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Electrolyte used for lithium-sulfur battery and preparation method of electrolyte

A lithium-sulfur battery and electrolyte technology, applied in the field of electrochemistry, can solve the problems of the influence of cycle efficiency battery cycle life, limited lithium-sulfur battery cycle life, low lithium cycle efficiency, etc., to achieve excellent electrochemical performance, no self-discharge, Superior magnification performance

Inactive Publication Date: 2017-10-31
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this electrolyte, the metal lithium negative electrode is prone to lithium dendrites, and the lithium cycle efficiency is mostly lower than 98%, and there is a shuttle reaction of polysulfide ions in the elemental sulfur composite positive electrode.
These factors limit the cycle life of lithium-sulfur batteries
The developed sulfurized polyacrylonitrile composite positive electrode material can prevent the shuttle reaction of polysulfide ions, but in the carbonate electrolyte, the lithium dendrite precipitation and low cycle efficiency of the lithium negative electrode greatly affect the cycle life of the battery

Method used

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  • Electrolyte used for lithium-sulfur battery and preparation method of electrolyte
  • Electrolyte used for lithium-sulfur battery and preparation method of electrolyte
  • Electrolyte used for lithium-sulfur battery and preparation method of electrolyte

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Mix EC, DMC, and FEC evenly in a glove box at a volume ratio of 4.5:4.5:1, and stir for 30 minutes. Add LiODFB to the mixed solvent, stir to dissolve completely, and continue stirring for 12 hours to make a 1.0mol / L electrolyte. The room temperature ionic conductivity of the electrolyte obtained in the present embodiment is 7.2mS / cm; the cyclic voltammogram of the electrolyte obtained in the present embodiment is as follows figure 1 As shown, a platinum disk electrode with a diameter of 2mm was used as the working electrode, and a lithium metal sheet was used as the counter electrode and reference electrode. The scanning speed was 5mV / s, and its electrochemical window was greater than 5.5V.

Embodiment 2

[0026] In the same way as in Example 1, 1mol / L LiODFB / EC-DMC-FEC (v:v:v=4:4:2) was prepared, and the room temperature ionic conductivity of the electrolyte prepared in this example was 7.1mS / cm; The electrochemical window of the electrolyte obtained in this embodiment is greater than 5.5V.

Embodiment 3

[0028] In the same way as described in Example 1, 1mol / L LiODFB / EC-DEC-FEC (v:v:v=4.5:4.5:1) was prepared, and the room temperature ionic conductivity of the electrolyte prepared in this example was 7.18mS / cm; The electrochemical window of the electrolyte obtained in this embodiment is greater than 5.5V.

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Abstract

The invention provides an electrolyte used for a lithium-sulfur battery and a preparation method of the electrolyte. The electrolyte comprises lithium salt, solvent and cosolvent, wherein the lithium salt is one or two kinds of lithium difluoro(oxalato)borate or lithium difluoro-malonate borate; the solvent is at least one kind of propylene carbonate, ethylene carbonate, dimethyl carbonate, diethyl carbonate or methyl ethyl carbonate; and the cosolvent is one or two kinds of fluoroethylene carbonate and vinylene carbonate. The preparation method of the electrolyte comprises the following steps of performing uniform mixing on the solvent and the cosolvent to form a mixed solvent; and adding lithium salt to the mixed solvent to be mixed uniformly to obtain the electrolyte. The electrolyte, by adopting the most basic lithium battery electrolyte raw materials, is rich in source, simple in preparation process, free of a stabilizer, suitable for industrial production and has excellent electrochemical performance.

Description

technical field [0001] The invention relates to an electrolyte solution for a lithium-sulfur battery and a preparation method thereof, belonging to the field of electrochemistry. Background technique [0002] With the increasing urgency of energy demand in modern society, secondary batteries with high energy density have become the focus of future energy industry development. Lithium-ion batteries have become the most commonly used secondary batteries due to their outstanding performance advantages. The commonly used negative electrode material for batteries is graphitized carbon, and its theoretical specific capacity is 370mAh / g, which is only about one-tenth of that of metal lithium, which cannot meet the growing demand for high energy density. More and more advantages have become the hot spot and development direction of people's research, such as lithium-sulfur batteries and lithium-air batteries, if the final product Li is reduced according to the reduction 2 According...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0566H01M10/0569
CPCH01M10/0566H01M10/0569Y02E60/10
Inventor 杨军许志新王久林努丽燕娜
Owner SHANGHAI JIAO TONG UNIV
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