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Polyimide/magnesium oxide composite lithium ion battery diaphragm and preparation method thereof

A polyimide, ion battery technology, applied in the direction of secondary batteries, battery pack components, circuits, etc., can solve the problems of reducing porosity, blocking holes, reducing battery power density, etc., to improve flame retardancy, high temperature Good dimensional stability

Pending Publication Date: 2021-11-30
北京宇程科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these ceramic-based coatings, when coated on conventional porous PE membranes, can block pores or reduce porosity, which reduces their ionic conductivity and ultimately reduces the power density of the battery

Method used

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  • Polyimide/magnesium oxide composite lithium ion battery diaphragm and preparation method thereof
  • Polyimide/magnesium oxide composite lithium ion battery diaphragm and preparation method thereof
  • Polyimide/magnesium oxide composite lithium ion battery diaphragm and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Weigh 2.03g of pyromellitic dianhydride (PMDA) and 1.84g of 4,4'-diaminodiphenyl ether (ODA) at a molar ratio of 1:1, and dissolve all ODA in 30ml of N,N- In the dimethylformamide (DMF) solvent, after being completely dissolved, PMDA was added in batches under the condition of an ice-water bath to prepare a polyamic acid solution with a solid content of 12%. (2) The polyamic acid solution is loaded into a 20ml syringe, and the polyamic acid nanofiber film is prepared by electrospinning technology. The specific parameters of the electrospinning machine are spinning voltage: 25kV; spinning temperature: room temperature; spinning humidity : 40%; syringe needle diameter: No. 12; receiving roller speed: 500r / min; receiving distance: 20cm. The prepared polyamic acid nanofiber membrane was dried in an ultra-clean bench for 12 hours. (3) Weigh 1.90 g of anhydrous magnesium chloride, dissolve it in 100 ml of deionized water, and wait until completely dissolved to obtain a 0...

Embodiment 2

[0031](1) Weigh 2.62g of pyromellitic dianhydride (PMDA) and 2.38g of 4,4'-diaminodiphenyl ether (ODA) at a molar ratio of 1:1, start mechanical stirring, and dissolve ODA in 30ml of In N,N-dimethylformamide (DMF) solvent, after being completely dissolved, under the condition of ice-water bath, add PMDA in batches, keep mechanical stirring until the cladding effect occurs, and obtain a polyamide with a solid content of 15%. acid solution. (2) The polyamic acid solution is packed into a 20ml syringe, and the polyamic acid nanofiber film is prepared by electrospinning technology. The specific parameters of the electrospinning machine are spinning voltage: 25kV; spinning temperature: room temperature; Humidity: 40%; Syringe needle diameter: No. 12; Receiving roller speed: 500r / min; Receiving distance: 20cm. The prepared polyamic acid nanofiber membrane was dried in an ultra-clean bench for 12 hours. (3) Weigh 0.95 g of anhydrous magnesium chloride, dissolve it in 100 ml of deio...

Embodiment 3

[0035] (1) Weigh 2.67g of 4,4'-(hexafluoroisopropylene) diphthalic anhydride (6FDA) and 1.20g of 4,4'-diaminodiphenyl ether (ODA) at a molar ratio of 1:1, and turn on the mechanical stirring , all ODA was dissolved in 30ml of N,N-dimethylformamide (DMF) solvent. After it was completely dissolved, 6FDA was added in batches under the condition of ice-water bath, and mechanical stirring was kept until the axial wrapping effect appeared to obtain A polyamic acid solution with a solid content of 12%. (2) The polyamic acid solution is packed into a 20ml syringe, and the polyamic acid nanofiber film is prepared by electrospinning technology. The specific parameters of the electrospinning machine are spinning voltage: 30kV; spinning temperature: room temperature; Humidity: 40%; syringe needle diameter: No. 12; receiving roller speed: 500r / min; receiving distance: 20cm. The prepared polyamic acid nanofiber membrane was dried in an ultra-clean bench for 12 hours. (3) Weigh 1.90 g of a...

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Abstract

The invention provides a preparation method of a polyimide / magnesium oxide composite lithium ion battery diaphragm. According to the method, Mg < 2 + > metal ions are introduced onto polyamide acid fibers by adopting an ion exchange method, and subsequent heat treatment is carried out to simultaneously realize imidization of polyamide acid and formation of MgO nanoparticles. The method comprises the following steps of: firstly, synthesizing polyamide acid serving as a spinning solution by taking diamine and dianhydride as monomers, and obtaining a polyamide acid nanofiber membrane through electrostatic spinning; then preparing a magnesium salt solution with a certain concentration, immersing the polyamide acid nanofiber membrane into the magnesium salt solution for a period of time to perform ion exchange, performing cleaning and drying; and finally performing thermal imidization to obtain the polyimide / magnesium oxide composite nanofiber membrane. The method disclosed by the invention is simple and low in cost; the surface of the polyimide nanofiber membrane is coaxially coated withmagnesium oxide, and therefore, the wettability of a diaphragm electrolyte is increased, the flame retardance of the diaphragm electrolyte is improved; and the method has a wide application prospect in the field of novel lithium ion battery diaphragms.

Description

technical field [0001] The invention belongs to the technical field of polyimide nanofiber membranes, and relates to a polyimide / magnesium oxide composite lithium-ion battery diaphragm and a preparation method thereof. Background technique [0002] The rapid development of the digital age has made lithium-ion batteries indispensable in everyday life. At present, the research and development focus of lithium-ion batteries mainly includes increasing energy density, prolonging service life and improving safety. These properties largely depend on the basic components of Li-ion batteries, namely the positive and negative electrodes, electrolyte, and separator, so the design and development of electrodes, electrolytes, and separators are of practical importance. As the core component of lithium-ion batteries, the separator material plays a vital role in the manufacture of the battery and is called the "third electrode" of the battery. The diaphragm can avoid direct contact betwe...

Claims

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Application Information

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IPC IPC(8): H01M50/423H01M10/0525H01M50/403H01M50/431H01M50/44H01M50/446
CPCH01M50/403H01M50/423H01M50/431H01M50/44H01M10/0525H01M50/446Y02E60/10
Inventor 王杰贾南方
Owner 北京宇程科技有限公司
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