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A method for preparing a diaphragm for high-safety, high-energy-density lithium-ion batteries

A high-energy density, lithium-ion battery technology, applied in battery pack components, separators/films/diaphragms/spacers, circuits, etc. Large-scale equipment is required to achieve the effect of good wettability, low equipment requirements, and uniform pore size distribution.

Active Publication Date: 2020-09-04
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Ding Huaiyu et al. (Preparation of polyphenylene sulfide porous membrane by thermal phase separation method, Acta Polymer Sinica 4 (2005), 551-559) studied the preparation of polyphenylene sulfide porous film by using diphenyl sulfone and benzophenone as diluents respectively. Membrane, not suitable for lithium-ion battery separator due to too large pore size
In addition, Chinese Invention Patent Publication Nos. CN103205123A and CN103178230A both provide a method for preparing polyphenylene sulfide separators for lithium-ion batteries by casting, extrusion, and stretching. The methods provided are cumbersome, require large-scale equipment, and cost too much
Chinese Invention Patent Publication No. CN104795525A provides a polyphenylene sulfide separator for lithium-ion batteries by using melt-blown polyphenylene sulfide non-woven fabric as the base cloth and performing heat setting treatment on it, but the polyphenylene sulfide separator prepared by this method The ether separator has problems such as large pores and thick thickness, which can easily cause problems such as micro-short circuit and self-discharge inside the lithium-ion battery.

Method used

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  • A method for preparing a diaphragm for high-safety, high-energy-density lithium-ion batteries
  • A method for preparing a diaphragm for high-safety, high-energy-density lithium-ion batteries

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Weigh 4g of polyphenylene sulfide resin, 9g of diphenylsulfone and 3g of polyethersulfone and blend them in a quartz bottle, heat to 250°C under nitrogen protection, and mechanically stir for 20min to obtain polyphenylene sulfide, diphenylsulfone and A blended solution of polyethersulfone (wherein the mass fraction of polyphenylene sulfide is 25%, and the mass ratio of the first diluent diphenyl sulfone and the second diluent polyethersulfone is 3:1). Then pour the blended solution into an ice-water bath to obtain a blended solid of the three, which is pulverized into powder particles with a pulverizer. Weigh 0.75g of powder sample, place it in a 40μm thick polyimide mold (area: 7cm×8cm), and use a flat vulcanizer to press at 4MPa and 250°C for 3min to obtain polyphenylene sulfide and diphenyl sulfone and polyethersulfone blend films. Finally, dimethyl sulfoxide was used to extract the diphenyl sulfone and polyether sulfone for 12 hours, and the extractant was evaporat...

Embodiment 2

[0032] Weigh 4g of polyphenylene sulfide resin, 10g of diphenyl sulfone and 2g of polyether sulfone blend, wherein the mass fraction of polyphenylene sulfide is 25%, the mass ratio of the first diluent diphenyl sulfone and the second diluent polyether sulfone The ratio is 5:1, and other experimental steps are the same as in Example 1 to prepare a polyphenylene sulfide porous membrane (diaphragm A2).

Embodiment 3

[0034] Weigh 3g of polyphenylene sulfide resin, 8g of diphenyl sulfone and 1g of polyether sulfone blend, wherein the mass fraction of polyphenylene sulfide is 25%, the mass ratio of the first diluent diphenyl sulfone and the second diluent polyether sulfone The ratio is 8:1, and other experimental steps are the same as in Example 1 to prepare a polyphenylene sulfide porous membrane (diaphragm A3).

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Abstract

The invention belongs to the field of lithium-ion battery separators, and relates to a preparation method for lithium-ion battery separators with high safety and high energy density. The separator is composed of special engineering plastic polyphenylene sulfide. The invention discloses the separator The preparation method is a thermally induced phase separation method using a two-component diluent, melt-blending the two-component diluent and polyphenylene sulfide, quenching, crushing into powder, pressing it into a film with a flat vulcanizing machine, and finally using The extractant is dried after removing the diluent to obtain a polyphenylene sulfide diaphragm. The method for preparing the diaphragm of the invention has simple process, low production cost and easy large-scale production. The polyphenylene sulfide separator involved in the present invention has the characteristics of large porosity, high temperature resistance, high mechanical strength, good wettability of electrolyte, etc., and is of great significance to the development of lithium-ion batteries with high safety and high energy density.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery separators, and in particular relates to a preparation method for lithium-ion battery separators with high safety and high energy density. Background technique [0002] Today, when the energy crisis and the global warming effect are getting worse, it is urgent to develop clean and green sustainable energy storage and conversion devices. Among them, lithium-ion batteries are widely used in mobile electronic devices and high-power power devices due to their advantages such as high energy density, long cycle life, environmental friendliness, and no memory effect. At the same time, with the deepening of the application of lithium-ion batteries in electric vehicles, hybrid vehicles, energy storage and other fields, the requirements for the safety performance and energy density of lithium-ion batteries are also getting higher and higher. Lithium-ion batteries are mainly composed of positive...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/14H01M2/16H01M50/403H01M50/411H01M50/414H01M50/497
CPCH01M50/40H01M50/409H01M50/403Y02E60/10
Inventor 肖敏刘俊辰孟跃中王拴紧韩东梅莫玉迪
Owner SUN YAT SEN UNIV
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