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Heat-shrinkage-resistant lithium ion battery diaphragm and pore-forming agent composition adopted by same

A technology for lithium-ion batteries and battery diaphragms, which is applied to battery components, separators/films/diaphragms/spacers, circuits, etc., and can solve the problem of incomplete sealing of porogens, easy outflow, and difficulty in controlling consistency And other issues

Active Publication Date: 2017-01-11
LIAOYUAN HONGTU LI ION BATTERY DIAPHRAGM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] There are some defects in the traditional battery separator wet preparation process, including: in the casting process, a casting roll with cooling function is usually used for single-sided cooling, and the pore-forming agent is not completely sealed and easy to flow out, resulting in uneven distribution of micropores ;The extrusion equipment in different production steps is different, resulting in different product quality and appearance, and it is difficult to control the consistency; usually the surface of the extrusion equipment and stretching equipment is smooth, and the surface of the manufactured diaphragm is smooth, and the adhesion ability with other substances Poor, which is not conducive to the development of new battery separators; drying equipment after extraction usually uses two methods of water gun and air gun at the same time, resulting in water marks on the surface of the separator, and the flatness is not good enough

Method used

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  • Heat-shrinkage-resistant lithium ion battery diaphragm and pore-forming agent composition adopted by same
  • Heat-shrinkage-resistant lithium ion battery diaphragm and pore-forming agent composition adopted by same
  • Heat-shrinkage-resistant lithium ion battery diaphragm and pore-forming agent composition adopted by same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0187] The polyethylene composition used to prepare heat-shrinkable lithium-ion battery separators includes the following components by weight:

[0188]

[0189]

[0190] in,

[0191] The number average molecular weight of high molecular polyethylene is 500,000,

[0192] The number average molecular weight of UHMWPE is 1.4 million,

[0193] The average molecular weight of white oil is 200,

[0194] The particle size of the nano-magnesium chloride is 50-70nm.

[0195] Above-mentioned composition is made lithium-ion battery diaphragm according to the following method:

[0196] 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-forming agent feed port...

Embodiment 2

[0203] The composition for preparing lithium-ion battery diaphragm comprises the following components by weight:

[0204]

[0205] in,

[0206] The number average molecular weight of high molecular weight polyethylene is 300,000.

[0207] The number average molecular weight of UHMWPE is 1.3 million.

[0208] The average molecular weight of white oil is 180;

[0209] The particle size of the nano-magnesium chloride is 60-90nm.

[0210] The above-mentioned composition is prepared lithium-ion battery diaphragm according to the following method:

[0211] 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...

Embodiment 3

[0218] The method used in this embodiment is similar to the method used in Example 2, except that the polyethylene composition comprises the following components by weight:

[0219]

[0220] in,

[0221] The number average molecular weight of high molecular weight polyethylene is 400,000.

[0222] The number average molecular weight of UHMWPE is 1.4 million.

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Abstract

The invention discloses a heat-shrinkage-resistant lithium ion battery diaphragm and a pore-forming agent composition adopted by the same. The pore-forming agent composition comprises an organic pore-forming agent and an inorganic pore-forming agent, wherein the organic pore-forming agent is high-boiling-point low molecular weight organic matter preferably; the inorganic pore-forming agent is water-soluble inorganic nanoparticles preferably; and the pore-forming agent and the optional additive are jointly added to a film-forming material to form a lithium ion battery diaphragm with three kinds of microporous structures through processing of casting pieces. In addition, the heat-shrinkage-resistant lithium ion battery diaphragm has relatively low closed-hole temperature, high heat shrinkage resistance, high tensile strength, high puncture strength and relatively high diaphragm-rupture temperature, thereby ensuring safety in preparation and usage of the lithium ion battery.

Description

technical field [0001] The invention relates to a preparation process of a battery separator, in particular to a heat-shrinkable lithium-ion battery separator and a pore-forming agent composition used in the preparation process. 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. The short circuit allows electrolyte ions to pass through at the same time, thereby generating current. The current battery separator is mostly a polyolefin film with a microporous structure, and its performance determines the interface structure and internal resistance of the battery, which directly affects the capacity, cycle and safety of the battery. Performance and other characteristics, a battery separator with excellent performance plays an important role in improving the overall performance of ...

Claims

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Application Information

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IPC IPC(8): H01M2/14H01M2/16H01M50/403H01M50/443H01M50/446H01M50/489
CPCH01M50/40H01M50/403H01M50/446Y02E60/10
Inventor 张汉鸿
Owner LIAOYUAN HONGTU LI ION BATTERY DIAPHRAGM TECH
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