Fluorine-containing ether electrolyte cosolvent for lithium metal/lithium ion/lithium sulfur battery, electrolyte and lithium secondary battery

A lithium-sulfur battery, fluorine-containing ether technology, applied in secondary batteries, secondary battery repair/maintenance, lithium batteries, etc., can solve problems such as poor stability and low oxidation decomposition potential, reduce flammability, and improve oxidation resistance. Potential, the effect of suppressing the growth of lithium dendrites

Inactive Publication Date: 2021-02-19
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The object of the present invention is to provide a fluorine-containing ether compound and its preparation method, a fluorine-containing ether electrolyte co-solvent for lithium metal / lithium ion / lithium sulfur battery, an electrolyte and a secondary The battery is designed to solve technical problems such as poor stability and low oxidative decomposition potential of the existing ester electrolyte and ether electrolyte

Method used

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  • Fluorine-containing ether electrolyte cosolvent for lithium metal/lithium ion/lithium sulfur battery, electrolyte and lithium secondary battery
  • Fluorine-containing ether electrolyte cosolvent for lithium metal/lithium ion/lithium sulfur battery, electrolyte and lithium secondary battery
  • Fluorine-containing ether electrolyte cosolvent for lithium metal/lithium ion/lithium sulfur battery, electrolyte and lithium secondary battery

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preparation example Construction

[0040] Correspondingly, the embodiment of the present invention also provides a preparation method of fluorine-containing ether compounds, which includes the following steps:

[0041] S1. Provide p-toluenesulfonyl chloride, fluoroalcohol and alkali metal hydroxide; mix p-toluenesulfonyl chloride, fluoroalcohol and alkali metal hydroxide, and p-toluenesulfonyl chloride and fluoroalcohol generate p-toluenesulfonate.

[0042] S2. Mixing the p-toluenesulfonate with fluoroalcohol and alkali metal hydroxide, the fluoroalcohol and the alkali metal hydroxide react to form a fluoroalcohol organic base, the fluoroalcohol organic base and the p-toluenesulfonate A bimolecular nucleophilic substitution reaction occurs to generate the fluorine-containing ether compound (named DFE);

[0043] The molecular structural formulas of fluorine-containing ether compounds are shown in formulas (I)-(VII):

[0044]

[0045]

[0046] In the preparation method of the fluorine-containing ether comp...

Embodiment 1

[0065] A preparation method for fluorine-containing ether compounds, comprising the steps of:

[0066] (1) Dissolve 0.214mol of 2,2-difluoroethanol (its molecular structure is shown in formula (i)) in 65mL of tetrahydrofuran, and add 65mL of 6M NaOH solution dropwise under ice-bath conditions to generate 2,2 -Sodium difluoroethanolate solution; then dissolve 0.22mol of p-toluenesulfonyl chloride in 50mL tetrahydrofuran, add the above-mentioned sodium 2,2-difluoroethoxide solution under ice bath and stirring conditions, and stir and react under ice bath conditions for 1 hour , rise to room temperature, continue to stir to make it fully react for 1.5 hours, then add 170mL of NaOH solution (1M) to convert excess p-toluenesulfonyl chloride into a water-soluble salt for easy removal; add 200mL of ether for extraction, and wash with ultrapure water Three times, under reduced pressure to spin off the ether to obtain 2,2-difluoroethyl p-toluenesulfonate;

[0067] (2) Dissolve 2,2-dif...

Embodiment 2

[0070] A preparation method for fluorine-containing ether compounds, comprising the steps of:

[0071] (1) Dissolve 0.214mol of 2-fluoroethanol (its molecular structure is shown in formula (ii)) in 65mL of tetrahydrofuran, and add 65mL of 6M NaOH solution dropwise under ice-bath conditions to generate sodium 2-fluoroethoxide solution ; Then 0.25mol of p-toluenesulfonyl chloride was dissolved in 50mL of tetrahydrofuran, and added to the above-mentioned sodium 2-fluoroethoxide solution under ice bath and stirring conditions, stirred and reacted for 1.5 hours under ice bath conditions, rose to room temperature, and continued to stir to make it Fully react for 2 hours, then add 170mL of NaOH solution (1M) to convert the excess p-toluenesulfonyl chloride into a water-soluble salt for easy removal; then add 200mL of ether for extraction, wash with ultrapure water three times, and spin off the ether under reduced pressure to obtain 2-fluoroethyl p-toluenesulfonate;

[0072] (2) Diss...

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Abstract

The invention discloses a fluorine-containing ether electrolyte cosolvent for a lithium metal / lithium ion / lithium sulfur battery, an electrolyte and a lithium secondary battery. The electrolyte cosolvent provided by the invention comprises a fluorine-containing ether compound, the molecular structural formula of the fluorine-containing ether compound is shown as formulas (I) to (VI), and the fluorine-containing ether compound has the advantages of wide electrochemical stability window, stability to lithium metal and the like, and is used for preparing a lithium secondary battery, so that the capacity retention ratio and the cycling stability of the obtained lithium secondary battery can be remarkably improved, and the fluorine-containing ether compound has better application prospect in the field of lithium batteries.

Description

technical field [0001] The invention belongs to the technical field of battery materials, and in particular relates to a fluorine-containing ether electrolyte co-solvent for lithium metal / lithium ion / lithium sulfur batteries, an electrolyte and a lithium secondary battery. Background technique [0002] Electrolyte is known as the "blood" in lithium batteries, and it plays a vital role in the capacity of lithium battery electrode materials, battery cycle stability, and battery safety. The electrolyte used in traditional lithium-ion batteries is generally ethylene carbonate (EC), ethyl methyl carbonate (EMC), dimethyl carbonate (DMC), diethyl carbonate (DEC), etc. as the main solvent, and lithium hexafluorophosphate is lithium salt. An electrolyte solution prepared by adding a certain amount of additives. Since this type of electrolyte can form a relatively stable solid electrolyte film (SEI) on the graphite negative electrode, it can protect the graphite negative electrode f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0569H01M10/42H01M10/052H01M10/0525C07C41/16C07C43/12C07C29/70C07C31/38C07C303/28C07C309/73
CPCH01M10/0569H01M10/4235H01M10/052H01M10/0525C07C41/16C07C29/70C07C303/28H01M2300/0034C07C309/73C07C31/38C07C43/123Y02E60/10
Inventor 王朝阳邓晓岚张光照邓永红
Owner SOUTH CHINA UNIV OF TECH
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