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Lithium-sulfur battery cathode, electrolyte and lithium-sulfur battery

A lithium-sulfur battery and electrolyte technology, applied in non-aqueous electrolyte batteries, battery electrodes, lithium batteries, etc., to achieve long cycle life, high power density, and electrochemical activity inhibition effects

Active Publication Date: 2016-02-10
SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above added additives that play a coating role inhibit the loss of active sulfur during charge and discharge and improve the cycle performance of the battery, it is still necessary to further improve the utilization efficiency and electrochemical activity of sulfur.

Method used

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  • Lithium-sulfur battery cathode, electrolyte and lithium-sulfur battery
  • Lithium-sulfur battery cathode, electrolyte and lithium-sulfur battery
  • Lithium-sulfur battery cathode, electrolyte and lithium-sulfur battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] Add 4-methacrylic acid-2,2,6,6-tetramethylpiperidinate monomer and azobisisobutyronitrile successively into acetic acid solvent, heat at 70°C and keep stirring, react in nitrogen atmosphere for 12 hours . After the reaction, the reaction solution was poured into ether solvent and stirred, and then filtered to obtain poly(4-methacrylic acid-2,2,6,6-tetramethylpiperidinate) (PMTMP).

[0062] Take an appropriate amount of PMTMP and dissolve it in methanol, add sodium tungstate and ethylenediaminetetraacetic acid, stir to dissolve, add hydrogen peroxide and deionized water, heat at 60°C and keep stirring for 48 hours. After the reaction was completed, the solid product was obtained by filtration, and washed several times with deionized water and ether, and the obtained orange solid was poly(4-methacrylic acid-2,2,6,6-tetramethylpiperidine-1-nitrogen free radical ester) (PTMA).

Embodiment 2

[0064] Add 1,5-dichloroanthraquinone and anhydrous sodium sulfide into N-methylpyrrolidone (NMP) solvent, heat to reflux and keep stirring, and react for 24 hours. After the reaction solution was cooled, it was centrifuged to obtain a solid product, which was washed with deionized water and acetone several times, and then dried at 120° C. for 12 hours. The obtained solid was poly(anthraquinone sulfide) (PAQS).

Embodiment 3

[0066] Add 1,4,5,8-naphthalene tetracarboxylic anhydride and ethylenediamine into the NMP solvent, heat to reflux and keep stirring, and react for 4 hours. After the reaction solution was cooled, it was centrifuged to obtain a solid product, which was washed with NMP and acetone several times, dried at 120°C for 12 hours, and reacted at 300°C in an argon atmosphere for 8 hours, and the obtained solid was polyimide (PI) .

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Abstract

The invention discloses a lithium-sulfur battery cathode, an electrolyte and a lithium-sulfur battery. The lithium-sulfur battery comprises a lithium-containing anode active layer, a cathode active layer containing a sulfur electrochemical active substance, the electrolyte disposed between the cathode active layer and the anode active layer, and an electron migration mediator formed in the cathode active layer and / or the electrolyte. The electron migration mediator is defined as a polymer which is at the interval of the cathode active substance reduction potential and the anode active substance oxidation potential and possesses the reversible redox electrochemical activity. The cathode or the electrolyte employs the electron migration mediator which is capable of improving sulfur utilization rate and elelctrochemcial activity and inhibiting sulfur loss. The lithium-sulfur battery employing the cathode or the electrolyte possesses high energy density, high power density and long cycle life. Additionally, the employed electron migration mediator cannot reach the anode through diffusion, migration and convection.

Description

technical field [0001] The application belongs to the field of energy batteries, and in particular relates to a positive electrode of a lithium-sulfur battery, an electrolyte and a lithium-sulfur battery. Background technique [0002] With the development of the economy, energy and environmental problems are becoming more and more serious. In order to improve energy utilization efficiency and reduce environmental pollution, a commonly used solution is to develop high-capacity secondary batteries. Lithium-ion batteries are currently one of the most widely used secondary batteries for energy storage. Their main advantage is their energy density, which is much higher than that of traditional secondary batteries. However, the safety and raw material costs of lithium-ion batteries are worrying. question. Therefore, the development of secondary batteries with higher energy density has always been a focus of attention. With the breakthrough of technical difficulties, lithium-sulfu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/052H01M4/62H01M10/0567
CPCY02E60/10
Inventor 陈宏伟王长虹葛军卢威陈立桅
Owner SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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