Unlock instant, AI-driven research and patent intelligence for your innovation.

Preparation method of lithium ion battery diaphragm

A lithium-ion battery and separator technology, applied in secondary batteries, battery pack parts, separators/films/diaphragms/spacers, etc., can solve the problems of poor mechanical strength of separators, difficult control of pore size and porosity, and perforation of separators. and other problems to achieve the effect of ensuring pore size and porosity size, improving thermal stability and mechanical strength

Inactive Publication Date: 2016-11-16
HEFEI GUOXUAN HIGH TECH POWER ENERGY
View PDF8 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The dry stretching process is easy to operate and has no pollution. It is a common method for the preparation of lithium-ion battery separators, but it is difficult to control the pore size and porosity. At the same time, it is easy to cause perforation of the separator during stretching, and the mechanical strength of the separator is relatively poor.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Preparation method of lithium ion battery diaphragm

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Embodiment 1: the preparation method of a kind of lithium-ion battery separator of the present invention, comprises the following steps:

[0020] Step 1: Preparation of PVDF / cellulose blend solution: Take a certain amount of PVDF powder, add it to a certain amount of NMP solvent, and stir for 3 hours to obtain a PVDF solution with a mass fraction of 15%. The volume ratio is 1:0.5, and the cellulose solution with a mass fraction of 10% is slowly added to the prepared PVDF solution, and stirred evenly to obtain a uniform and stable PVDF / cellulose blend solution.

[0021] The second step: the preparation of spinning solution: take the PVDF / cellulose blend solution in the first step, add a certain amount of SiO 2 powder, stir evenly to get SiO 2 The mass fraction of 5% electrospinning solution.

[0022] Step 3: Preparation of spinning film: put the spinning solution obtained above into a syringe of a certain specification, adjust the temperature of the electrospinning dev...

Embodiment 2

[0024] Embodiment 2: the preparation method of a kind of lithium-ion battery separator of the present invention, comprises the following steps:

[0025] The first step: the same as the first step in embodiment 1.

[0026] The second step: the preparation of spinning solution: take the PVDF / cellulose blend solution of the first step, add a certain amount of Al 2 o 3 powder, stir evenly to get Al 2 o 3 The mass fraction of 5% electrospinning solution.

[0027] Step 3: Preparation of spinning film: put the spinning solution obtained above into a syringe of a certain specification, adjust the temperature of the electrospinning device to 25°C, the spinning voltage to 20KV, the spinning rate to 0.01ml / min, and the spinning distance 15㎝, the spinning time is 10h, and it is electrospun by static plate collection method, and the lithium-ion battery separator is obtained after post-processing.

[0028] The fourth step: the same as the fourth step of Example 1.

Embodiment 3

[0029] Embodiment 3: the preparation method of a kind of lithium-ion battery separator of the present invention, comprises the following steps:

[0030] The first step: the same as the first step in embodiment 1.

[0031] The second step: with the second step of embodiment 2.

[0032] Step 3: Preparation of spinning film: put the spinning solution obtained above into a syringe of a certain specification, adjust the temperature of the electrospinning device to 25°C, the spinning voltage to 20KV, the spinning rate to 0.01ml / min, and the spinning distance 15㎝, spinning time 10h, using a new drum as a receiving device for electrospinning, adjusting the speed of the longitudinal drum to 100rpm, and the horizontal drum to 30rpm, after post-processing to obtain a lithium-ion battery separator.

[0033] The fourth step: the same as the fourth step of Example 1.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a preparation method of a lithium ion battery diaphragm. The method includes the steps of adding PVDF powder to solvent to be stirred to obtain a PVDF solution, pouring a cellulose solution into the prepared PVDF solution to be evenly stirred to obtain a PVDF / cellulose blended solution, adding solid oxide powder to the PVDF / cellulose blended solution to be evenly stirred to obtain an electrostatic spinning solution, and conducting electrostatic spinning treatment on the obtained electrostatic spinning solution in an injector to obtain the lithium ion battery diaphragm. Compared with the prior art, the method has the advantages that the PVDF / cellulose blended solution obtained through the PVDF solution and one or more types of celluloses is adopted as an enhancing material, and the heat stability and mechanical strength of the diaphragm are improved; by means of an electrostatic spinning device and a setting and collecting mode of parameters including the temperature, humidity, field strength and extrusion rate of the electrostatic spinning device, the aperture and porosity size are ensured.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a method for producing and preparing lithium ion battery diaphragms. Background technique [0002] Lithium-ion batteries are widely used in large-scale application fields such as national defense industry, electric power industry, and space technology because of their advantages such as large specific energy, light weight, good cycle life, low self-discharge rate, no memory effect, and environmental friendliness. Lithium-ion batteries are mainly composed of positive and negative electrode materials, electrolyte, diaphragm, and shell. Diaphragm is an important part of lithium-ion batteries. The main function of lithium-ion battery diaphragms is to separate the positive and negative electrodes, prevent short-circuiting of the two poles, and at the same time make lithium ions Migrate between the positive and negative electrodes to complete the charge and discharge process. Comm...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): H01M2/14H01M2/16H01M10/0525H01M50/403H01M50/44
CPCH01M10/0525H01M50/44H01M50/40H01M50/403H01M50/409Y02E60/10
Inventor 代北北张江伟陈兵
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
PatSnap Eureka logo

PatSnap Eureka turns technology decisions into work you can execute. Powered by our Innovation Knowledge Graph, it runs expert workflows across engineering, life sciences, materials and intellectual property. Get your review-ready output in minutes.

X (Twitter)LinkedInYouTubeSubstack

© 2026 PatSnap. All rights reserved. 

Terms of Service

 | 

Privacy policy

 | 

Modern Slavery Act Transparency Statement