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 bo

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

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Example Embodiment

[0025] According to the second aspect of the present application, the embodiments of the present application provide a method for preparing the above-mentioned isolation film, which includes: (1) mixing a polyimide nanosheet, a binder, and deionized water to obtain a polyimide nanosheet Aqueous dispersion of tablets; wherein the mass percentage of polyimide nanosheets and binder is 6-50%, and the balance is deionized water. (2) Coating the polyimide nanosheet aqueous dispersion on at least one surface of the porous base film to form a functional coating, and the thickness ratio of the functional coating to the porous base film is 0.1-1.0, After drying, an isolation film is obtained.

[0026] In the above preparation method provided in this application, the formulation of the aqueous dispersion of polyimide nanosheets is adjusted, so that the formed dispersion has very good stability, and the stable slurry is applied to the naked body by coating technology. After drying on the fi...

Example Embodiment

[0033] Example 1-23

[0034] (1) Preparation of isolation membrane

[0035] The polyimide nanosheets, the binder, and deionized water are mixed to obtain an aqueous dispersion of polyimide nanosheets; wherein the polyimide nanosheets and the binder are in the aqueous dispersion of polyimide nanosheets The total mass percentage content of the polyimide is 6-50%, and the ratio of the polyimide nanosheets and the binder is 5-40:60-95.

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

[0037] (2) Preparation of positive pole piece

[0038] The positive active material lithium cobalt oxide, conductive agent conductive carbon, and binder polyvinylidene fluoride (PVDF) are uniformly mixed in a mass ratio of 96:...

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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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