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Application of composite membrane in lithium-sulfur battery

A lithium-sulfur battery and composite membrane technology, applied in the direction of lithium storage battery, secondary battery, battery pack components, etc., can solve the problems of consumption of lithium nitrate, poor battery stability, low capacity retention rate, etc., and achieve delayed use and good utilization. , the effect of improving the capacity retention rate

Active Publication Date: 2020-06-02
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, Zhang et al. reported that under low voltage, nitrate would undergo an irreversible reaction at the positive electrode and consume lithium nitrate.
The patent CN1930725 published by Cyon Energy Co., Ltd. of the United States also discloses adding nitrate additives to the electrolyte of lithium-sulfur batteries to reduce the self-discharge of lithium-sulfur batteries, but these technical solutions containing N-O additives in the electrolyte are due to the above reasons , there will be a series of technical problems such as low capacity retention rate and poor battery stability. It can be said that the content of nitrate ions in the battery and how to better manage the use of nitrate ions are the key technologies that determine the coulombic efficiency and capacity stability of the battery. question

Method used

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  • Application of composite membrane in lithium-sulfur battery
  • Application of composite membrane in lithium-sulfur battery
  • Application of composite membrane in lithium-sulfur battery

Examples

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Embodiment 1

[0028] Preparation of a composite membrane rich in nitrate ions: soak 1 g of chloromethyl polystyrene in 10% aqueous solution of trimethylamine for 24 hours at room temperature to obtain quaternized polystyrene with a quaternization degree of 100 mmol / g. The degree of chloromethyl is 100mmol / g, the quaternized polystyrene and lithium nitrate are mixed and dissolved in N-methylpyrrolidone (NMP) according to the mass ratio of 1:1, and a film-forming solution with a concentration of 10% is prepared. The film-forming solution is cast to form a film. Naturally dry at 70°C, vacuum dry at 70°C to remove water and set aside.

[0029] The negative electrode of the lithium-sulfur battery is a lithium foil with a thickness of 100 microns, and the positive electrode is prepared by the following method: 20 parts by mass of Super P carbon, 70 parts by mass of elemental sulfur, and 10 parts by mass of polyvinylidene fluoride (PVDF) in Blended in N-methylpyrrolidone (NMP), coated onto alumin...

Embodiment 2

[0032] Preparation of a composite membrane rich in nitrate ions: Soak 1g of chloromethyl polyethersulfone with a chloromethyl degree of 100mmol / g in 10% triethylamine aqueous solution at room temperature for 24 hours to obtain a quaternization degree of 100mmol / g g of quaternized polyethersulfone and cesium nitrate are mixed and dissolved in N-methylpyrrolidone (NMP) according to the mass ratio of 1:2 to form a film-forming solution with a concentration of 15%. The film-forming solution is cast to form a film. Naturally dry at 70°C, vacuum dry at 70°C to remove water and set aside.

[0033] The negative electrode of the lithium-sulfur battery is a lithium foil with a thickness of 100 microns, and the positive electrode is prepared by the following method: 20 parts by mass of Super P carbon, 70 parts by mass of elemental sulfur, and 10 parts by mass of polyvinylidene fluoride (PVDF) in Blended in N-methylpyrrolidone (NMP), coated onto aluminum foil. The sulfur content in the ...

Embodiment 3

[0036] Preparation of a composite membrane rich in nitrate ions: soak 3g of chloromethyl polyethersulfone with a chloromethyl degree of 30mmol / g in 10% triethylamine aqueous solution at room temperature for 24 hours to obtain a quaternization degree of 100mmol / g g quaternized polyethersulfone. Mix it with lithium nitrate at a mass ratio of 1:1 and dissolve in N,N-dimethylformamide (DMF) to prepare a film-forming solution with a concentration of 20wt.%. The film-forming solution is cast to form a film. Naturally dry at 70°C, vacuum dry at 70°C to remove water and set aside.

[0037]The negative electrode of the lithium-sulfur battery is a lithium foil with a thickness of 100 microns, and the positive electrode is prepared by the following method: 20 parts by mass of Super P carbon, 70 parts by mass of elemental sulfur, and 10 parts by mass of polyvinylidene fluoride (PVDF) in Blended in N-methylpyrrolidone (NMP), coated onto aluminum foil. The sulfur content in the positive ...

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Abstract

The invention relates to an application of a composite membrane in a lithium-sulfur battery. The composite membrane is prepared from one or more than two high-molecular polymers containing basic functional groups or one or more than two high-molecular polymers containing basic functional groups and other polymers which are blended to form a membrane-forming polymer, and one or more than two saltscontaining nitrate radicals, wherein the content of the high-molecular polymer containing the basic functional group in the film-forming polymer is 5-100wt%; the mass fraction of the salt containing nitrate radicals in the composite film is 0.1%-90%. The composite membrane is used in the lithium-sulfur battery, so nitrate radicals can be better utilized, the nitrate radicals are prevented from being rapidly and uncontrollably consumed, the use of the nitrate radicals is delayed, and the capacity retention ratio of the battery is further improved.

Description

technical field [0001] The invention relates to the field of lithium-sulfur batteries, in particular to the application of a membrane material in lithium-sulfur batteries. Background technique [0002] Lithium-sulfur battery because of its very high theoretical specific energy density (2600Wh.kg -1 ) and cheap, becoming a research hotspot for next-generation lithium batteries. Especially in the last ten years, with the development of cathode materials using mature nanotechnology, the process of practical lithium-sulfur batteries has been greatly promoted. [0003] But lithium-sulfur batteries have some inherent drawbacks. For example, the dissolution of discharge product polysulfides and shuttling between the positive and negative electrodes, and the irreversible deposition of lithium sulfide / lithium disulfide on the positive and negative electrodes are all obstacles to further improve the cycle stability of lithium-sulfur batteries. [0004] In order to solve the above p...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M10/052H01M10/42
CPCH01M10/052H01M10/4235H01M50/411Y02E60/10
Inventor 张洪章李先锋曲超张华民
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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