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Cooling roller device for preparing lithium-ion battery separator with three cellular structures

A lithium-ion battery, microporous structure technology, applied in secondary batteries, structural parts, battery pack parts, etc., can solve the problems of uneven distribution of micropores, easy outflow, and untimely cooling.

Active Publication Date: 2017-01-04
LIAOYUAN HONGTU LI ION BATTERY DIAPHRAGM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the existing polyolefin diaphragm preparation process, especially the wet process (TIPS), also known as phase separation method or thermally induced phase separation method, small molecules with high boiling point are added to polyolefin as porogens, and heated and melted to form a uniform system , and then phase separation occurs when the temperature is lowered. After biaxial stretching, organic solvents are used to extract small molecules, and interpenetrating microporous membrane materials can be prepared. In the melt extrusion stretching process, a single cooling roll is usually used, and the pore-forming agent is not completely closed. , easy to flow out, resulting in uneven distribution of micropores, and inconsistent cooling of the two surfaces of the high-temperature melt, resulting in structural differences between the two surfaces of the base film; Not timely

Method used

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  • Cooling roller device for preparing lithium-ion battery separator with three cellular structures
  • Cooling roller device for preparing lithium-ion battery separator with three cellular structures
  • Cooling roller device for preparing lithium-ion battery separator with three cellular structures

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0219] The polyethylene composition used to prepare the lithium-ion battery separator with three kinds of microporous structures comprises the following components by weight:

[0220]

[0221] in,

[0222] The number average molecular weight of high molecular polyethylene is 500,000,

[0223] The number average molecular weight of UHMWPE is 1.4 million,

[0224] The average molecular weight of white oil is 200,

[0225] The particle size of the nano-magnesium chloride is 50-70nm.

[0226] Above-mentioned composition is made lithium-ion battery diaphragm according to the following method:

[0227] Step 1), extrusion: melt and mix high molecular polyethylene and nano-magnesium chloride, add ultra high molecular polyethylene, 4,4-thiobis(6-tert-butyl meta cresol), 2,4-dihydroxybenzophenone, sodium octadecyl quaternary ammonium and Tween 80 are added to the extruder by the second feed port, white oil is fed by the first pore-forming agent feed port and The second pore-form...

Embodiment 2

[0234] The composition for preparing lithium-ion battery diaphragm comprises the following components by weight:

[0235]

[0236] in,

[0237] The number average molecular weight of high molecular weight polyethylene is 300,000.

[0238] The number average molecular weight of UHMWPE is 1.3 million.

[0239] The average molecular weight of white oil is 180;

[0240] The particle size of the nano-magnesium chloride is 60-90nm.

[0241] The above-mentioned composition is prepared lithium-ion battery diaphragm according to the following method:

[0242] Step 1), extrusion: melt and mix high molecular polyethylene and nano-magnesium chloride, add ultra high molecular polyethylene, 3,5-di-tert-butyl-4-hydroxytoluene, 4-benzoyloxy-2,2,6,6-tetramethylpiperidine, sodium octadecyl quaternary ammonium and lauric acid are fed into the extruder from the second feed port, white oil is fed from the first The feed port of the pore agent and the feed port of the second pore forming ag...

experiment example

[0254] Carry out following test to the battery diaphragm that embodiment and comparative example make, and test result is shown in Table 1:

[0255] (1) Measure the thickness of the battery diaphragm;

[0256] (2) Observing the microporous structure of the battery separator with a scanning electron microscope, and measuring the pore size;

[0257] (3) The porosity of the battery diaphragm is measured by a pressure pump instrument;

[0258] (4) Measure the air permeability of the battery separator using an air permeability tester;

[0259] (5) Adopt tensile tester to measure the longitudinal tensile strength and transverse tensile strength of battery separator;

[0260] (6) The puncture strength, longitudinal elongation and transverse elongation of the battery separator are measured by an electronic tensile machine;

[0261] (7) Measure the longitudinal thermal shrinkage and transverse thermal shrinkage of the battery separator with a battery separator heat shrinkage tester; ...

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Abstract

The invention provides a cooling roller device for preparing a lithium-ion battery separator with three cellular structures. The cooling roller device comprises a first casting piece roller, a second casting piece roller and a third casting piece roller; a cast film flowed from an extruding die head is fallen on the surface of the second casting piece roller to cool, and forms a storage film between the first casting piece roller and the second casting piece roller; the first casting piece roller and the second casting piece roller are mutually cooperated to cool two surfaces of the storage film at the same time; a space between the first casting piece roller and the second casting piece roller is adjusted through the adjusting device on the first casting piece roller, so as to form a casting piece with uniform thickness; besides, the casting piece is further cooled by the third casting piece roller, so as to carry out the subsequent technique. The cooling device in the production of the lithium-ion battery separator is featured by fast cooling, stable temperature control, and is able to control cellular structures on the prepared lithium-ion battery separator.

Description

technical field [0001] The invention relates to the technical field of battery diaphragm manufacturing, in particular to a cooling roller device in the production of lithium battery diaphragms. Background technique [0002] Lithium-ion batteries are widely used in the fields of electronic communication, energy storage, and power supply. They are mainly composed of positive electrodes, negative electrodes, electrolytes, and battery separators. Lithium-ion battery separators are a key component of lithium-ion batteries. They are porous thin-film materials. , its main function is to separate the positive and negative electrodes of the battery to prevent short circuit caused by contact between the two electrodes. In addition, it also has the function of allowing electrolyte ions to pass through. The performance of the separator determines the interface structure and internal resistance of the battery, which directly affects the battery. Excellent capacity, cycle and safety perfo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14
CPCH01M10/0525H01M50/403Y02E60/10
Inventor 张汉鸿
Owner LIAOYUAN HONGTU LI ION BATTERY DIAPHRAGM TECH
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