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Sulfuryl lithium battery electrolyte and lithium battery

An electrolyte and lithium battery technology, which is applied in secondary batteries, circuits, electrical components, etc., can solve the problems of low conductivity of organic-rich SEI, inability to inhibit the growth of lithium dendrites in the negative electrode, and difficulty in commercialization. High current charge and discharge capability, suppression of dendrite formation, and excellent film-forming properties

Pending Publication Date: 2022-07-08
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing electrolyte will be severely oxidized and decomposed on the surface of the positive electrode in a high-pressure environment, causing the battery capacity to rapidly decay
In addition, the organic-rich SEI produced by solvent decomposition on the surface of the negative electrode has the characteristics of low electrical conductivity, poor mechanical strength, and uneven thickness, which cannot inhibit the growth of lithium dendrites in the negative electrode.
In view of the above problems, the strategy of "high-concentration electrolyte" was proposed to solve the problem of continuous oxidation of solvents in high-pressure environments. However, the high price of lithium salts makes it difficult to commercialize this technology.

Method used

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  • Sulfuryl lithium battery electrolyte and lithium battery
  • Sulfuryl lithium battery electrolyte and lithium battery
  • Sulfuryl lithium battery electrolyte and lithium battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] (1) Preparation of positive electrode sheet

[0039] The cathode material lithium nickel manganate (LiNi 0.5 Mn 1.5 O 4 ), the conductive agent Super P, and the binder PVDF are mixed according to the mass ratio of 8:1:1, dispersed in the organic solvent NMP (N-methylpyrrolidone), stirred until stable and uniform to form a positive electrode slurry, and the positive electrode slurry is mixed. Squeegee coating on aluminum foil with a thickness of 12 μm, drying at 80°C, heating up to 120°C for further vacuum drying, and then rolling and slicing to form a positive electrode sheet.

[0040] (2) Electrolyte preparation

[0041] The sulfolane, tetrafluoroethyl tetrafluoropropyl ether, LiPF 6 (lithium hexafluorophosphate), LiDFOB (lithium difluorooxalate borate), and 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide were mixed, and were stirred with a magnetic stirrer until the lithium salts were completely dissolved to obtain Electrolyte. Among them, the mass...

Embodiment 2

[0045] Different from Example 1, this example replaces tetrafluoroethyl tetrafluoropropyl ether with hexafluoroisopropyl trifluoroethyl ether. The mass fractions of other components remained unchanged.

Embodiment 3

[0047] Different from Example 1, this example replaces tetrafluoroethyl tetrafluoropropyl ether with octafluoropentyl tetrafluoroethyl ether. The mass fractions of other components remained unchanged.

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Abstract

The invention discloses a sulfuryl lithium battery electrolyte and a lithium battery, the sulfuryl lithium battery electrolyte comprises tetramethylene sulfone, hydrofluoroether, lithium hexafluorophosphate, lithium difluoro (oxalato) borate and ionic liquid, the tetramethylene sulfone accounts for 48.2-52.4% of the total mass of the electrolyte; the obtained lithium battery charging cut-off voltage is greater than or equal to 4.9 V, and the discharging platform is greater than or equal to 4.7 V; high-voltage-resistant sulfolane and lithium hexafluorophosphate are used as a solvent and lithium salt, sulfolane has high dielectric constant and oxidation stability and can dissolve more lithium salt, the stability of the electrolyte under high voltage is ensured, the electrolyte has the oxidation decomposition potential of 5V or above, and the additive can inhibit formation of negative electrode lithium dendrites and prevent short circuit of the battery, so that the service life of the battery is prolonged, and the service life of the battery is prolonged. The conductivity and the high-voltage resistance are improved, and the safety of the battery is effectively improved.

Description

technical field [0001] The invention belongs to the technical field of energy storage materials, and relates to a sulfone-based lithium battery electrolyte and a lithium battery. Background technique [0002] Lithium batteries are widely used in 3C products and power batteries due to their high energy density, long cycle life, no memory effect, low self-discharge and environmental friendliness. With the development of portable electronic devices and new energy vehicles, it is particularly important to develop lithium-ion batteries with higher energy density. [0003] The energy density of current commercial lithium-ion batteries has reached a bottleneck, and further development of new battery materials is required to improve energy density. The most direct way to improve the energy density of lithium batteries is to increase the working voltage of the battery. The positive electrode can use high-voltage positive electrode materials, such as lithium nickel manganate and lith...

Claims

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Application Information

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IPC IPC(8): H01M10/0566H01M10/0525
CPCH01M10/0525H01M10/0566Y02E60/10
Inventor 李明涛海峰
Owner XI AN JIAOTONG UNIV