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Preparation method of organic-inorganic lithium ion battery diaphragm

An ion battery, inorganic lithium technology, applied in secondary batteries, battery pack components, circuits, etc., can solve problems such as performance defects, low safety performance and rate performance, and inability to meet the requirements of lithium ion batteries, and achieve improved durability. The effect of temperature performance, improving safety performance and rate performance

Inactive Publication Date: 2019-10-25
高芳
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, commercial polyolefin separators or conventional ceramic coating separators have performance defects, low safety performance and rate performance, which cannot meet the requirements of lithium-ion batteries.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A preparation method of an organic-inorganic lithium-ion battery diaphragm, comprising the following steps:

[0028] Step 1, raw material preparation, polymer polyethylene solid raw material, pore forming agent, antioxidant, paraffin oil;

[0029] Step 2, high-temperature melting, mixing high-molecular polyethylene solid raw materials with pore-forming agent antioxidants, paraffin oil and other raw materials according to the process ratio, heat-melting at high temperature into a fluid state, and stirring and extruding through a screw extruder.

[0030] Step 3: Squeeze casting. The fluid polyethylene is transported to a special film mold through a screw extruder, and the fluid polyethylene is extruded from the mold by high pressure, and cooled by a special guide roller to form a film.

[0031] Step 4. Longitudinal stretching, uniformly stretching the composite of polyethylene and pore-forming agent cooled to form a film in the longitudinal direction, so that its thicknes...

Embodiment 2

[0044] A preparation method of an organic-inorganic lithium-ion battery diaphragm, comprising the following steps:

[0045] Step 1, raw material preparation, polymer polyethylene solid raw material, pore forming agent, antioxidant, paraffin oil;

[0046] Step 2, high-temperature melting, mixing high-molecular polyethylene solid raw materials with pore-forming agent antioxidants, paraffin oil and other raw materials according to the process ratio, heat-melting at high temperature into a fluid state, and stirring and extruding through a screw extruder.

[0047] Step 3: Squeeze casting. The fluid polyethylene is transported to a special film mold through a screw extruder, and the fluid polyethylene is extruded from the mold by high pressure, and cooled by a special guide roller to form a film.

[0048] Step 4. Longitudinal stretching, uniformly stretching the composite of polyethylene and pore-forming agent cooled to form a film in the longitudinal direction, so that its thicknes...

Embodiment 3

[0061]A preparation method of an organic-inorganic lithium-ion battery diaphragm, comprising the following steps:

[0062] Step 1, raw material preparation, polymer polyethylene solid raw material, pore forming agent, antioxidant, paraffin oil;

[0063] Step 2, high-temperature melting, mixing high-molecular polyethylene solid raw materials with pore-forming agent antioxidants, paraffin oil and other raw materials according to the process ratio, heat-melting at high temperature into a fluid state, and stirring and extruding through a screw extruder.

[0064] Step 3: Squeeze casting. The fluid polyethylene is transported to a special film mold through a screw extruder, and the fluid polyethylene is extruded from the mold by high pressure, and cooled by a special guide roller to form a film.

[0065] Step 4. Longitudinal stretching, uniformly stretching the composite of polyethylene and pore-forming agent cooled to form a film in the longitudinal direction, so that its thickness...

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PUM

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Abstract

The invention discloses a preparation method of an organic-inorganic lithium ion battery diaphragm, and belongs to the technical field of lithium batteries. The method comprises the following steps: polymer raw material preparation, high-temperature melting, extrusion casting, longitudinal and transverse stretching extraction pore-forming, heat setting, ceramic slurry coating, heat setting, cutting, rolling and inspection. Organic clay minerals and inorganic ceramic oxide are combined to form the organic-inorganic lithium ion battery diaphragm. The performance defects of commercial polyolefindiaphragms or conventional ceramic coating diaphragms are effectively overcome; on one hand, the temperature resistance of the lithium battery is improved; on the other hand, the electrochemical performance of the lithium ion power battery is improved in the aspects of resisting large-current charging and discharging, and an interface between an electrode and an electrolyte and the like are reduced, so that the safety performance and the rate capability of the lithium ion power battery are improved.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, and relates to a preparation method of an organic-inorganic lithium ion battery diaphragm. Background technique [0002] The separator is a critical inner layer component in lithium-ion batteries. Key properties such as battery capacity, cycle performance, charge and discharge current density, high temperature resistance, high strength, and safety guarantee are directly related to the separator. [0003] With the promotion of ternary batteries, mastering ceramic slurry preparation technology and diaphragm coating technology plays an important role in improving the overall competitiveness of self-developed lithium-ion batteries and improving the industrial chain structure. The ceramic diaphragm currently used in the market is alumina attached to the base film to enhance the high temperature resistance of the base film. However, commercial polyolefin separators or conventional ceramic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M10/0525
CPCH01M10/0525H01M50/403H01M50/446Y02E60/10
Inventor 高保清舒均国陈立新高芳
Owner 高芳
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