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

A kind of preparation method of lithium-ion battery diaphragm material

A technology for lithium ion batteries and separator materials, applied in the field of lithium ion battery separator materials and their preparation, can solve the problems of poor gas permeability and lyophilicity of the separator, melting, contact between positive and negative electrodes, thermal runaway, etc. Effects of degradability, crystallinity reduction, high water holding capacity

Active Publication Date: 2019-04-19
合肥国轩精密涂布材料有限责任公司
View PDF6 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to different structures and compositions, lithium-ion battery separator materials mainly include: polyolefin film, non-woven fabric, polymer / inorganic composite separator, etc. Commercial lithium-ion battery separators are mainly polyethylene (PE), polypropylene (PP) ) microporous membrane and polypropylene / polyethylene / polypropylene (PP / PE / PP) three-layer separator, but the air permeability and lyophilicity of this kind of separator are poor, and the material is easily deformed at high temperature. When the heat reaches 170°C, the diaphragm will melt rapidly, making the positive and negative electrodes contact, and thermal runaway behavior will occur

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-ion battery diaphragm material
  • A kind of preparation method of lithium-ion battery diaphragm material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Embodiment 1: a kind of lithium-ion battery separator material of the present invention and preparation method thereof, comprises the following steps:

[0022] Step 1: Dissolution of bacterial cellulose: Take 3g of pretreated bacterial cellulose powder, evenly disperse it into 100ml of 8% LiCl / DMAC solution, heat and stir at 100°C for 4h, then continue to stir at room temperature for a certain period of time until dissolved. Centrifugal defoaming to obtain light yellow transparent bacterial cellulose solution.

[0023] Step 2: Preparation of bacterial cellulose film: Take the bacterial cellulose solution in the first step and pour it evenly on a smooth glass plate, start the flat-type film scraping machine, adjust the thickness of the scraping film to 40 μm, and the scraping rate to 1.0 m min -1 , scraping the film on a flat plate, then standing in the air for 10 minutes, phase transfer in water for 1 hour, washing with deionized water, and drying to obtain a bacterial ...

Embodiment 2

[0027] Embodiment 2: a kind of lithium-ion battery separator material of the present invention and preparation method thereof, comprises the following steps:

[0028] Step 1: Dissolution of bacterial cellulose: Take 3g of pretreated bacterial cellulose powder, evenly disperse it into 100ml of 8% LiCl / DMAC solution, heat and stir at 80°C for 5h, then continue to stir at room temperature for a certain period of time until dissolved. Centrifugal defoaming to obtain light yellow transparent bacterial cellulose solution.

[0029] Step 2: Preparation of bacterial cellulose film: Take the bacterial cellulose solution in the first step and pour it evenly on a smooth glass plate, start the flat-plate scraping machine, adjust the thickness of the scraping film to 40 μm, and the scraping rate to 0.5m.min -1 , scraping the film on a flat plate, then standing in the air for 10 minutes, phase transfer in water for 2 hours, washing with deionized water, and drying to obtain a bacterial cellu...

Embodiment 3

[0032] Embodiment 3: a kind of lithium-ion battery separator material of the present invention and preparation method thereof, comprises the following steps:

[0033] Step 1: Dissolution of bacterial cellulose: Take 3g of pretreated bacterial cellulose powder and evenly disperse it into 100ml of 8% LiCl / DMAC solution, heat and stir at 120°C for 3h, then continue to stir at room temperature for a certain period of time until dissolved. Centrifugal defoaming to obtain light yellow transparent bacterial cellulose solution.

[0034] Step 2: Preparation of bacterial cellulose film: Take the bacterial cellulose solution in the first step and pour it evenly on a smooth glass plate, start the flat-plate scraping machine, adjust the thickness of the scraping film to 35 μm, and the scraping rate to 0.5 m min -1 , scraping the film on a flat plate, then standing in the air for 20 minutes, phase transfer in water for 1 hour, washing with deionized water, and drying to obtain a bacterial c...

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
thicknessaaaaaaaaaa
thicknessaaaaaaaaaa
decomposition temperatureaaaaaaaaaa
Login to View More

Abstract

The invention discloses a preparation method of a lithium-ion battery diaphragm material. The material is prepared by the following steps: dissolving bacterial cellulose in different system solvents, adopting a flat-plate scraping film method to form a film, and then coating with dissolved PVDF glue, After phase transfer, a PVDF / BCM / PVDF three-layer lithium-ion battery adhesive separator is obtained. The obvious advantage of the invention is that the bacteria cellulose membrane is used as the separator material of the lithium ion battery. Bacterial cellulose membrane has a fine three-dimensional network structure, high water holding capacity, high Young's modulus and porosity, good thermal stability, dimensional stability and biodegradability. The film is made by flat plate scraping film, the film thickness is easy to control, the porosity is high, the operation is simple, and the cost is low. Using PVDF to construct PVDF / BCM / PVDF three-layer lithium-ion battery adhesive separator to enhance the electrochemical performance of lithium-ion batteries.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a lithium ion battery diaphragm material and a preparation method thereof. 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....

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): H01M2/14H01M2/16H01M10/0525H01M50/403H01M50/417H01M50/44H01M50/454H01M50/457H01M50/491
CPCH01M10/0525H01M50/40H01M50/409H01M50/403H01M50/411H01M50/44H01M50/449Y02E60/10
Inventor 代北北张江伟陈兵
Owner 合肥国轩精密涂布材料有限责任公司