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A lithium-sulfur battery with self-temperature control function

A lithium-sulfur battery and self-temperature control technology, which is applied to lithium batteries, secondary batteries, battery components, etc., can solve the problems of complex manufacturing process and high price, increase safety and service life, and improve utilization rate , to avoid the effect of discharge capacity drop

Active Publication Date: 2020-03-10
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

This method is complex and expensive

Method used

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  • A lithium-sulfur battery with self-temperature control function
  • A lithium-sulfur battery with self-temperature control function

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Calcium chloride, strontium chloride, sodium chloride, acrylic acid, glycerol, hydroxyethyl methacrylate, maleic anhydride, sodium hydroxymethyl cellulose, and silicon dioxide are: 31%, 11.5% by mass , 6%, 3%, 5%, 4%, 3.5%, 2.5%, 33.5% mixed in proportion, put into water (mass solid content 30%), mix and stir at 60°C for 3h, let stand for 0.5h, vacuum at 65°C After drying, take 0.1g of the mixture and disperse it in 1.3g of N-methylpyrrolidone (NMP). After the dispersion is uniform, ultrasonication is performed for 20 minutes, stirred for 1 hour, and 0.132g of 10wt% polyvinylidene fluoride (PVDF) solution is added. The solvent is NMP. Stir for 5h, adjust the scraper to 200μm, and the coating amount is 1mg / cm 2 Scratch coating on a polypropylene film to form a film, dry overnight at 70°C, cut into small discs with a diameter of 19mm, and use it as a separator for a self-temperature-controlling battery. See figure 2 .

[0028] It can be seen from the results that unde...

Embodiment 2

[0030] Calcium chloride, strontium chloride, sodium chloride, acrylic acid, glycerol, hydroxyethyl methacrylate, maleic anhydride, sodium hydroxymethyl cellulose, and silicon dioxide are 30% and 11% by mass , 5%, 1%, 10%, 6%, 4%, 3%, 30% mixed in proportion, put into water (solid content 40%), mix and stir at 80°C for 3h, let stand for 0.5h, and vacuum dry at 65°C Finally, take 0.1g of the mixture and disperse it in 1.3g of N-methylpyrrolidone (NMP). After the dispersion is even, ultrasonicate for 20min, stir for 1h, add 0.132g of 10wt% polyvinylidene fluoride (PVDF) solution, the solvent is NMP, and stir for 5h , adjust the scraper to 1000μm, and the coating amount is 20mg / cm 2 Scratch coating on a polypropylene film to form a film, dry overnight at 70°C, and cut into small discs with a diameter of 19mm as a separator for a self-temperature-controlling battery.

Embodiment 3

[0032] Calcium chloride, strontium chloride, sodium chloride, acrylic acid, glycerol, hydroxyethyl methacrylate, maleic anhydride, sodium hydroxymethyl cellulose, and silicon dioxide are: 35%, 12% by mass , 7%, 5%, 10%, 2%, 3%, 2%, 24% mixed in proportion, put into water (solid content 15%), mix and stir at 45°C for 3h, let stand for 0.5h, and vacuum dry at 65°C Finally, take 0.1g of the mixture and disperse it in 1.3g of N-methylpyrrolidone (NMP). After the dispersion is even, ultrasonicate for 20min, stir for 1h, add 0.132g of 10wt% polyvinylidene fluoride (PVDF) solution, the solvent is NMP, and stir for 5h , adjust the scraper to 500μm, and the coating amount is 10mg / cm 2 Scratch coating on a polypropylene film to form a film, dry overnight at 70°C, and cut into small discs with a diameter of 19mm as a separator for a self-temperature-controlling battery.

[0033] Depend on figure 1It can be seen from the results that when the ambient temperature is 40°C, the self-temper...

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Abstract

The invention relates to a lithium-sulfur battery with a self-temperature-regulating function, which includes a positive electrode, a separator, and a negative electrode arranged in sequence, and the surface of the separator near the positive electrode is coated with a phase-change constant temperature material layer to form a separator capable of realizing the self-temperature control function of the battery . Through the implementation of the present invention, the concept of using the temperature-regulating diaphragm to control the temperature of the battery is realized, the safety and service life of the lithium-sulfur battery are increased, the temperature range of the battery application environment is expanded, and the battery has a good application prospect.

Description

technical field [0001] The invention relates to the technical field of lithium-sulfur batteries. Background technique [0002] Lithium-sulfur battery, as a new electrochemical energy storage secondary battery, is different from the traditional lithium ion "deintercalation" material. During the discharge process, sulfur and metal lithium undergo a two-electron reaction, which can release a high specific capacity. (1675mAh g -1 ), the theoretical specific energy is also as high as 2600Wh kg -1 , At the same time, the active substance sulfur has the advantages of high natural abundance, low cost, low toxicity, and environmental friendliness. Therefore, lithium-sulfur batteries are considered to be one of the new secondary batteries that can replace lithium-ion batteries and have good application prospects. [0003] However, in the environment in which lithium-sulfur batteries are used, temperature has the greatest impact on the charge-discharge performance of lithium-sulfur b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/615H01M10/635H01M10/659H01M2/16H01M10/052H01M50/446
CPCH01M10/052H01M10/615H01M10/635H01M10/659H01M50/446Y02E60/10
Inventor 王美日张华民张洪章李先锋
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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