Carbonic ester-based electrolyte with ether oxygen bond functional group and application of carbonic ester-based electrolyte

A carbonate-based, electrolyte technology, applied in the field of lithium-ion batteries, can solve the problems of not meeting the safety requirements of energy storage devices, limiting practical applications, ether solvents with low boiling point and flash point, and achieving shortened self-extinguishing time, Improved Coulombic efficiency, cycle life, and high flash point

Pending Publication Date: 2022-04-29
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the oxidation stability of ether solvents (+ ) is lower than that of carbonate solvents, which greatly limits their practical application, and the boiling point and flash point of ether solvents are generally low, which cannot meet the safety requirements of next-generation energy storage devices

Method used

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  • Carbonic ester-based electrolyte with ether oxygen bond functional group and application of carbonic ester-based electrolyte
  • Carbonic ester-based electrolyte with ether oxygen bond functional group and application of carbonic ester-based electrolyte
  • Carbonic ester-based electrolyte with ether oxygen bond functional group and application of carbonic ester-based electrolyte

Examples

Experimental program
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Effect test

Embodiment 1

[0036] (1) In a glove box filled with argon (H 2 O2 Molecular sieves remove water from solvents. At room temperature at 25°C, dissolve lithium bisfluorosulfonyl imide (LiFSI) as a single lithium salt in the solvent at a concentration of 1 mol / L, and stir evenly to obtain the basic electrolyte containing compound 1 provided by the present invention .

[0037] (2) Add lithium nitrate (LiNO 3 ) additive to obtain the electrolyte solution of Example 1 containing Compound 1 provided by the present invention. Among them, lithium nitrate (LiNO 3 ) is added in an amount of 1% of the total mass of the electrolyte.

Embodiment 2

[0039] (1) In a glove box filled with argon (H 2 O2 Molecular sieves remove water from solvents. At room temperature at 25°C, dissolve lithium bisfluorosulfonyl imide (LiFSI) as a single lithium salt in the solvent at a concentration of 1 mol / L, and stir evenly to obtain the basic electrolyte containing compound 1 provided by the present invention .

[0040] (2) Add lithium difluorobisoxalate phosphate (LiDFBOP) additive to the basic electrolyte prepared in step (1) to obtain the electrolyte of Example 2 containing compound 1 provided by the present invention. Wherein, the added amount of lithium difluorobisoxalate phosphate (LiDFBOP) accounts for 1% of the total mass of the electrolyte.

Embodiment 3

[0042] (1) In a glove box filled with argon (H 2 O2 Molecular sieves remove water from solvents. At room temperature at 25°C, dissolve lithium bisfluorosulfonyl imide (LiFSI) as a single lithium salt in the solvent at a concentration of 1 mol / L, and stir evenly to obtain the basic electrolyte containing compound 1 provided by the present invention .

[0043] (2) Add lithium nitrate (LiNO 3 ) and lithium difluorobisoxalate phosphate (LiDFBOP) additive to obtain the electrolyte solution of Example 3 containing compound 1 provided by the present invention. Among them, lithium nitrate (LiNO 3 ) and lithium difluorobisoxalate phosphate (LiDFBOP) both accounted for 1% of the total mass of the electrolyte.

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Abstract

The invention belongs to the technical field of batteries, and particularly relates to a carbonic ester-based electrolyte with an ether oxygen bond functional group and application of the carbonic ester-based electrolyte. The carbonic ester-based electrolyte with the ether oxygen bond functional group comprises a carbonic ester solvent, a lithium salt and an additive, wherein the molecular structure of the carbonic ester solvent contains an ether oxygen bond. The electrolyte has a high boiling point and a high flash point, the high-temperature performance of the battery can be improved, the self-extinguishing time of the electrolyte is shortened, and the safety of the battery is further improved. In addition, the electrolyte has good compatibility with a traditional graphite negative electrode, solvent co-intercalation does not occur, and it is guaranteed that the lithium ion battery has excellent cycle stability. Moreover, the electrolyte has excellent interface stability with the metal lithium, and the dissolution-deposition efficiency of the metal lithium can be greatly improved, so that the cycle life of the lithium metal battery is prolonged. The carbonic ester-based electrolyte has a good application prospect in the fields of lithium ion batteries and lithium metal batteries.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a carbonate-based electrolyte with ether oxygen bond functional groups and its application in lithium ion batteries and lithium metal batteries. Background technique [0002] Since it was commercialized by Sony in 1991, lithium-ion batteries have been widely used in portable electronic devices (such as mobile phones, notebook computers, digital cameras, etc.) ) and new energy electric vehicles and other fields. However, under the background of "carbon peaking" and "carbon neutrality", the public's requirements for the safety and energy density of energy storage devices are also increasing. [0003] In terms of safety, the traditional short-chain carbonate-based electrolytes used in commercial lithium-ion batteries at this stage face the problem of low flash point and boiling point. Among them, the low flash point of the electrolyte is easy to catch fir...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0569H01M10/0567H01M10/0525H01M10/052H01M10/42
CPCH01M10/0569H01M10/0525H01M10/052H01M10/4235H01M10/0567
Inventor 董晓丽陈嘉威徐杰夏永姚
Owner FUDAN UNIV
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