Preparation method and application of large-scale porous aramid fiber microfiber diaphragm

A technology for pre-oxidizing aramid and aramid chopped fibers, which is applied in fiber types, fiber treatment, electrochemical generators, etc. It can solve the problems of low heat resistance temperature, insufficient diaphragm strength, and poor wettability, and prevent short circuits. phenomenon, improvement of service life and safety, and growth-inhibiting effect

Inactive Publication Date: 2020-05-29
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problems of insufficient strength, low heat-resistant temperature and poor wettability of the existing lithium-ion battery dia

Method used

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  • Preparation method and application of large-scale porous aramid fiber microfiber diaphragm
  • Preparation method and application of large-scale porous aramid fiber microfiber diaphragm
  • Preparation method and application of large-scale porous aramid fiber microfiber diaphragm

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specific Embodiment approach 1

[0023] Specific implementation mode 1: This implementation mode records a method for preparing a large-scale porous aramid microfiber diaphragm, and the specific steps of the method are:

[0024] Step 1: Pre-oxidation process of aramid microfiber:

[0025] Add aramid chopped fibers into a DMSO reaction vessel containing potassium hydroxide and soak for 2 days; due to the strong alkalinity of potassium hydroxide, hydrogen ions in the microfibers inside the aramid chopped fibers will be captured , and weaken the interaction force between the fibers and microfibrils, so that it is easy to peel off the microfibrils on a large scale.

[0026] Step 2: Stripping of aramid microfibers:

[0027] Wash the mixed solution obtained in step 1 with pure dimethyl sulfoxide, remove excess potassium hydroxide, and disperse the pre-oxidized aramid chopped fibers after removing excess potassium hydroxide in dimethyl sulfoxide, Control the concentration of aramid chopped fibers in dimethyl sulfo...

specific Embodiment approach 2

[0030] Embodiment 2: The method for preparing a large-scale porous aramid microfiber diaphragm described in Embodiment 1, in step 1, the mass ratio of the aramid chopped fiber to potassium hydroxide is 1:1-1.5 ; The mass ratio of the aramid chopped fiber to dimethyl sulfoxide is 1:10-20.

specific Embodiment approach 3

[0031] Specific embodiment three: a method for preparing a large-scale porous aramid microfiber diaphragm described in specific embodiment one, in step two, the mass ratio of the pre-oxidized aramid chopped fiber to dimethyl sulfoxide is 1 ~3:100.

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Abstract

The invention discloses a preparation method and an application of a large-scale porous aramid fiber microfiber diaphragm, and belongs to the technical field of diaphragm preparation. The invention aims to solve problems of insufficient strength, a low heat-resistant temperature and poor wettability of anexisting lithium ion battery diaphragm. The method comprises the following steps of adding aramid fiber chopped fibers into a dimethyl sulfoxide reaction container containing potassium hydroxide for soaking; cleaning with pure dimethyl sulfoxide, removing redundant potassium hydroxide, dispersing the pre-oxidized aramid fiber chopped fibers into dimethyl sulfoxide, and mechanically separating; and carrying out suction filtration to prepare a diaphragm by adopting a vacuum suction filtration mode, after dimethyl sulfoxide is completely pumped, cleaning, removing redundant dimethyl sulfoxide, taking down the diaphragm, and compacting. Excellent mechanical properties of aramid fiber microfibers can inhibit growth of lithium dendrites in acycle process, prevent ashort circuit phenomenon caused by piercing the diaphragm and fulfill aims of prolonging aservice life of a battery and improving safety of the battery.

Description

technical field [0001] The invention belongs to the technical field of diaphragm preparation, and in particular relates to a preparation method and application of a large-scale porous aramid microfiber diaphragm. Background technique [0002] Lithium-ion batteries have the characteristics of large capacity, fast charging and discharging, and long service life, and are widely used in military and civilian fields. As one of the key components in the battery structure, the function of the separator is to isolate the positive and negative electrodes of the battery, and at the same time provide a migration channel for lithium ions during the cycle discharge process. Therefore, the performance of the separator directly affects the electrochemical performance and performance of the lithium-ion battery. Safe use performance. However, because the existing polyolefin separators tend to shrink in size at high temperatures, have poor wettability to electrolytes and are easily punctured...

Claims

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Application Information

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IPC IPC(8): H01M2/14H01M2/16H01M10/0525D06M13/268D06M101/36H01M50/403H01M50/44H01M50/491H01M50/494
CPCH01M10/0525D06M13/268D06M2101/36H01M50/411H01M50/44H01M50/403Y02E60/10
Inventor 王明强黄玉东刘丽王春艳
Owner HARBIN INST OF TECH
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