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

A battery separator and a preparation method thereof

A battery diaphragm and resin technology, applied in the field of battery diaphragm and its preparation, can solve the problems that polyolefin diaphragm cannot meet the use requirements, affect the battery cycle life, and poor wettability of electrolyte, etc., and achieve increased cycle performance, better wettability, The effect of high ionic conductivity

Active Publication Date: 2018-12-28
HEBEI GELLEC NEW ENERGY MATERIAL SCI&TECHNOLOY CO LTD
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Due to the lyophobic surface and low surface energy of the polyolefin material itself, this type of separator has poor wettability to the electrolyte, which affects the cycle life of the battery.
[0005] In addition, because the heat distortion temperature of PE and PP is relatively low, the diaphragm will suffer severe heat shrinkage when the temperature is too high, so this type of diaphragm is not suitable for use in high temperature environments, making traditional polyolefin diaphragms unable to meet the requirements of today's 3C products and power batteries. requirements for use

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
  • A battery separator and a preparation method thereof
  • A battery separator and a preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0047] The preparation method of the described battery diaphragm comprises the following steps:

[0048] The slurry prepared from the raw materials is made into fibers, and the fibers are bonded to obtain a battery separator.

[0049] Preferably, the preparation method of the battery separator specifically includes the following steps:

[0050] (a) mixing and dispersing the inorganic powder and the dispersing agent in proportion completely to obtain the mixed slurry A;

[0051] (b) mixing the resin co-solvent and the organic solvent uniformly in proportion, and then adding the resin to obtain the mixed slurry B;

[0052] (c) mixing the mixed slurry A and the mixed slurry B obtained in step (a) and step (b) uniformly to obtain finished slurry C;

[0053] (d) Prepare the finished slurry C into fibers by electrospinning technology, and bond the fibers to obtain a battery separator.

[0054] Preferably, the steps (a) and (b) are in no sequence.

[0055] Preferably, in step (d), ...

Embodiment 1

[0059] The preparation method of the battery diaphragm provided by the application specifically includes the following steps:

[0060] (a) 1 part of boehmite and 5 parts of dispersant are mixed and dispersed completely in proportion to obtain mixed slurry A;

[0061] (b) 2 parts of CaCl 2 Mix evenly with 45 parts of acetone in proportion, then add 10 parts of aromatic polyamide to obtain mixed slurry B;

[0062] (c) mixing the mixed slurry A and the mixed slurry B obtained in step (a) and step (b) uniformly to obtain finished slurry C;

[0063] (d) Electrospinning technology is used to make the finished slurry C. Under the action of a strong electric field, the droplet at the needle will change from a spherical shape to a conical shape, and extend from the tip of the cone to obtain fiber filaments. The jet flow can Running for a considerable distance, it finally solidifies into fibers, which are bonded to obtain a battery separator.

Embodiment 2

[0065] The preparation method of the battery diaphragm provided by the application specifically includes the following steps:

[0066] (a) 20 parts of alumina and 20 parts of dispersant are mixed and dispersed completely in proportion to obtain mixed slurry A;

[0067] (b) 10 parts of LiCl and 60 parts of N-methylpyrrolidone were uniformly mixed in proportion, and then 20 parts of aromatic polyamide were added to obtain mixed slurry B;

[0068] (c) mixing the mixed slurry A and the mixed slurry B obtained in step (a) and step (b) uniformly to obtain finished slurry C;

[0069] (d) Electrospinning technology is used to make the finished slurry C. Under the action of a strong electric field, the droplet at the needle will change from a spherical shape to a conical shape, and extend from the tip of the cone to obtain fiber filaments. The jet flow can Running for a considerable distance, it finally solidifies into fibers, which are bonded to obtain a battery separator.

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 provides a battery separator and a preparation method thereof, which is prepared from the following components in parts by weight: resin 10-20 parts, organic solvent 40-60 parts, resin cosolvent 2-10 parts, dispersant 5-20 part and inorganic powder 1-20 parats. The battery separator provided by the present invention takes a resin as a matrix, uniformly disperses inorganic powder, hasthe advantages of better wettability, high ionic conductivity and the like, and has enhanced thermal stability as well as improved safety performance. The battery separator provided by the present application improves the battery cycle performance and prolongs the battery life after use.

Description

technical field [0001] The invention relates to the technical field of battery separator materials, in particular to a battery separator and a preparation method thereof. Background technique [0002] In the prior art, battery separators are mainly microporous polyolefin separators based on polyethylene (PE) and polypropylene (PP). This type of separator relies on low cost, good mechanical properties, and excellent chemical stability. It has been widely used in battery separators due to its advantages of electrochemical stability and so on. [0003] Practical applications include single-layer PP or PE diaphragms, double-layer PE / PP composite diaphragms, double-layer PP / PP composite diaphragms, and three-layer PP / PE / PP composite diaphragms. [0004] Due to the lyophobic surface and low surface energy of the polyolefin material itself, this type of separator has poor wettability to the electrolyte, which affects the cycle life of the battery. [0005] In addition, because th...

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): H01M2/14H01M2/16H01M50/403H01M50/423H01M50/44H01M50/446H01M50/489H01M50/497
CPCH01M50/411H01M50/44H01M50/431H01M50/403Y02E60/10
Inventor 徐锋袁海朝王晓静苏碧海
Owner HEBEI GELLEC NEW ENERGY MATERIAL SCI&TECHNOLOY CO LTD