Electrolyte and preparation method and application thereof

An electrolyte and electrolyte technology, applied in the manufacture of electrolyte batteries, organic electrolytes, non-aqueous electrolytes, etc., can solve the problems of poor cycle performance, poor safety, low Coulomb efficiency, etc., to improve cycle life, inhibit dendrite growth, improve Effects of Coulombic Efficiency

Pending Publication Date: 2022-02-15
EVE ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The electrolyte described in the above scheme has the problems of low coulombic efficiency, poor safety, or poor cycle performance. Therefore, it is urgent to develop an electrolyte to improve the coulombic efficiency, safety performance, and cycle performance of lithium-ion batteries with metal lithium as the negative electrode.

Method used

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  • Electrolyte and preparation method and application thereof
  • Electrolyte and preparation method and application thereof
  • Electrolyte and preparation method and application thereof

Examples

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Embodiment 1

[0037] This embodiment provides a kind of electrolytic solution, the preparation method of described electrolytic solution is as follows:

[0038] Get 25 mass parts of 1,1,2,2-tetrafluoroethyl-2,2,3,3,-tetrafluoropropyl ether, 70 mass parts of ionic liquid solvent and mix, add 5 mass parts of lithium hexafluorophosphate, wherein The anion of the ionic liquid solvent is bisfluorosulfonyl imide ion, and the cation of the ionic liquid solvent is N-butyl-N-methylpiperidinium bis(trifluoromethanesulfonyl)imide ion.

Embodiment 2

[0040]This embodiment provides a kind of electrolytic solution, the preparation method of described electrolytic solution is as follows:

[0041] Get 30 mass parts of 1H, 1H, 5H-octafluoropentyl-1,1,2,2-tetrafluoroethyl ether, mix 62 mass parts of ionic liquid solvent, add 8 mass parts of LiODFB, wherein the ion The anion of the liquid solvent is bistrifluoromethanesulfonyl imide ion, and the cation of the ionic liquid solvent is 1-butyl-1-propylimidazolium bis(fluorosulfonyl)imide ion.

Embodiment 3

[0043] The only difference between this example and Example 1 is that the 1,1,2,2-tetrafluoroethyl-2,2,3,3,-tetrafluoropropyl ether is 45 parts by mass, and the ionic liquid solvent is 50 parts by mass. Parts by mass, other conditions and parameters are exactly the same as in Example 1.

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Abstract

The invention provides an electrolyte and a preparation method and application thereof. The electrolyte comprises electrolyte salt, a diluent and an ionic liquid solvent; the diluent is a fluorine-containing ether compound which does not dissolve the electrolyte lithium salt but is mutually soluble with the ionic liquid solvent; the ionic liquid solvent is nitrogen heterocyclic ring ionic liquid. The electrolyte is based on a lossless electrostatic shielding mechanism; a local high-concentration lithium salt system formed by matching the ionic liquid with the diluent has the effects of effectively controlling uniform deposition of lithium and inhibiting self-amplification growth of dendrites; the lithium dendrite inhibition effect can be maintained in the long cycle of the battery; the effects of protecting the metal lithium negative electrode, prolonging the cycle life of the battery and improving the safety are obvious.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and relates to an electrolytic solution and a preparation method and application thereof. Background technique [0002] Lithium metal has a very high specific capacity (3860mAh g -1 ) and the lowest redox potential (-3.04Vvs.SHE), the energy density of the constructed battery system can reach more than ten times that of traditional lithium-ion batteries; Dendrites have self-amplification behavior, which will pierce the separator and extend to the positive electrode, causing short circuit inside the battery, and even triggering fire and explosion; on the other hand, lithium dendrites are extremely reactive and will continuously consume electrolyte and activity. Lithium generates a continuously thickened SEI (solid electrolyte interphase) interface, resulting in lower coulombic efficiency and shorter cycle life, and the dendrites are wrapped by SEI or fall off, resulting in electroch...

Claims

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Application Information

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IPC IPC(8): H01M10/0566H01M10/058H01M10/0525
CPCH01M10/0566H01M10/058H01M10/0525H01M2300/0025Y02E60/10Y02P70/50
Inventor 郭佳幸彭燕秋袁中直刘建华刘金成
Owner EVE ENERGY CO LTD
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