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A polyimide separator lithium-sulfur battery and a preparation method thereof

A polyimide, lithium-sulfur battery technology, applied in the field of chemical power sources, can solve problems such as poor safety, explosion, battery short circuit, etc., and achieve the effects of improving the utilization rate of active materials, wide application prospects, and improving safety performance.

Inactive Publication Date: 2019-01-18
GUIZHOU MEILING POWER SUPPLY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the mainstream products used as separator materials for lithium-sulfur batteries are polyethylene (PE) microporous membranes, polypropylene (PP) microporous membranes and polypropylene / polyethylene / polypropylene (PP / PE / PP) represented by Celgard in the United States. Polyolefin diaphragms such as three-layer microporous composite films, however, polyolefin diaphragms have limited liquid absorption performance and poor safety. When the battery temperature exceeds 70 ° C, the micropores of the diaphragm will be closed, affecting the normal operation of the battery. When the battery temperature exceeds 150°C, the diaphragm will melt, causing direct contact between the positive and negative electrodes, resulting in a short circuit of the battery, which may cause fire or explosion, and cause serious safety problems

Method used

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  • A polyimide separator lithium-sulfur battery and a preparation method thereof
  • A polyimide separator lithium-sulfur battery and a preparation method thereof

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preparation example Construction

[0015] as attached figure 1 Shown, the preparation method of polyimide diaphragm lithium-sulfur battery comprises the following steps:

[0016] (1) Preparation of the positive electrode sheet: first mix the sulfur-carbon composite material, conductive agent, and binder to prepare a slurry, then coat the slurry on the positive electrode current collector, and dry, roll, and cut , Prepared into a positive electrode sheet after vacuum drying;

[0017] (2) Preparation of negative electrode sheet: cutting metal lithium strip or lithium-containing alloy strip to prepare negative electrode sheet;

[0018] (3) Preparation of the diaphragm: the polyimide diaphragm is cut and prepared into a diaphragm;

[0019] (4) Battery assembly: Firstly, the prepared positive electrode sheet, diaphragm, and negative electrode sheet are wound or stacked to form a battery cell, and the battery cell is placed in an aluminum-plastic film casing, and then the edge is sealed and the electrolyte is injec...

Embodiment 1

[0032] Preparation of the positive electrode sheet: mix the sulfur / ketjen black composite material with a sulfur content of 60%, acetylene black, sodium carboxymethyl cellulose, and styrene-butadiene latex in a mass ratio of 80%: 10%: 4%: 6%. Deionized water was used as a solvent to prepare a slurry, and then coated on an aluminum foil with a thickness of 18 μm, pre-baked in an oven at 60 ° C, and then rolled, cut into pieces, and dried in a vacuum oven at 60 ° C for 24 hours to prepare a positive electrode piece.

[0033] The negative plate is made of metal lithium strip, and the capacity ratio of positive and negative active materials is 1:1.5; the diaphragm is made of polyimide diaphragm with a thickness of 25 μm. Wind the positive electrode sheet, separator, and negative electrode sheet to prepare the battery core, then put it into the formed aluminum-plastic film for edge sealing, and inject 1.0mol / L LiN(CF 3 SO 2 ) 2 +DOL / DME(v / v=1:1)+0.1mol / L LiNO 3 The electrolyte ...

Embodiment 2

[0037] Preparation of the positive electrode sheet: mix the sulfur / ketjen black composite material with a sulfur content of 70%, acetylene black, and polyvinylidene fluoride at a mass ratio of 85%:5%:10%, and use N-methylpyrrolidone as a solvent to prepare The slurry was then coated on an aluminum foil with a thickness of 18 μm, pre-baked in an oven at 60° C., rolled, cut into pieces, and dried in a vacuum oven at 60° C. for 24 hours to prepare a positive electrode sheet.

[0038]The negative plate is made of metal lithium strip, and the capacity ratio of positive and negative active materials is 1:1.5; the diaphragm is made of polyimide diaphragm with a thickness of 25 μm. Wind the positive electrode sheet, separator, and negative electrode sheet to prepare the battery core, then put it into the formed aluminum-plastic film for edge sealing, and inject 1.0mol / L LiN(CF 3 SO 2 ) 2 +DOL / DME(v / v=1:2)+0.2mol / L LiNO 3 The electrolyte solution is then sealed to prepare a polyimid...

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Abstract

The invention discloses a polyimide separator lithium-sulfur battery and a preparation method thereof. The method comprises the following steps: (1) firstly, a sulfur-carbon composite material, a conductive agent and a binder are mixed to prepare a slurry, and the slurry is coated on a positive electrode current collector to prepare a positive electrode sheet; 2, that metal lithium tape or the lithium-containing alloy tape is cut to prepare a negative electrode sheet; 3) that polyimide diaphragm is cut to prepare a diaphragm; (4) the prepared positive electrode sheet, diaphragm and negative electrode sheet are prepared into a cell, the cell is placed into an aluminum-plastic film shell, the edge is sealed, an electrolyte is injected, and sealing is performed. The invention can effectivelyimprove the utilization rate of the active material of the lithium-sulfur battery, improve the safety performance of the lithium-sulfur battery, broaden the application field of the lithium-sulfur battery, and has a wide application prospect in the fields of portable electronic equipment, electric vehicles, electric tools and the like.

Description

technical field [0001] The invention belongs to the technical field of chemical power sources, in particular to a polyimide diaphragm lithium-sulfur battery and a preparation method thereof. Background technique [0002] At present, with the rapid development of the economy, the energy crisis and environmental pollution are becoming more and more serious, the development and utilization of emerging green renewable energy and clean energy conversion and energy storage technologies in colleges and universities are imminent. Due to energy shortage and environmental problems, various electronic devices and new energy vehicles have developed rapidly. Since the commercialization of lithium-ion batteries in the 1990s, they have been widely used in various electronic fields and new energy fields. However, lithium-ion batteries are limited to Due to the characteristics of the battery itself, the energy density of lithium-ion batteries currently on the market is low and cannot meet th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M10/0525H01M4/62H01M50/403H01M50/423
CPCH01M4/621H01M4/624H01M10/0525H01M50/403H01M50/411Y02E60/10
Inventor 王振
Owner GUIZHOU MEILING POWER SUPPLY CO LTD
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