particular to a separator, a preparation method thereof, a lithium-ion secondary battery and a device. Background technique [0002] In the lithium-ion battery structure, the separator is one of the key inner components, which has an important impact on the overall performance of the lithium-ion battery. Lithium-ion batteries with excellent performance require that the separator used not only have the basic properties of ordinary separators, but also have excellent high temperature resistance. The melting point of the conventional PE separator used in the existing lithium-ion battery is 130°C, and when the temperature reaches 150°C, the separator will shrink by more than 30%, which may cause the cathode and anode inside the lithium-ion battery to be short-circuited, causing the battery to A great security risk. [0003] At present, the main means to solve the proble...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M2/18H01M2/14H01M10/0525B82Y40/00
CPCH01M10/0525B82Y40/00H01M2220/20H01M50/403H01M50/463H01M50/411Y02E60/10H01M50/417H01M50/414H01M50/443H01M50/449B82Y30/00H01M50/42H01M50/4295H01M50/454
Inventor 李伟靳超史海浩李谦
Owner CONTEMPORARY AMPEREX TECH CO
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