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Preparation process of composite diaphragm

A composite diaphragm and preparation technology, which is applied to electrical components, electrochemical generators, circuits, etc., can solve the problems of uneven coating thickness, low overall porosity of the diaphragm, and poor coating quality, so as to achieve low cost and high performance. Safety performance and cycle performance, and the effect of good consistency

Active Publication Date: 2018-02-16
JIANGSU ZENIO NEW ENERGY BATTERY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The purpose of the present invention is to provide a composite diaphragm preparation process to ensure the coating thickness of the composite diaphragm in view of the shortcomings of the existing diaphragm coating process, such as uneven coating thickness, poor coating quality, and low overall porosity of the diaphragm. Uniformity and stability, thereby improving the safety performance and cycle performance of the battery

Method used

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  • Preparation process of composite diaphragm

Examples

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Embodiment 1

[0030] Such as figure 1 Shown, a kind of preparation technology of composite diaphragm, it comprises the following steps:

[0031] Step 1), coating slurry 3 is formed by mixing PVDF, water and sodium carboxymethyl cellulose in a mass ratio of 40:50:10, and coating slurry 3 is passed into coating tank 1 through feed port 2, and coating The top of the groove 1 is provided with a micro-groove roller 4 with a micro-groove 5 on the surface, and the next week of the micro-groove roller 4 is immersed in the paint tank 1, and the part of the micro-groove roller 4 immersed in the paint tank 1 part and not immersed in the paint tank 1 part The end-to-face ratio is 1:2; the base film 6 is driven above the dimple roller 4, and the distance between the dimple roll 4 and the base film 6 is controlled at 5mm;

[0032] Step 2), make the base film 6 move at a constant speed under the drive of the guide roller 7, and control the tension of the diaphragm directly above the coating tank 1 at 10N...

Embodiment 2

[0036] A kind of preparation technology of composite membrane, it comprises the following steps:

[0037] Step 1), coating slurry 3 is formed by mixing PVDF, water and styrene-butadiene rubber in a mass ratio of 40:50:10, and coating slurry 3 is passed into coating tank 1 through feed port 2, and coating tank 1 The top is provided with a micro-groove roller 4 with micro-grooves 5 on the surface, and the next week of the micro-groove roller 4 is immersed in the paint tank 1, and the ratio of the end surface of the micro-groove roller 4 immersed in the paint tank 1 part and not immersed in the paint tank 1 part is 1:4; a base film 6 is driven above the dimple roller 4, and the distance between the dimple roller 4 and the base film 6 is controlled at 10mm;

[0038] Step 2), make the base film 6 move at a constant speed under the drive of the guide roller 7, and control the tension of the diaphragm directly above the coating tank 1 at 25N;

[0039] Step 3), rotating the dimpled r...

Embodiment 3

[0042] A kind of preparation technology of composite membrane, it comprises the following steps:

[0043]Step 1), the coating slurry 3 is formed by mixing aluminum oxide, water and polyacrylic acid in a mass ratio of 40:50:10, and the coating slurry 3 is passed into the coating tank 1 through the feed port 2, and the coating tank The top of 1 is provided with a micro-groove roller 4 with micro-grooves 5 on the surface, and the lower circumference of the micro-groove roller 4 is immersed in the paint tank 1, and the end surface of the micro-groove roller 4 immersed in the part of the paint tank 1 and not immersed in the part of the paint tank 1 The ratio is 1:3; the base film 6 is driven above the dimple roller 4, and the distance between the dimple roll 4 and the base film 6 is controlled at 25mm;

[0044] Step 2), make the base film 6 move at a constant speed under the drive of the guide roller 7, and control the tension of the diaphragm directly above the coating tank 1 at 3...

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Abstract

The invention belongs to the technical field of a lithium ion battery diaphragm, and particularly relates to a preparation process of a composite diaphragm. The preparation process comprises the following steps of 1) pumping to-be-coated paste into a coating groove through a material inlet, wherein a micro concave roller is arranged at the top end of the coating groove, a base membrane is arrangedabove the micro concave roller in a transmission manner, and a certain spacing is kept between the micro concave roller and the base membrane; 2) enabling the base membrane to perform a uniform motion under the driving of a guiding roller, and controlling the tension of the diaphragm just above the coating groove to be 5-35N; and 3) rotating the micro concave roller to drive the material, and enabling the rotary direction of the micro concave roller to be opposite to the motion direction of the base membrane, enabling the paste to be sputtered and coated on the base membrane through the rotary micro concave roller, and then performing drying to obtain the composite diaphragm. In the coating process, the micro concave roller and the base membrane are not in direct contact, and the rotationof the micro concave roller drives the coating paste to be sputtered and coated; then the base membrane in reverse motion takes away the coating liquid, thereby realizing uniform coating of the composite coating layer; and the obtained composite diaphragm is high in heat resistance, high in porosity, uniform in coating layer thickness and excellent in consistency.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery diaphragms, and in particular relates to a preparation process of a lithium-ion battery composite diaphragm. Background technique [0002] Due to the characteristics of high energy density, high working voltage and light weight, lithium-ion secondary batteries have been widely used in consumer electronics products, such as mobile phones, notebook computers, tablet computers, Bluetooth headsets, MP3, digital cameras and other fields. With the increasingly serious problems of environmental pollution and energy crisis, the use of lithium-ion secondary batteries in the fields of power batteries and energy storage power stations is becoming more and more popular, but the safety of lithium-ion secondary batteries has always been the focus of attention . [0003] The diaphragm of the lithium-ion secondary battery is used as the isolation of the positive and negative electrodes, and is sandwi...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M2/14H01M10/0525H01M50/403H01M50/411H01M50/434H01M50/443H01M50/489H01M50/491
CPCH01M10/0525H01M50/403H01M50/431Y02E60/10
Inventor 黎旭均姜斌
Owner JIANGSU ZENIO NEW ENERGY BATTERY TECH CO LTD