Ceramic diaphragm with good bonding property, preparation method thereof and lithium ion battery containing ceramic diaphragm

A ceramic diaphragm and combined technology, which is applied in the direction of secondary batteries, battery pack components, circuits, etc., can solve the problems of high energy consumption cost of ceramic diaphragm drying, unfavorable battery cycle rate performance, and decreased heat resistance of ceramic diaphragms. Achieve the effects of reducing the difficulty of attachment, strong adhesion, and reducing polymerization energy

Pending Publication Date: 2020-06-05
SHENZHEN HONCELL ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, in this ceramic diaphragm, the glue mainly adopts adhesives such as LA133 or epoxy resin, and there are the following problems in actual use: 1. The bonding strength is low, and the prepared ceramic diaphragm loses powder during use, and a large amount of When the heat resistance of the ceramic diaphragm decreases and the internal resistance of the battery increases, it is not conducive to the cycle rate performance of the battery; 2. The prepared ceramic slurry has a high viscosity, and the solid content can only reach 25%, and the drying energy cost of the ceramic diaphragm is high. Production efficiency Low

Method used

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  • Ceramic diaphragm with good bonding property, preparation method thereof and lithium ion battery containing ceramic diaphragm
  • Ceramic diaphragm with good bonding property, preparation method thereof and lithium ion battery containing ceramic diaphragm
  • Ceramic diaphragm with good bonding property, preparation method thereof and lithium ion battery containing ceramic diaphragm

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Effect test

preparation example Construction

[0047] (2) Preparation of the first water-based slurry: Add ceramic powder, graphene, water-based polyurethane-acrylic resin emulsion, sodium m-carboxybenzenesulfonate, and silane coupling agent to one of the aqueous solutions prepared in step (1). Prepared into the first aqueous slurry;

[0048] (3) Preparation of the second water-based slurry: Add ceramic powder, water-based polyurethane-acrylic resin emulsion, sodium m-carboxybenzenesulfonate, and a silane coupling agent to another group of aqueous solutions prepared in step (1). The second aqueous slurry;

[0049] (4) Preparation of ceramic diaphragm: using a conventional diaphragm as a substrate, apply the first aqueous slurry obtained in step (2) on the diaphragm to form the first aqueous slurry coating, and then coat the first aqueous slurry after drying. The coating is coated with the second water-based slurry to form the second water-based slurry coating, so that a ceramic diaphragm with good adhesion can be obtained...

Embodiment 1

[0058] The preparation method of the good ceramic diaphragm of the present invention comprises the following steps:

[0059] (1) Preparation of aqueous solution: prepare a 4% aqueous solution with thickener and deionized water, and divide the obtained aqueous solution into 2 groups for later use;

[0060] (2) Preparation of the first water-based slurry: Add ceramic powder, graphene, water-based polyurethane-acrylic resin emulsion, sodium m-carboxybenzenesulfonate, and silane coupling agent to one of the aqueous solutions prepared in step (1). Prepared into the first aqueous slurry;

[0061] (3) Preparation of the second water-based slurry: Add ceramic powder, water-based polyurethane-acrylic resin emulsion, sodium m-carboxybenzenesulfonate, and a silane coupling agent to another group of aqueous solutions prepared in step (1). The second aqueous slurry;

[0062] (4) Preparation of ceramic diaphragm: using a conventional diaphragm as a substrate, apply the first aqueous slurr...

Embodiment 2

[0068] The preparation method of the good ceramic diaphragm of the present invention comprises the following steps:

[0069] (1) Preparation of aqueous solution: prepare a 4% aqueous solution with thickener and deionized water, and divide the obtained aqueous solution into 2 groups for later use;

[0070] (2) Preparation of the first water-based slurry: Add ceramic powder, graphene, water-based polyurethane-acrylic resin emulsion, sodium m-carboxybenzenesulfonate, and silane coupling agent to one of the aqueous solutions prepared in step (1). Prepared into the first aqueous slurry;

[0071] (3) Preparation of the second water-based slurry: Add ceramic powder, water-based polyurethane-acrylic resin emulsion, sodium m-carboxybenzenesulfonate, and a silane coupling agent to another group of aqueous solutions prepared in step (1). The second aqueous slurry;

[0072] (4) Preparation of ceramic diaphragm: using a conventional diaphragm as a substrate, apply the first aqueous slurr...

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Abstract

The invention discloses a ceramic diaphragm. A diaphragm base material is coated with a first aqueous slurry coating, and the surface of the first aqueous slurry coating is coated with a second aqueous slurry coating. The thickness of the second aqueous slurry coating is greater than that of the first aqueous slurry coating. The compactness of the first aqueous slurry coating is greater than thatof the second aqueous slurry coating. The invention further discloses a lithium ion battery containing the ceramic diaphragm. The ceramic diaphragm disclosed by the invention has the characteristics of strong cohesiveness, good drying effect and excellent electrochemical performance.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a method for preparing a ceramic diaphragm node with good bonding properties and a lithium-ion battery containing the ceramic diaphragm. Background technique [0002] Due to the advantages of high energy density and long cycle life, lithium-ion batteries are widely used as energy storage materials in portable electronic devices, electric vehicles, and electronic storage systems. [0003] As an important component in the lithium-ion battery system, the separator plays an important role in the electrochemical performance and safety of the lithium battery. [0004] However, as the energy density of lithium-ion batteries continues to increase, the battery voltage continues to increase. The traditional polyolefin separator cannot meet the requirements of the existing high-voltage and high-safety lithium-ion batteries in terms of high-voltage resistance and high-temperatu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M10/0525
CPCH01M10/0525H01M50/403H01M50/446H01M50/449Y02E60/10
Inventor 肖利隆肖利敏肖文杰范海满王立福
Owner SHENZHEN HONCELL ENERGY CO LTD
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