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Multi-layer diaphragm material of lithium ion battery and preparation method thereof

A technology of multi-layer film and hybrid material, applied in the field of lithium-ion battery separator material and its preparation, can solve the problem of inability to exert the nano-performance of attapulgite, and achieve excellent thermal dimensional stability, improved liquid retention rate, and wide application. Foreground effect

Active Publication Date: 2018-09-07
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But the current problem is that at the nanometer scale, the macroscopic quantum tunneling effect, quantum size effect and surface / interface effect make the nanoparticles have extremely high surface energy, and it is easy to agglomerate in the polymer matrix, so that attapulgite cannot play a role. Special nano properties (Yang H, Pu H, Gong F. Preparation of poly(methyl methacrylate)-grafted attapulgite by surface-initiated radical polymerization. Journal of Applied Polymer Science, 2014, 131(22): 41062)

Method used

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  • Multi-layer diaphragm material of lithium ion battery and preparation method thereof
  • Multi-layer diaphragm material of lithium ion battery and preparation method thereof
  • Multi-layer diaphragm material of lithium ion battery and preparation method thereof

Examples

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Effect test

Embodiment 1

[0069] Example 1: Using solid paraffin as diluent and petroleum ether as extractant, microlayer co-extrusion technology and heat-induced phase separation method were used to prepare polyethylene / polypropylene multilayer porous diaphragm. Specific steps are as follows:

[0070] (1) Preparation of polyethylene / polypropylene masterbatch

[0071] Before micro-layer co-extrusion, the solid paraffin is pre-dispersed in polyethylene resin and polypropylene resin, and the above components are pre-mixed, and put into a twin-screw extruder to prepare a masterbatch of polyethylene resin and polypropylene resin .

[0072] The raw material composition of the masterbatch of polyethylene resin is calculated in parts by mass:

[0073] 45 parts of polyethylene resin,

[0074] 55 parts of solid paraffin.

[0075] The raw material composition of the masterbatch of polypropylene resin is calculated in parts by mass:

[0076] 45 parts of polypropylene resin,

[0077] 55 parts of solid paraff...

Embodiment 2

[0092] Example 2: Using solid paraffin as diluent and petroleum ether as extractant, polyethylene / polypropylene (6% polymethyl methacrylate modified attapulgite) was prepared by micro-layer co-extrusion technology and thermal phase separation method Layer porous membrane. Specific steps are as follows:

[0093] (1) Preparation of polymethyl methacrylate modified attapulgite

[0094] Attapulgite in 1 mol L -1Stir and react in hydrochloric acid for 3 h, then let stand for 12 h, filter and wash until neutral, dry and pulverize, weigh 1 part and disperse in xylene, vibrate ultrasonically for 1 h, add 1 part of 3-aminopropyl triethoxy base silane, heated to 80°C and stirred at constant temperature for 6 h, the product was filtered, washed and dried, crushed and passed through a 200-mesh sieve, and the product was designated as ATP-APTES. Weigh 1 part of ATP-APTES and disperse in ethyl acetate, and oscillate ultrasonically for 2 h; weigh 3 parts of azodicyanovaleric acid and diss...

Embodiment 3

[0108] Example 3: Using solid paraffin as diluent and petroleum ether as extractant, polyethylene / polypropylene (9% polymethyl methacrylate modified attapulgite) was prepared by micro-layer co-extrusion technology and thermal phase separation method Layer porous membrane. Specific steps are as follows:

[0109] (1) Preparation of polymethyl methacrylate modified attapulgite

[0110] Attapulgite in 1 mol L -1 Stir in hydrochloric acid for 8 hours and let stand for 12 hours, filter and wash until neutral, dry and pulverize, weigh 2 parts and disperse in xylene, ultrasonically shake for 1 hour, add 2 parts of 3-aminopropyl triethoxy base silane, heated to 80°C and stirred at constant temperature for 6 h, the product was filtered, washed and dried, crushed and passed through a 200-mesh sieve, and the product was designated as ATP-APTES. Weigh 2 parts of ATP-APTES and disperse in ethyl acetate, and ultrasonically shake for 3 h; weigh 5 parts of azodicyanovaleric acid and dissolv...

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Abstract

The invention belongs to the technical field of macromolecular materials, in particular to a multi-layer diaphragm material of a lithium ion battery with excellent heat stability and a preparation method thereof. The multi-layer diaphragm material of the lithium ion battery is an attapulgite multi-layer film modified by vinyl resin / allyl resin-polymethyl methacrylate. The preparation method comprises the following steps of firstly, modifying the attapulgite by methyl methacrylate, so as to obtain an attapulgite-polymethyl methacrylate hybrid material; then, mixing the attapulgite-polymethyl methacrylate hybrid material and the vinyl resin / allyl resin; finally, preparing the multi-layer diaphragm of the lithium ion battery by thermally induced phase separation and microlayer coextrusion methods. The multi-layer diaphragm material has the advantages that an alternative layered structure is adopted, the pore structure is rich, and the thickness is uniform; the heat stability and electrochemical property are excellent. The preparation method has the advantages that the technology is simple, the cost of raw materials is low, and the large-scale production effect is realized.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a lithium-ion battery diaphragm material and a preparation method thereof. Background technique [0002] The rapid development of economic globalization will bring double consumption of energy. Facing the two urgent problems of environmental pollution and resource depletion, the development of new, efficient and clean renewable energy is very necessary, and green energy will become an important aspect of future development. The most important. Electrochemical energy is an efficient and clean energy conversion and storage technology, mainly including fuel cells, secondary chemical power sources and supercapacitors. Among them, the lithium-ion battery (LIB) has attracted the attention of the scientific research community and the industry due to its advantages such as high working voltage, high energy density, long cycle life and environmental friendliness. P...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M10/0525H01M50/403H01M50/417H01M50/457H01M50/489
CPCH01M10/0525H01M50/403H01M50/411H01M50/449Y02E60/10
Inventor 浦鸿汀李亚捷
Owner TONGJI UNIV
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