An electrolyte containing a cathode protector and a lithium sulfur battery containing the electrolyte

A lithium-sulfur battery and protective agent technology, applied in non-aqueous electrolyte batteries, lithium batteries, battery electrodes, etc., to achieve the effects of easy large-scale amplification, low cost, improved reversibility and cycle stability

Inactive Publication Date: 2019-01-18
YANTAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Adding the positive electrode protective agent to the electrolyte for lithium-sulfur batteries can alleviate the problem of poor cycle life of lithium-sulfur batteries, increase the discharge rate of the battery, and at the same time form an electrolyte surface film on the surface of the positive electrode to improve the safety of the battery

Method used

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  • An electrolyte containing a cathode protector and a lithium sulfur battery containing the electrolyte
  • An electrolyte containing a cathode protector and a lithium sulfur battery containing the electrolyte
  • An electrolyte containing a cathode protector and a lithium sulfur battery containing the electrolyte

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] 99.5% pure (water content is 20ppm) is dissolved in the diethylene glycol dimethyl ether and makes the solution that concentration is 10%, then presses the addition amount of 0.5% The solution is injected into the standard electrolyte of the lithium-sulfur battery to prepare the electrolyte A for protection of the present invention.

[0046] The benchmark electrolyte for lithium-sulfur batteries is: 1M lithium bis(trifluoromethylsulfonyl)imide solution (LiTFSI) as the electrolyte solution, and the solvents are 1,3-dioxolane (DOL) and diethylene glycol dimethyl ether (DME) mixture (volume ratio v / v=1:1).

[0047] After uniformly mixing 20mg of commercialized Super P and 80mg of S, disperse in 1.3g of N-methylpyrrolidone (NMP), after uniform dispersion, add 24.7mg of commercialized KB carbon powder, after ultrasonication for 20min, stir for 1h, add 0.132g10wt .% polyvinylidene fluoride (PVDF) solution, the solvent is NMP, stir for 5h, adjust the scraper to 200μm, scrape...

Embodiment 2

[0058] The purity of 99.8% (water content is 200ppm) is dissolved in dimethyl sulfoxide to make a solution with a concentration of 5%, and then its solution is injected into the lithium-sulfur battery reference electrolyte in an amount of 3% to prepare the protection of the present invention. Electrolyte A.

[0059] The standard electrolyte for lithium-sulfur batteries is: 1M lithium bis(trifluoromethylsulfonyl)imide solution (LiTFSI) is the electrolyte solution, and the solvent is dimethyl sulfoxide.

[0060] After uniformly mixing 20mg of commercial Super P and 80mg of S, disperse in 1.3g of N-methylpyrrolidone (NMP). 10wt.% polyvinylidene fluoride (PVDF) solution, the solvent is NMP, stir for 5 hours, adjust the scraper to 200 μm, scrape and coat on the aluminum film to form a film, dry it overnight at 70 ° C, and cut it into small discs with a diameter of 14 mm. After weighing, after vacuum drying at 60°C for 24 hours, the small disc was used as the positive electrode (...

Embodiment 3

[0066] 99% pure (water content is 50ppm) is dissolved in the tetraglyme, makes the solution that concentration is 5%, then adds this solution by 0.1% addition amount in the standard electrolyte of lithium-sulfur battery, prepares the application of the present invention Protected electrolyte A.

[0067] The reference electrolyte for lithium-sulfur batteries is: 1M lithium hexafluorophosphate solution (LiPF 6 ) is an electrolyte solution, and the solvent is a mixture of dimethyl carbonate and ethylene glycol dimethyl ether (DME) (volume ratio v / v=1:1).

[0068] After uniformly mixing 20mg of commercial Super P and 80mg of S, disperse in 1.3g of N-methylpyrrolidone (NMP). 10wt.% polyvinylidene fluoride (PVDF) solution, the solvent is NMP, stir for 5 hours, adjust the scraper to 200 μm, scrape and coat on the aluminum film to form a film, dry it overnight at 70 ° C, and cut it into small discs with a diameter of 14 mm. After weighing, after vacuum drying at 60°C for 24 hours,...

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Abstract

The invention discloses an electrolyte containing a positive electrode protecting agent and a lithium sulfur battery containing the electrolyte. The purpose of the positive electrode protecting agentused in the lithium sulfur battery is to solve the problems of poor cycle stability, poor discharge rate and poor safety performance existing in the prior lithium sulfur battery. The technical schemeis that a positive electrode protecting agent is added into the traditional electrolyte of the lithium-sulfur battery as the electrolyte of the lithium-sulfur battery. In the charge and discharge process of the battery, the protectant is combined with S-S bond bonding, which lowers the activation energy of S-S bond cleavage/binding, accelerates the rate of redox reaction, thus alleviating the shuttle effect of lithium polysulfide and improving the reversibility and cycling stability of active sulfur.

Description

technical field [0001] The invention belongs to the technical field of lithium-sulfur batteries, and in particular relates to a protective agent for positive electrodes of lithium-sulfur batteries. Background technique [0002] In recent years, with the decline of oil production and the intensification of global environmental pollution, countries around the world have generally recognized that clean and pollution-free electric vehicles to replace fuel vehicles is an inevitable choice for a country's sustainable development. The power battery technology with high specific capacity has become the key to the development of pure electric vehicles. At the same time, the rapid development of communication technology, space technology, and national defense industry has greatly promoted the demand for small-volume, high-capacity rechargeable batteries. At present, among the commercialized secondary batteries, the lithium-ion battery is currently the secondary battery with the highe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M10/052
CPCH01M4/62H01M10/052Y02E60/10
Inventor 王美日李婧崔洪涛刘媛媛任万忠
Owner YANTAI UNIV
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