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Method for modifying meta-aramid lithium ion battery diaphragm by SiO2 nanoparticles

A technology of lithium-ion batteries and nanoparticles, applied in secondary batteries, battery components, circuits, etc., can solve problems such as interface defects and inability to effectively improve PMIA diaphragms

Inactive Publication Date: 2021-09-10
CNOOC TIANJIN CHEM RES & DESIGN INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention aims at current SiO 2 Nanoparticles are prone to agglomeration when modifying PMIA, causing interface defects, and can not effectively improve the PMIA diaphragm. It provides a simple operation, suitable for large-scale industrial applications, and can realize SiO 2 The uniform modification of nanoparticles on the surface of PMIA film improves the mechanical properties of the separator and obtains SiO with good battery cycle performance 2 Preparation method of inorganic nanoparticle modified meta-aramid lithium battery diaphragm

Method used

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  • Method for modifying meta-aramid lithium ion battery diaphragm by SiO2 nanoparticles
  • Method for modifying meta-aramid lithium ion battery diaphragm by SiO2 nanoparticles
  • Method for modifying meta-aramid lithium ion battery diaphragm by SiO2 nanoparticles

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Weigh 5 g of Tween 80 and add it to 500 ml of deionized water, stir evenly, add meta-aramid (prepared by NIPS method) diaphragm, and stir slowly for 2 hours. After the obtained pretreated membrane is washed, filtered and dried, the pretreated membrane is obtained. Take another beaker, mix evenly according to the volume ratio of TEOS:ammonia:water:ethanol is 1:1:3:80, stir for 30s, put the pretreatment diaphragm into it, stir slowly for 2h, take it out, dry, and confirm by SEM image SiO 2 Evenly distributed (such as figure 1 shown). Finally, the ionic conductivity of the PMIA membrane was measured to be 0.78mS / cm, and the battery had a capacity retention rate of 88.1% after 50 cycles of charging and discharging, which was significantly better than that of the battery assembled with the PMIA membrane (see Figure 4 )

Embodiment 2

[0025] Weigh 10 g of Tween 20 and add it to 500 ml of deionized water, stir evenly, add meta-aramid (prepared by NIPS method) diaphragm, and stir slowly for 1 hour. After the obtained pretreated membrane is washed, filtered and dried, the pretreated membrane is obtained. Take another beaker, mix evenly according to the volume ratio of TEOS:ammonia:water:ethanol is 1:1.5:5:120, stir for 60s, put the pretreatment diaphragm into it, stir slowly for 4h, take it out, dry, and confirm by SEM image SiO 2 Evenly distributed. Finally, the ionic conductivity of the PMIA separator was measured to be 0.75mS / cm, and the capacity retention rate of the battery after 50 charge-discharge cycles was 87.5%, which was significantly better than that of the battery assembled with PMIA membrane.

Embodiment 3

[0027] Weigh 5 g of γ-aminopropyltriethoxysilane and add it to 500 ml of ethanol, stir evenly, add PP diaphragm, and stir slowly for 2 hours. After the obtained pretreated membrane is washed, filtered and dried, the pretreated membrane is obtained. Take another beaker, mix evenly according to the volume ratio of TEOS:ammonia:water:ethanol 1:1:4:80, stir for 30s, put the pretreatment diaphragm into it, stir slowly for 3h, take it out, dry it, and formalize it by SEM image SiO 2 Evenly distributed. Finally, the ionic conductivity of the PMIA membrane was measured to be 0.74mS / cm, and the capacity retention rate of the battery after 50 charge-discharge cycles was 87.8%, which was significantly better than that of the battery assembled with PMIA membrane.

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Abstract

The invention discloses a method for modifying a meta-aramid lithium ion battery diaphragm by SiO2 nanoparticles. The method comprises the following steps: slowly putting a meta-aramid lithium ion battery diaphragm into a nonionic surfactant or silane coupling agent solution, magnetically stirring, adding deionized water, carrying out vacuum drying, and slowly putting the obtained lithium ion battery diaphragm into a solution of tetraethoxysilane, water, ethanol and ammonia water; and stirring, washing with the deionized water, and drying in vacuum. According to the diaphragm prepared by the invention, the SiO2 nanoparticles are uniformly dispersed on the surface and inside of the meta-aramid diaphragm so that the performance of the lithium ion battery is improved. Meanwhile, by adding the SiO2 nanoparticles, the mechanical strength of the battery diaphragm is improved, and the SiO2 nanoparticles belong to inorganic matters and are excellent in temperature resistance so that the temperature resistance of the battery diaphragm can be improved.

Description

technical field [0001] The invention relates to a preparation method of a lithium battery composite diaphragm, in particular to a SiO 2 A method for preparing a meta-aramid lithium battery separator modified by inorganic nanoparticles. Background technique [0002] Lithium batteries are widely used not only in portable electronic devices (such as mobile phones, laptop computers, digital cameras), but also in hybrid electric vehicles and satellites. With the rapid development of lithium-ion batteries in high-power applications, the safety and reliability of these batteries has become critical. In the battery system, the role of the battery separator is to prevent direct contact between the positive and negative electrodes, avoid short circuits, and at the same time promote ion transmission in the battery, which is one of the most critical components to ensure the safe operation of the battery. [0003] At present, commercial battery separators are mainly polyolefin separato...

Claims

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Application Information

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IPC IPC(8): H01M50/403H01M50/446H01M50/411H01M50/443H01M50/431H01M50/489H01M10/0525
CPCH01M50/403H01M50/446H01M50/411H01M50/443H01M50/431H01M50/489H01M10/0525Y02E60/10
Inventor 陈赞王建杰于海斌段翠佳袁标严硕李阳
Owner CNOOC TIANJIN CHEM RES & DESIGN INST
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