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A modified polyolefin separator material for lithium sulfur battery and a preparation method thereof

A polyolefin and diaphragm material technology, which is applied in battery pack parts, circuits, electrical components, etc., can solve the problems of low ionic conductivity and polysulfide diffusion in the diaphragm, and achieve improved rate performance, process control, and preparation. low cost effect

Inactive Publication Date: 2019-01-11
CHENDU NEW KELI CHEM SCI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problems of low ion conductivity and serious polysulfide diffusion of existing lithium-sulfur battery separators, the present invention proposes a modified polyolefin separator material for lithium-sulfur batteries and a preparation method, in which maleic anhydride is mixed with The polyolefin separator is compounded, and the modified polyolefin separator with rich carboxyl groups on the surface is obtained by hydrolysis of maleic anhydride, which inhibits polysulfides from passing through the separator and improves the rate performance and cycle stability of the battery

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Weigh 10 parts by mass of polypropylene with a melt index of 4, 16 parts by mass of maleic anhydride, 36 parts by mass of NH 4 OH solution, 0.5 parts by mass of 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane, and an appropriate amount of deionized water;

[0029] (2) Blending the polyolefin and the initiator by ball milling, the speed of the ball milling is 400 rpm, and the ball milling time is 20 minutes, to obtain the mixed polyolefin raw material;

[0030] (3) Add maleic anhydride to the mixed polyolefin raw material, granulate the mixed solid through a screw extruder, control the temperature of the screw extruder to 200°C, and the granulation pressure of the screw extruder to 2Mpa , to obtain precursor particles;

[0031] (4) Put the precursor particles into a hot press, heat the temperature to 290°C, pressurize to 4Mpa, press the particles into a sheet-like membrane by hot-pressing, and immerse the sheet-like membrane in deionized aqueous solution During the hy...

Embodiment 2

[0033](1) Weigh 8 parts by mass of polyethylene with a melt index of 5, 16 parts by mass of maleic anhydride, 35 parts by mass of NaHCO 3 Alkaline solution and 0.5 parts by mass of dicumyl peroxide, an appropriate amount of deionized water;

[0034] (2) Blending the polyethylene and dipentasulfurizing agent (2,5-dimethyl-2) by ball milling, the speed of ball milling is 200rpm, and the ball milling time is 30min, to obtain mixed polyolefin raw materials;

[0035] (3) Add maleic anhydride to the mixed polyethylene raw material, granulate the mixed solid through a screw extruder, control the temperature of the screw extruder to 210°C, and the granulation pressure of the screw extruder to 2Mpa , to obtain precursor particles;

[0036] (4) Put the precursor particles into a hot press, heat the temperature to 250°C, pressurize to 5Mpa, press the particles into a sheet-like membrane by hot-pressing, and immerse the sheet-like membrane in deionized aqueous solution In the hydrolysis...

Embodiment 3

[0038] (1) 9 parts by mass of a composite material of polyethylene and polypropylene with a melt index of 3, 15 parts by mass of maleic anhydride, 43 parts by mass of alkaline solution, 1.8 parts by mass of dicumyl peroxide, and deionized water Appropriate amount;

[0039] (2) Blending the polyolefin and the initiator by ball milling, the speed of the ball milling is 500 rpm, and the ball milling time is 25 minutes, to obtain the mixed polyolefin raw material;

[0040] (3) Add maleic anhydride to the mixed polyolefin raw material, granulate the mixed solid through a screw extruder, control the temperature of the screw extruder to 190°C, and the granulation pressure of the screw extruder to 2Mpa , to obtain precursor particles;

[0041] (4) Put the precursor particles into a hot press, heat the temperature to 280°C, pressurize to 4Mpa, press the particles into a sheet-like membrane by hot-pressing, and immerse the sheet-like membrane in deionized aqueous solution During the h...

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Abstract

The invention provides a modified polyolefin separator material of lithium sulfur battery and a preparation method thereof. As that polyolefin and the initiator are blende by physical means, Maleic anhydride is then added, the mixed solids are pelletized through a screw extruder, a membrane material of polyolefin graft maleate is obtain by hot pressing that particle into a sheet film material, immersing the sheet film material in a deionized aqueous solution, slowly dropping an alkali solution to keep the aqueous solution neutral, react until the pH of the solution is stabilized to be neutral,and slowly evaporating the solvent to obtain the polyolefin graft maleate membrane material. A surface of that modify polyolefin diaphragm material is provided with a large amount of negative chargedure the ionization process. The lithium ion can be adsorbed and conducted more effectively and repel each other with polysulfide, thereby inhibiting polysulfide from passing through the separator toreach the negative electrode, improving the rate performance and cycle stability of the battery, and overcoming the problems of low ionic conductivity and serious polysulfide diffusion of the separator of the prior lithium-sulfide battery.

Description

technical field [0001] The invention relates to the field of lithium-sulfur battery materials, in particular to a modified polyolefin diaphragm material for a lithium-sulfur battery and a preparation method thereof. Background technique [0002] With the rapid development of electronic information technology, the portable electronic equipment, digital products, notebook computer market, especially with the potential market demand in the field of intelligent communication and electric vehicles, has greatly promoted the demand for small volume, large capacity rechargeable batteries , due to the continuous increase of battery consumption and the continuous improvement of people's awareness of energy conservation and environmental protection, the task of developing a secondary battery system with high energy density, higher specific capacity and cycle life is very urgent. [0003] Lithium-sulfur battery is a new type of lithium-ion secondary battery with a very high theoretical ...

Claims

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Application Information

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IPC IPC(8): H01M2/14H01M2/16C08F255/02C08F222/06C08F8/12H01M50/403H01M50/417H01M50/497
CPCC08F8/12C08F255/02H01M50/403H01M50/411C08F222/06Y02E60/10
Inventor 陈庆廖健淞
Owner CHENDU NEW KELI CHEM SCI CO LTD
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