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A kind of double cation liquid electrolyte and its preparation and application

A double cation and ion exchange reaction technology, applied in the field of lithium-sulfur battery electrolyte additives, can solve problems such as the reduction of battery coulombic efficiency, and achieve the effects of improving coulombic efficiency and cycle stability, inhibiting capacity loss, and inhibiting low coulombic efficiency.

Active Publication Date: 2021-04-30
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its specific performance is: during the charging and discharging process, the discharge intermediate product lithium polysulfide on the positive electrode side can pass through the diaphragm, shuttle to the negative electrode side of the battery, and be reduced to lithium sulfide or short-chain polysulfide lithium on the surface of the lithium negative electrode. The adhesion of lithium sulfide to the surface of the negative electrode will cause corrosion of lithium metal and irreversible attenuation of capacity, and the short-chain polysulfide lithium produced can shuttle back to the positive electrode and be oxidized again, resulting in a decrease in the coulombic efficiency of the battery.

Method used

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  • A kind of double cation liquid electrolyte and its preparation and application
  • A kind of double cation liquid electrolyte and its preparation and application
  • A kind of double cation liquid electrolyte and its preparation and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Weigh 3.3g of N-methylimidazole and 5.0g of 1,6-dibromohexane in a 100mL flask, reflux at 70°C for 5h, add 10mL of deionized water after the temperature drops to room temperature, and filter to obtain the filtrate in a vacuum oven for 120 After drying at ℃ for 48 hours, the white powder was obtained as dication bromide salt with a yield of 98%. Weigh 2.0 g of the obtained dicationic bromide salt and 2.9 g of LiTFSI and dissolve them in 20 mL of deionized water respectively, mix the two solutions slowly, phase separation occurs in the water, use a separatory funnel to obtain the lower liquid, and wash it with deionized water for 3 times , a colorless dianionic liquid was obtained with a yield of 99%.

[0040] The diionic liquid was added to the electrolyte solution in Comparative Example 1, and the mass fraction was 2%. The positive electrode was prepared according to the method of Comparative Example 1, the electrolyte solution containing 2wt.% diionic liquid was selec...

Embodiment 2

[0042]According to the method of Example 1, the dicationic liquid was prepared. The diionic liquid was added to the electrolyte solution in Comparative Example 1, and the mass fraction was 5%. The positive electrode was prepared according to the method of Comparative Example 1, the electrolyte solution containing 5wt.% diionic liquid was selected, and the CR2016 button battery was assembled, and the cycle performance charge and discharge test was carried out at a rate of 0.2C.

Embodiment 3

[0044] According to the method of Example 1, the dicationic liquid was prepared. The diionic liquid was added to the electrolyte solution in Comparative Example 1, and the mass fraction was 10%. The positive electrode was prepared according to the method of Comparative Example 1, the electrolyte solution containing 10wt.% diionic liquid was selected, and the CR2016 button battery was assembled, and the cycle performance charge and discharge test was carried out at a rate of 0.2C.

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Abstract

The invention relates to a dication liquid electrolyte and its preparation and application. The dication uses nitrogen-containing aromatic compounds, halogenated compounds and lithium salts as raw materials, and is a dication liquid prepared by substitution reaction and ion exchange reaction; In lithium-sulfur batteries, it has the effect of inhibiting the shuttle effect, and at the same time, it can inhibit the corrosion of polysulfide ions on lithium negative electrodes and the growth of lithium dendrites. Through the synergistic effect of anions and cations, the cycle life of lithium-sulfur batteries can be effectively improved, and it has a good application prospect .

Description

technical field [0001] The invention relates to a novel lithium-sulfur battery electrolyte additive. Background technique [0002] With the increasing depletion of fossil resources, increasing ecological pollution, and the emergence of global warming, secondary batteries have become a hot spot of common concern in academia and industry to replace traditional fossil fuel-driven vehicles and other power equipment. Among commercialized secondary batteries, lithium-ion batteries are currently the secondary batteries with the highest energy density, but the theoretical specific capacity of lithium-ion batteries based on the "deintercalation" theory is currently less than 400mA h g -1 , the actual energy density is less than 300Wh kg -1 , It is far from meeting people's demand for 500km battery life of electric vehicles. Lithium-sulfur batteries have a high theoretical specific capacity (~1675mA h g -1 ) and energy density (~2500W h kg -1 ), and as an active material, sulfur a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0567H01M10/052C07D213/22C07D213/127C07D233/58
CPCY02E60/10
Inventor 张华民陈雨晴张洪章李先锋于滢贾子阳
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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