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Flame-retardant electrolyte for secondary lithium-sulfur battery and preparation method for flame-retardant electrolyte

A lithium-sulfur battery and electrolyte technology, applied in the field of secondary lithium-sulfur battery flame-retardant electrolyte and its preparation, can solve the problems of weakening battery safety, low boiling point, flammability, etc., and achieve improved cycle stability and rate Discharge capability, high-safety electrochemical performance, and the effect of improving electrochemical performance

Inactive Publication Date: 2016-09-28
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

First of all, most of the electrolytes of lithium-sulfur batteries now use ether organic solvents, such as 1,3-dioxolane and ethylene glycol dimethyl ether, and some use carbonate organic solvents, but the boiling points are low and flammable. , in the state of battery abuse, there is a danger of fire and explosion
Secondly, lithium-sulfur batteries use metal lithium as the negative electrode, and the reaction between it and organic solvents and the formation of lithium dendrites will affect the safety of the battery.
Finally, the cathode material is mostly composed of conductive carbon material and sulfur element, both of which are easy to burn, which weakens the safety of the battery

Method used

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  • Flame-retardant electrolyte for secondary lithium-sulfur battery and preparation method for flame-retardant electrolyte
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  • Flame-retardant electrolyte for secondary lithium-sulfur battery and preparation method for flame-retardant electrolyte

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Embodiment 1

[0029] In the glove box, ethylene carbonate and ethyl methyl carbonate were uniformly mixed at a volume ratio of 1:1, LiPF6 was added to the mixed solvent, and stirred evenly to prepare an electrolyte solution with a concentration of 1mol / L. Add flame retardant ethoxyl (pentafluoro) cyclotriphosphazene to this electrolyte solution again, obtain flame retardant electrolyte solution, described flame retardant accounts for the mass percentage content of total weight of electrolyte solution to be respectively 0.1%, 1%, 3%, 5%, 10%, 20%.

Embodiment 2

[0031] Mix fluoroethylene carbonate, propylene carbonate and ethylene glycol diethyl ether uniformly in the glove box at a volume ratio of 1:1:1, and add LiN(FSO 2 ) 2 and LiN(CF 3 SO 2 ) 2 , and stir evenly to make an electrolyte solution with a concentration of 0.5mol / L. Add flame retardant propoxyl (pentafluoro) cyclotriphosphazene to this electrolyte solution again, obtain flame retardant electrolyte solution, the mass percent content of described flame retardant accounting for electrolyte total weight is respectively 0.1%, 1%, 3%, 5%, 10%, 20%.

Embodiment 3

[0033] Mix dioxane and diethylene glycol diethyl ether uniformly in a volume ratio of 1:1 in the glove box, and add LiBC to the mixed solvent 2 o 4 f 2 , and stir evenly to make an electrolyte solution with a concentration of 5mol / L. Then add the flame retardant phenoxy (pentafluoro)cyclotriphosphazene to the electrolyte to obtain a flame retardant electrolyte, and the mass percentage of the flame retardant to the total weight of the electrolyte is 0.1%, 1%, and 3% respectively , 5%, 10%, 20%.

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Abstract

The invention relates to a flame-retardant electrolyte for a secondary lithium-sulfur battery and a preparation method for the flame-retardant electrolyte. The flame-retardant electrolyte comprises a lithium salt, an organic solvent and a fire retardant, wherein the concentration of the lithium salt is 0.5-5mol / L in the electrolyte; the fire retardant is phosphonitrile fluoride fire retardant, which accounts for 0.1-20% of the total flame-retardant electrolyte based on mass percentage; the lithium salt is added to the organic solvent to be uniformly stirred to prepare the electrolyte; and then the fire retardant is added to the electrolyte to be continuously stirred and uniformly mixed to obtain the flame-retardant electrolyte for the secondary lithium-sulfur battery. Compared with the prior art, the flammability of the electrolyte added with the phosphonitrile fluoride additive is greatly lowered, and the influence on the conductivity is relatively low; according to the secondary lithium-sulfur battery assembled by the electrolyte containing the phosphonitrile fluoride fire retardant, the electrochemical performance of the secondary lithium-sulfur battery is obviously improved, and an effect of giving consideration to both of the flame-retardant effect and the electrochemical performance can be achieved.

Description

technical field [0001] The invention relates to an electrolyte solution system for a secondary lithium-sulfur battery, in particular to a flame-retardant electrolyte solution for a secondary lithium-sulfur battery and a preparation method thereof. Background technique [0002] Conventional lithium-ion batteries are limited by the capacity of their cathode materials, and their energy density is low (about 150Wh kg-1), which cannot meet the needs of large electric vehicles, while rechargeable lithium-sulfur batteries have considerable theoretical energy density (2600Wh kg-1 1). However, the practical application of lithium-sulfur batteries also needs to consider the safety issues similar to those of traditional lithium-ion batteries. First of all, most of the electrolytes of lithium-sulfur batteries now use ether organic solvents, such as 1,3-dioxolane and ethylene glycol dimethyl ether, and some use carbonate organic solvents, but the boiling points are low and flammable. ,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/42H01M10/058
CPCH01M10/0567H01M10/058H01M10/4235H01M2300/0025Y02E60/10Y02P70/50
Inventor 王久林沈旺杨军努丽燕娜
Owner SHANGHAI JIAO TONG UNIV
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