Dry unilateral-stretching production technology of lithium battery separator

A lithium battery separator and production process technology, which is applied in the field of dry single-drawing production process of lithium battery separator, can solve problems such as uneven pore size distribution of lithium battery separator, and achieve regular lamellar structure, crystallinity and tensile strength improvement , Improve the effect of orientation degree and crystallization behavior

Inactive Publication Date: 2020-07-10
石狮申泰新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Therefore, in view of the above content, the present invention provides a dry single-drawing production process of lithium battery separators to solve the problem of uneven pore size distribution of lithium battery separators produced in the prior art

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A dry-process single-drawing production process of a lithium battery diaphragm, comprising the following steps:

[0028] Step 1, material preparation: select polypropylene and ethylene-propylene copolymer as raw materials, pre-dry them respectively, then put them into a high-speed mixer, and stir until uniform, wherein the mass fraction of the ethylene-propylene copolymer is 0.8%, and the The mass fraction of the polypropylene is 99.2%, the polypropylene adopts isotactic polypropylene with an isotactic index ≥ 95%, and the melt flow rate is 1.2g / 10min;

[0029] Step 2. Melt extrusion: put the uniformly mixed raw materials into the extruder, plasticize into a uniform melt and extrude from the slit die. The extrusion temperatures in each section of the extruder are 155°C, 180°C, 195°C, 210°C, the die temperature is 195°C;

[0030] Step 3, cast film forming: the melt obtained in step 2 is cast to form a polypropylene base film, and the melt is drawn during the process of ...

Embodiment 2

[0035] A dry-process single-drawing production process of a lithium battery diaphragm, comprising the following steps:

[0036] Step 1, material preparation: select polypropylene and ethylene-propylene copolymer as raw materials, pre-dry them respectively, then put them into a high-speed mixer, and stir until uniform, wherein the mass fraction of the ethylene-propylene copolymer is 2%, and the The mass fraction of the polypropylene is 98%, the polypropylene adopts isotactic polypropylene with an isotactic index ≥ 95%, and the melt flow rate is 1.8g / 10min;

[0037] Step 2. Melt extrusion: Put the uniformly mixed raw materials into the extruder, plasticize into a uniform melt and extrude from the slit die. The extrusion temperatures in each section of the extruder are 160°C, 185°C, 200°C, 215°C, the die temperature is 200°C;

[0038] Step 3, cast film forming: the melt obtained in step 2 is cast to form a polypropylene base film, and the melt is drawn during the process of form...

Embodiment 3

[0043] A dry-process single-drawing production process of a lithium battery diaphragm, comprising the following steps:

[0044] Step 1, material preparation: select polypropylene and ethylene-propylene copolymer as raw materials, pre-dry them respectively, then put them into a high-speed mixer, and stir until uniform, wherein the mass fraction of the ethylene-propylene copolymer is 3.5%, and the The mass fraction of the polypropylene is 96.5%, the polypropylene adopts isotactic polypropylene with an isotactic index ≥ 95%, and the melt flow rate is 5g / 10min;

[0045] Step 2. Melt extrusion: put the uniformly mixed raw materials into the extruder, plasticize into a uniform melt and extrude from the slit die. The extrusion temperatures in each section of the extruder are 165°C, 190°C, 210°C, 220°C, the die temperature is 205°C;

[0046] Step 3, cast film forming: the melt obtained in step 2 is cast to form a polypropylene base film, and the melt is drawn during the process of fo...

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Abstract

The invention relates to the technical field of lithium battery separators and provides a dry unilateral-stretching production technology of a lithium battery separator. The dry unilateral-stretchingproduction technology of the lithium battery separator solves the problem that the hole size distribution of a lithium battery separator produced in the prior art is uneven. The dry method unilateralstretching production technology of the lithium battery separator comprises the following steps of (1) preparing materials, wherein polypropylene and ethylene-propylene copolymer are used as raw materials, pre-dried respectively and then put into a high-speed mixer to be stirred to uniform; (2) conducting melt extrusion, wherein the evenly mixed raw materials are fed into an extrusion machine andplastified into uniform melt, and the uniform melt is extruded from a slit die; (3) conducting tape casting film formation, wherein the melt undergoes tape casting and then forms a polypropylene basefilm, and the polypropylene base film undergoes traction and coiling; (4) conducting annealing treatment, wherein the coiled polypropylene base film is placed in a drying box to undergo annealing treatment; (5) conducting unilateral stretching, wherein the annealed polypropylene base film undergoes cold stretching and hot stretching; and (6) conducting heat setting, wherein heat setting is conducted on the polypropylene base film completing unilateral stretching, and after cooling and coiling, the lithium battery separator is obtained.

Description

technical field [0001] The invention relates to the technical field of lithium battery diaphragms, in particular to a dry-process single-drawing production process for lithium battery diaphragms. Background technique [0002] The lithium battery separator is an important part of the lithium battery, which plays the role of separating the positive and negative electrodes, preventing the internal short circuit of the battery, allowing the electrolyte ions to pass freely, and completing the electrochemical charge and discharge process. Its performance determines the interface structure and internal resistance of the battery, which directly affects the capacity, cycle performance and safety performance of the battery. A separator with excellent performance plays an important role in improving the overall performance of the battery. [0003] At present, the preparation process of lithium battery separator is divided into three categories: dry uniaxial stretching, dry biaxial stre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C48/08B29C48/00B29C48/92B29C71/02C08L23/12C08L23/16C08J5/18H01M2/14H01M2/16
CPCB29C71/02B29C48/0011B29C48/0018B29C48/08B29C48/92B29C2948/92704B29C2948/92904C08J5/18C08J2323/12C08J2423/14H01M50/403H01M50/411Y02E60/10
Inventor 俞晓
Owner 石狮申泰新材料科技有限公司
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