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

A kind of preparation method of lithium battery separator

A lithium battery separator and diaphragm technology, which is applied in the field of preparation of lithium battery separators, can solve problems such as poor thermal stability and environmental pollution, and achieve the effects of high production efficiency, reduced production costs, and simple preparation methods

Active Publication Date: 2022-08-05
中材锂膜(常德)有限公司
View PDF8 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a preparation method of a lithium battery diaphragm, to solve the technical problems of the compatibility between the diaphragm and the liquid electrolyte, the poor thermal stability at high temperature and the preparation process will pollute the environment in the prior art

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 kind of preparation method of lithium battery separator
  • A kind of preparation method of lithium battery separator

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The preparation method of the lithium battery separator of the present embodiment includes the following steps:

[0022] (1) Add the organic polymer base material into the organic solvent, the organic polymer base material is polyolefin, and then stir to fully mix the organic polymer base material in the organic solvent to obtain the first colloidal solution; the polyolefin used in this step It is polyethylene (PE), and the organic solvent adopts a mixture of polyvinylidene fluoride and N-methylpyrrolidone with a weight ratio of 1:1. In the first colloidal solution, the weight ratio of polyethylene accounts for 80%, and the weight ratio of organic solvent accounts for 20%.

[0023] (2) Add the inorganic material into the first colloidal solution, mix and stir evenly, the stirring time is 0.5h, the stirring temperature is 80°C, and the mixture is obtained by ball milling in a ball mill. The ball milling speed is 3000r / min, and the ball milling time is 20min. A mixture o...

Embodiment 2

[0030] The preparation method of the lithium battery separator of the present embodiment includes the following steps:

[0031] (1) Add the organic polymer base material into the organic solvent, the organic polymer base material is polyolefin, and then stir to fully mix the organic polymer base material in the organic solvent to obtain the first colloidal solution; the polyolefin used in this step For polypropylene, the organic solvent adopts a mixture of polyvinylidene fluoride and N-methylpyrrolidone with a weight ratio of 0.4:0.6. In the first colloidal solution, the weight ratio of polypropylene accounts for 90%, and the weight ratio of organic solvent accounts for 10%.

[0032] (2) Add the inorganic material into the first colloidal solution, mix and stir evenly, the stirring time is 1 h, the stirring temperature is 20 ℃, and the mixture is obtained by ball milling in a ball mill. A mixture of aluminum oxide, aluminum nitride, and aluminum silicate, the mass ratio of alu...

Embodiment 3

[0039] The preparation method of the lithium battery separator of the present embodiment includes the following steps:

[0040] (1) Add the organic polymer base material into the organic solvent, the organic polymer base material is polyolefin, and then stir to fully mix the organic polymer base material in the organic solvent to obtain a first colloidal solution; the polyolefin used in this step For polyimide, the organic solvent adopts a mixture of polyvinylidene fluoride and N-methylpyrrolidone with a weight ratio of 0.6:0.4. In the first colloidal solution, the weight ratio of polyimide accounts for 70%, and the weight ratio of organic solvent accounts for 70%. 30%.

[0041] (2) Add the inorganic material into the first colloidal solution, mix and stir evenly, the stirring time is 1 h, the stirring temperature is 80 °C, and the mixture is obtained by ball milling in a ball mill. The mixture of aluminum silicate and sodium silicate, the mass ratio of aluminum silicate and ...

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

PropertyMeasurementUnit
particle diameteraaaaaaaaaa
thicknessaaaaaaaaaa
particle diameteraaaaaaaaaa
Login to View More

Abstract

The invention discloses a preparation method of a lithium battery separator, comprising the following steps: (1) adding an organic polymer base material into an organic solvent, wherein the organic polymer base material is polyolefin, and stirring to fully mix the organic polymer base material in an organic solvent In the organic solvent, the first colloidal solution is obtained; (2) the inorganic material is added to the first colloidal solution, and the inorganic material adopts one or two of alumina, aluminum nitride, aluminum silicate, sodium silicate or boehmite; (3) heating the mixture to form a fluid state, casting and casting it onto a stainless steel substrate and cooling to form a membrane; (4) heat-treating the membrane; (5) heat-treating the membrane The resulting membrane is stretched longitudinally and transversely. During the stretching process, the organic polymer and the inorganic material are partially broken to form a microporous structure; (6) The stretched membrane in the previous step is heat-set and processed. Cooling to obtain the desired lithium battery separator.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a preparation method of a lithium battery separator. Background technique [0002] Lithium batteries are considered as the most potential energy storage devices due to their high energy density and safe and reliable rapid charge and discharge, and are widely used in 3C electronic products, electric vehicles, hybrid vehicles, etc. However, there are also potential dangers in the application of lithium batteries. The frequent combustion and explosion accidents of lithium batteries have brought huge threats to people's lives and property safety. Lithium batteries are composed of a positive electrode, a negative electrode, a separator and an electrolyte. On the premise that the positive and negative electrode materials have not been greatly improved, the separator has been widely studied as a key material affecting the performance of the battery. [0003] At present, lithi...

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
Patent Type & Authority Patents(China)
IPC IPC(8): H01M50/403H01M50/446H01M10/052H01M10/42
CPCH01M50/403H01M50/446H01M10/052H01M10/4235Y02E60/10
Inventor 房坦陈立新邱兴富朱泳钱郭超
Owner 中材锂膜(常德)有限公司