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A heat-shrinkable lithium-ion battery separator and the extractant composition used

A lithium-ion battery and extractant technology, which is applied in battery pack parts, secondary batteries, circuits, etc., can solve problems such as affecting the performance of battery separators, poor porogen occupancy, and porogen residues.

Active Publication Date: 2019-10-11
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: using a single liquid or oily organic substance as a pore-forming agent, the porosity of the pore-forming agent is poor, and the shape and size of the micropore structure in the battery separator are almost completely determined by the subsequent process. It is determined by the stretching process, the controllability is poor, and the porosity and air permeability of the prepared battery separator are low; a single organic solvent is used as the extraction agent, such as dichloromethane, the extraction is not complete, and there are still some components in the battery separator. Pore ​​agent residues not only cause low porosity and air permeability of the battery separator, but also affect the performance of the battery separator

Method used

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  • A heat-shrinkable lithium-ion battery separator and the extractant composition used
  • A heat-shrinkable lithium-ion battery separator and the extractant composition used
  • A heat-shrinkable lithium-ion battery separator and the extractant composition used

Examples

Experimental program
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Effect test

Embodiment 1

[0167] The composition for preparing the heat-shrinkable lithium-ion battery separator includes the following components by weight:

[0168]

[0169] in,

[0170] The number average molecular weight of high molecular polyethylene is 500,000,

[0171] The number average molecular weight of UHMWPE is 1.4 million,

[0172] The average molecular weight of white oil is 200,

[0173] The particle size of the nano-magnesium chloride is 50-70nm.

[0174]Prepare heat-shrinkable lithium-ion battery separators as follows:

[0175] Step 1), extrusion: mix high molecular weight polyethylene and magnesium chloride nanoparticles uniformly, and mix ultra high molecular weight polyethylene, 4,4-thiobis(6-tert-butyl m-cresol), 2,4-dihydroxy Benzophenone, sodium stearyl quaternary ammonium and Tween 80 are mixed evenly, and the above two mixtures are respectively put into the extruder to be heated and melted through two polyethylene composition feed ports, and two Put white oil into the ...

Embodiment 2

[0182] The composition for preparing the heat-shrinkable lithium-ion battery separator includes the following components by weight:

[0183]

[0184] in,

[0185] The number average molecular weight of high molecular weight polyethylene is 300,000,

[0186] The number average molecular weight of UHMWPE is 1.3 million,

[0187] The average molecular weight of white oil is 180,

[0188] The particle size of the nano-magnesium chloride is 60-90nm.

[0189] Prepare heat-shrinkable lithium-ion battery separators as follows:

[0190] Step 1), extrusion: mix high molecular polyethylene and magnesium chloride nanoparticles evenly, and ultra high molecular polyethylene, 3,5-di-tert-butyl-4-hydroxytoluene, 4-benzoyloxy-2, 2,6,6-Tetramethylpiperidine, octadecyl quaternary ammonium sodium and lauric acid are mixed evenly, and the above two mixtures are respectively fed into the extruder from two polyethylene composition feed ports to be heated and melted, and then extruded On the ...

Embodiment 3

[0197] The method used in this example is similar to the method used in Example 2, the only difference being that the composition used to prepare the heat-shrinkable lithium-ion battery separator includes the following components by weight:

[0198]

[0199] in,

[0200] The number average molecular weight of high molecular polyethylene is 400,000,

[0201] 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 separator, its preparation method and an extraction agent composition used. The extraction agent composition includes a first extraction agent and a second extraction agent, and the first extraction agent is A mixture of dichloromethane and phosphate ester, and the second extraction agent is water. The extraction agent composition provided by the invention can extract the pore-forming agent more completely, and the pore-forming agent remains less. The above-mentioned extraction agent composition is combined with a specific pore-forming agent and a specific ratio of high molecular polyethylene and ultra-high molecular polyethylene as raw materials. , and after specific equipment and processing technology, a battery separator with excellent heat shrinkage resistance and good comprehensive performance can be obtained.

Description

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

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/16H01M10/0525H01M50/446
CPCH01M10/0525H01M50/446Y02E60/10
Inventor 张汉鸿
Owner LIAOYUAN HONGTU LI ION BATTERY DIAPHRAGM TECH
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