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Lithium-sulfur battery electrolyte, preparation method thereof and lithium-sulfur battery

A lithium-sulfur battery and electrolyte technology, applied in the field of electrochemistry, can solve the problems of solvents increasing the cost of electrolyte use, poor universality, etc., and achieve the effects of solving flammable problems, high chemical stability, and reducing release

Active Publication Date: 2015-12-16
JIANGSU HUADONG INST OF LI ION BATTERY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the method of additives cannot fundamentally solve the flammability problem of the electrolyte, and the fluorination of the solvent also greatly increases the use cost of the electrolyte, and the universality is not strong

Method used

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  • Lithium-sulfur battery electrolyte, preparation method thereof and lithium-sulfur battery
  • Lithium-sulfur battery electrolyte, preparation method thereof and lithium-sulfur battery
  • Lithium-sulfur battery electrolyte, preparation method thereof and lithium-sulfur battery

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preparation example Construction

[0032] The embodiment of the present invention provides a method for preparing a lithium-sulfur battery electrolyte, which includes the following steps:

[0033] S1, reacting sodium metal or sodium hydride with the first fluorine-containing alcohol and the second fluorine-containing alcohol in an organic solvent to generate a first fluorine-containing sodium alkoxide solution and a second fluorine-containing sodium alkoxide solution;

[0034] S2: Dissolve hexachlorocyclotriphosphazene in an organic solvent to form a hexachlorocyclotriphosphazene solution, first add the first sodium fluoroalkoxide solution dropwise to the hexachlorocyclotriphosphazene solution, and at room temperature after the addition is complete After 6 hours to 12 hours of reaction, the second fluorine-containing sodium alkoxide solution is added dropwise, and after the addition is completed, the temperature is raised to 45°C~55°C and reacted for 6 hours to 12 hours to obtain a milky white turbid liquid;

[0035] ...

Embodiment 1

[0047] (1) After 30 minutes of nitrogen flow in a three-necked flask equipped with a condensing device, weigh a certain amount of metallic sodium particles into the three-necked flask, add an appropriate amount of tetrahydrofuran, stir and disperse with a magnetic stirrer to form a dispersion; Take the octafluoropentanol in excess relative to the sodium metal, dilute it with an appropriate amount of tetrahydrofuran, and place it in a constant pressure funnel and slowly drop it into the above dispersion; after the addition, react for a period of time until the mixture is transparent. The first sodium fluoroalkoxide solution;

[0048] Take another three-necked flask equipped with a condensing device. After blowing nitrogen for 30 minutes, weigh a certain amount of metallic sodium particles into the three-necked flask, add an appropriate amount of tetrahydrofuran, and stir and disperse with a magnetic stirrer to form a dispersion; Excess trifluoromethanol relative to sodium metal, d...

Embodiment 2

[0055] Same as Example 1, except in step (6), the phosphazene compound accounts for 30% by mass to form a mixed solvent, and LiPF is added to the mixed solvent 6 , Stir and dissolve to prepare an electrolyte with a concentration of 1mol / L.

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Abstract

The invention provides a lithium-sulfur battery electrolyte. The lithium-sulfur battery electrolyte is prepared from carbonic ester organic solvent, lithium salt and flame-retardant co-solvent. The flame-retardant co-solvent is a phosphonitrile compound, and the mass fraction of the flame-retardant co-solvent is 20%-50%. The concentration of the lithium salt is 0.8 mol / L-1.2 mol / L. The invention further relates to a preparation method of the lithium-sulfur battery electrolyte and a lithium-sulfur battery.

Description

Technical field [0001] The invention belongs to the field of electrochemistry technology, and particularly relates to a lithium-sulfur battery electrolyte and a preparation method thereof, and a lithium-sulfur battery. Background technique [0002] Lithium-sulfur battery is a kind of lithium battery with sulfur element as the battery positive electrode and metal lithium as the negative electrode. According to the unit mass of elemental sulfur completely changed to S 2- From the amount of electricity that can be provided, the theoretical discharge mass specific capacity of sulfur is 1675mAh / g, and the theoretical energy density is about 2600Wh·kg. -1 , Much higher than conventional lithium-ion batteries widely used commercially (energy density of about 150Wh·kg -1 ). In addition, sulfur is cheap and has no pollution to the environment. It is expected to become a secondary battery with high energy density and long life in the future. [0003] However, many problems need to be solved...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0568H01M10/42H01M10/052C07F9/6593
CPCH01M10/052H01M10/0567H01M10/0568H01M10/4235H01M4/38H01M4/382H01M10/0569H01M10/058H01M2300/0028Y02E60/10H01M10/0525H01M2004/028H01M2300/0037
Inventor 刘榛尚玉明何向明王莉李建军王要武高剑赵鹏
Owner JIANGSU HUADONG INST OF LI ION BATTERY