Battery diaphragm with three cellular structures and adopted pore-forming agents and extraction agents

A technology of microporous structure and battery diaphragm, which is applied in the direction of secondary batteries, structural parts, battery pack parts, etc., and can solve the problems of low porosity and air permeability of battery diaphragm, affecting the performance of battery diaphragm, and poor controllability, etc.

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

[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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  • Battery diaphragm with three cellular structures and adopted pore-forming agents and extraction agents
  • Battery diaphragm with three cellular structures and adopted pore-forming agents and extraction agents
  • Battery diaphragm with three cellular structures and adopted pore-forming agents and extraction agents

Examples

Experimental program
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Effect test

Embodiment 1

[0164] The composition used to prepare three kinds of microporous structure battery diaphragms comprises the following components by weight:

[0165]

[0166] in,

[0167] The number average molecular weight of high molecular polyethylene is 500,000,

[0168] The number average molecular weight of UHMWPE is 1.4 million,

[0169] The average molecular weight of white oil is 200,

[0170] The particle size of the nano-magnesium chloride is 50-70nm.

[0171]Three kinds of microporous structure battery separators were prepared according to the following methods:

[0172] 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 composit...

Embodiment 2

[0179] The composition used to prepare three kinds of microporous structure battery diaphragms comprises the following components by weight:

[0180]

[0181] in,

[0182] The number average molecular weight of high molecular weight polyethylene is 300,000,

[0183] The number average molecular weight of UHMWPE is 1.3 million,

[0184] The average molecular weight of white oil is 180,

[0185] The particle size of the nano-magnesium chloride is 60-90nm.

[0186] Three kinds of microporous structure battery separators were prepared according to the following methods:

[0187] 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 ...

Embodiment 3

[0194] The method used in this example is similar to the method used in Example 2, the only difference being that the compositions used to prepare three kinds of microporous structure battery separators include the following components by weight:

[0195]

[0196] in,

[0197] The number average molecular weight of high molecular polyethylene is 400,000,

[0198] The number average molecular weight of UHMWPE is 1.4 million.

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Abstract

The invention discloses a battery diaphragm with three cellular structures, a preparing method thereof, and adopted pore-forming agents and extraction agents. The pore-forming agents include an organic pore-forming agent and an inorganic pore-forming agent, wherein the organic pore-forming agent is high-boiling point micromolecular organic matter, and the inorganic pore-forming agent is nano-particles of water-soluble inorganic salt. The extraction agents include a first extraction agent and a second extraction agent, wherein the first extraction agent is a mixture of dichloromethane and phosphate, and the second extraction agent is water. By the adoption of the pore-forming agents, the size, shape and distribution of formed pores can be well controlled, and the porosity and venting quality of the battery diaphragm can be improved; extraction can be achieved more completely by means of the extraction agents, and the amount of pore-forming agent residue is small; the pore-forming agents, the extraction agents, and macromolecular polyethylene and ultrahigh molecular polyethylene which are matched according to a specific ratio serve as raw materials, and the battery diaphragm with three cellular structures and high comprehensive performance can be obtained through specific devices and processing technology.

Description

technical field [0001] The invention relates to a preparation process of battery diaphragms, in particular to three kinds of microporous structure battery diaphragms and their preparation methods as well as used pore-forming agents and extractants. 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 imp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16C08J5/22
CPCC08J5/2231C08J2323/06C08K2201/011C08L23/06C08L2205/025C08L2205/03C08L2205/035H01M10/0525H01M50/403H01M50/446C08L91/06C08L71/00C08K13/02C08K2003/166C08K5/375C08K5/132C08K5/19C08K5/09C08K5/13C08K5/3435Y02E60/10
Inventor 张汉鸿
Owner LIAOYUAN HONGTU LI ION BATTERY DIAPHRAGM TECH
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