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Lithium-ion battery separator, and preparation method and application thereof

A lithium-ion battery, separator technology, applied in secondary batteries, battery pack components, circuits, etc., can solve the problems of battery cycle performance consistency and reliability instability, safety performance needs to be further improved, etc., to achieve thermal shrinkage area It is not easy to expand, and it is beneficial to improve the stability and safety performance.

Active Publication Date: 2016-12-07
LENOVO (BEIJING) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, using the separator of the above scheme is likely to lead to unstable cycle performance consistency and reliability of the battery, and the safety performance needs to be further improved

Method used

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  • Lithium-ion battery separator, and preparation method and application thereof
  • Lithium-ion battery separator, and preparation method and application thereof
  • Lithium-ion battery separator, and preparation method and application thereof

Examples

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preparation example Construction

[0061] In the present invention, the method of compounding the water-based functional layer on the surface of the diaphragm substrate may be a coating method, or other methods capable of forming a coating. Specifically, an embodiment of the present invention provides a method for preparing a lithium-ion battery separator, comprising the following steps:

[0062] Coating the inorganic nano-ceramic slurry and the water-based functional binder slurry on one or both sides of the separator substrate respectively, and drying to form an inorganic nano-ceramic layer and a water-based functional binder layer respectively to obtain a lithium-ion battery separator; the water-based The functional binder slurry includes a water-based functional binder and water;

[0063] Alternatively, the mixed slurry is coated on one or both sides of the separator substrate, and dried to form a mixed material layer to obtain a lithium ion battery separator; the mixed slurry includes inorganic nano-cerami...

Embodiment 1

[0102] In terms of mass fraction, 10% of alumina nano-ceramic powder, 30% of water-based functional binder AFL (Japan ZEON company, model BM-2509), 1% of acrylate and 59% of water were mixed in a 25m The line speed of / s disperses evenly at high speed to obtain a mixed slurry;

[0103] The mixed slurry was coated on one side of the separator substrate by a gravure printing process, and baked at a temperature of 90° C. to obtain a lithium-ion battery separator with a coating thickness of 3 μm.

[0104] Carry out scanning electron microscope analysis (SEM) to described coating, its scanning electron microscope picture is as follows image 3 as shown, image 3 SEM photo of the membrane surface coating provided in Example 1.

Embodiment 2

[0106] In terms of mass fraction, 50% magnesium hydroxide nano-ceramic powder, 5% PMMA (Chengdu Yindile Company, model LA133), 10% acrylic ester and 35% water were mixed, and a 25m / s line The speed is high and the dispersion is uniform, and the mixed slurry is obtained;

[0107] The mixed slurry was coated on both sides of the separator substrate by a gravure printing process, and baked at a temperature of 60° C. to obtain a lithium-ion battery separator with a coating thickness of 3 μm.

[0108] Carry out scanning electron microscope analysis (SEM) to described coating, its scanning electron microscope picture is as follows Figure 4 as shown, Figure 4 SEM photo of the membrane surface coating provided for Example 2.

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Abstract

The invention provides a lithium-ion battery separator, and a preparation method and application thereof. The lithium-ion battery separator comprises a separator substrate and an aqueous function layer composited on the surface of the separator substrate. The aqueous function layer is equipped with multiple micropores. The aqueous function layer has viscidity. When the separator provided by the embodiment of the invention is applied to a polymer lithium-ion battery, a partial lithium separation phenomenon will not occurs in a cycle process and deformation or a relatively high expansion phenomenon will not occur in a battery pole group, thereby facilitating stability of cycle life. Moreover, the heat contractility of the separator is improved. The separator and an electrode are adhered together well with the combination of effects such as the viscidity of the aqueous function layer. In a safety test process or when the battery is abused such as the fact that the battery is punctured, extruded, twisted and bended, or when the battery is used in a high temperature environment for a long time, the safety performance of the battery can be greatly improved.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a separator for lithium ion batteries, a preparation method and application thereof. Background technique [0002] Due to a series of advantages such as high energy density, long cycle life and high open circuit voltage, lithium-ion batteries have attracted more and more attention. According to the different electrolyte materials used in lithium-ion batteries, lithium-ion batteries are divided into liquid lithium-ion batteries (Liquified Lithium-Ion Battery, referred to as LIB) and polymer lithium-ion batteries (PolymerLithium-Ion Battery, referred to as PLB). The positive and negative electrode materials used in polymer lithium-ion batteries are the same as those in liquid lithium-ion batteries, and the working principle of the batteries is basically the same. Their main difference lies in the different electrolytes. Liquid lithium-ion batteries use liquid electro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M2/14H01M10/0525H01M10/0587
CPCH01M10/0525H01M10/0587H01M50/431H01M50/403H01M50/411Y02E60/10Y02P70/50
Inventor 邹啸天黄保宁罗炳财
Owner LENOVO (BEIJING) CO LTD
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