Membrane compounded by polyolefin porous membrane and aramid nano-fibers as well as compounding method and application of membrane

A technology of nanofibers and porous membranes, applied in the field of membrane materials for chemical power sources or chemical energy storage elements, can solve the problems of complex preparation process, increased interface resistance, poor tensile strength, etc., and achieve high ionic conductivity, interface resistance The effect of increasing and strengthening the binding force

Active Publication Date: 2014-12-10
GUANGZHOU CHEM CO LTD CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the techniques used in existing studies are either complicated in the preparation process and harsh in the preparation conditions, or the prepared film has a thick thickness and poor tensile strength, and cannot guarantee the firmness of the bond between the aramid fiber and the polyolefin matrix film. During the charge-discharge cycle, the matrix film is easy to peel off from the aramid fiber, resulting in an increase in interface resistance and a decrease in the electrochemical performance of the battery.

Method used

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  • Membrane compounded by polyolefin porous membrane and aramid nano-fibers as well as compounding method and application of membrane
  • Membrane compounded by polyolefin porous membrane and aramid nano-fibers as well as compounding method and application of membrane
  • Membrane compounded by polyolefin porous membrane and aramid nano-fibers as well as compounding method and application of membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A composite membrane of polypropylene porous membrane and aramid fiber nanofiber is prepared by the following method:

[0034] (1) The preparation method of aramid nanofiber dispersion can refer to the literature reported by M. Yang et al. (ACS Nano, 2011, 5(9), pp 6945-6954). Be the preparation of 2% aramid nanofiber dispersion liquid as an example with the mass fraction, its preparation method is: aramid yarn (the Kevlar fiber of Du Pont Company) is cut into the chopped fiber of length 1cm, then by mass ratio, 2 Add the obtained chopped aramid yarn, 2 parts of KOH (or t-BuOK) and 96 parts of dimethyl sulfoxide into a sealed container, and stir at room temperature for 3 to 10 days to prepare aramid nanofibers Dispersions.

[0035] (2) Using the method reported by Myung-Hyun Ryou et al. (see: Adv. Mater., 2011, 23, 3066–3070) using dopamine to self-polymerize at room temperature in a Tris-HCl buffer solution with pH = 8.5 to form porous polypropylene Phenolic hydroxyl...

Embodiment 2

[0038] A composite membrane of polypropylene porous membrane and aramid fiber nanofiber is prepared by the following method:

[0039] (1) The preparation of the aramid nanofiber dispersion is the same as in Example 1.

[0040] (2) The preparation of the polypropylene porous membrane with hydroxyl on the surface is the same as that in Example 1. The polypropylene porous membrane with hydroxyl on the surface and the compound of formula II (CAS: 3033-77-0, purchased from Sinopharm Group Chemical Reagent Co., Ltd.) React in water at 60°C for 5 hours to make the surface of the polypropylene porous membrane positively charged. Soak the positively charged polypropylene porous membrane in a concentration of 1×10 -2 % aramid nanofiber dispersion for 3 minutes, then take it out, wash it with water, and dry it at 80° C. for 10 minutes. This cycle is repeated 10 times to obtain a composite membrane with 10 layers of aramid nanofiber attached to the surface of the polypropylene porous mem...

Embodiment 3

[0042] A composite membrane of polypropylene porous membrane and aramid fiber nanofiber is prepared by the following method:

[0043] (1) The preparation of the aramid nanofiber dispersion is the same as in Example 1.

[0044] (2) The preparation of the polypropylene porous membrane with hydroxyl on the surface is the same as that in Example 1. The polypropylene porous membrane with hydroxyl on the surface and the compound of formula II (CAS: 3033-77-0, purchased from Sinopharm Group Chemical Reagent Co., Ltd.) React in water at 60°C for 5 hours to make the surface of the polypropylene porous membrane positively charged. Soak the positively charged polypropylene porous membrane in a concentration of 1×10 -2 % aramid nanofiber dispersion for 3 minutes, then take it out, wash it with water, and dry it at 80°C for 10 minutes. This cycle is repeated 15 times to obtain a composite membrane with 15 layers of aramid nanofibers attached to the surface of the polypropylene porous memb...

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Abstract

The invention belongs to the technical field of membrane materials of chemical power sources or chemical energy storage elements and discloses a membrane which has high size stability and is compounded by a polyolefin porous membrane and aramid nano-fibers, a compounding method of the membrane and application of the membrane to a lithium ion battery or other chemical energy storage elements. The compounding method comprises the following steps: introducing positive charges to the surface of the polyolefin porous membrane, soaking the polyolefin porous membrane with aramid nano-fiber dispersion liquid, taking out the polyolefin porous membrane, washing and drying, and soaking, washing and drying in a cyclic manner to obtain the compound membrane with a plurality of layers of aramid nano-fibers which are adsorbed on the surface of the polyolefin porous membrane. The compound membrane has low-temperature pore-closing property and high-temperature resistance and is suitable for electrochemical devices working at relatively high temperature; the compound membrane has relatively high ionic conductivity; the bonding force between the aramid nano-fibers and the polyolefin porous membrane is improved; the aramid nano-fibers are unlikely to be peeled from the polyolefin porous membrane in charging and discharging cycles; the interface resistance is unlikely to be increased along with the increase of the battery cycle number, so that the cycle performance of the battery is improved.

Description

technical field [0001] The invention belongs to the technical field of membrane materials for chemical power sources or chemical energy storage elements, in particular to a composite membrane of polyolefin porous membrane and aramid fiber nanofiber with good dimensional stability and its composite method and its application in lithium ion batteries or other chemical applications in energy storage devices. Background technique [0002] In 1991, Sony Corporation of Japan successfully introduced lithium-ion batteries to the market. Since then, the market share of lithium-ion batteries in the chemical power supply market has become larger and larger. Lithium-ion batteries have many advantages such as high specific energy, small size, light weight, long cycle life, no memory effect, small self-discharge effect, fast charging, and no pollution to the environment. [0003] The diaphragm is a key component in lithium-ion batteries. It plays the role of isolating the positive and ne...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16
CPCH01M10/0525H01M50/403H01M50/409H01M50/411H01M50/44H01M50/449Y02E60/10
Inventor 胡继文胡盛逾于法猛刘国军李妃胡美龙
Owner GUANGZHOU CHEM CO LTD CHINESE ACADEMY OF SCI
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