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Electrolyte and preparation method thereof and lithium-sulfur battery

An electrolyte and electrolyte technology, applied in the field of lithium battery electrode material preparation, can solve the problems of low coulombic efficiency of lithium-sulfur batteries, loss of positive active material, low conductivity of organic all-solid-state electrolytes, etc., to improve the Coulombic efficiency and capacity retention rate , the effect of inhibiting solubility

Inactive Publication Date: 2018-04-03
QINGDAO DONGHAO SOFTWARE TECH CO LTD
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0003] The lithium-sulfur battery system is also the focus of extensive research in the current academic circles. It is generally believed that the main problems of lithium-sulfur batteries are: 1) The electronic conductivity of elemental sulfur is low
2) The Sxn- anion generated during charging and discharging has a strong nucleophilic ability, and it interacts with solvents such as carbonate and LiPF 6 or electrolyte materials, so traditional lithium-ion battery electrolytes are not suitable for lithium-sulfur batteries system, 3) The polysulfides (Li2S x) (x=4~8) produced during charging and discharging will gradually dissolve into the electrolyte and shuttle between the positive and negative electrodes, resulting in the loss of positive active materials, and at the same time It is also an important factor for the low coulombic efficiency and fast capacity decay of lithium-sulfur batteries
4) Using metal lithium as the negative electrode, there is a problem of lithium dendrites in the long cycle process
It has also been reported that the selection of solid-state electrolytes can partially inhibit the generation of dendrites (X.Liang, et al., Journal of Power Sources, 2011, 196, 3655), but the conductivity of organic all-solid-state electrolytes is low, resulting in the battery's low temperature at room temperature. Difficult to charge and discharge with high current

Method used

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  • Electrolyte and preparation method thereof and lithium-sulfur battery

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Comparison scheme
Effect test

Embodiment 1

[0025] 1. Preparation of electrolyte materials

[0026] Lithium reference preparation of perfluoroalkylsulfonylimides. Preparation of ionic liquids containing ether functional groups.

[0027] 2. Preparation of electrolyte

[0028] In an argon atmosphere glove box (H2O<1ppm), dissolve 1M lithium trifluoromethanesulfonyl imide in N,N-diethyl-N,N-di(methoxyethyl)ammonium-tris In the fluoromethylsulfonylimide salt, fully stir evenly to obtain the lithium-sulfur battery electrolyte (free acid<5ppm, moisture<10ppm) of the present invention.

[0029] 3. Preparation of lithium-sulfur battery

[0030] Place the sulfur-based positive pole piece, the separator, and the lithium metal sheet in the battery case, add the electrolyte solution prepared in this example dropwise, and seal it to prepare a CR2025 button battery.

[0031] 4. Test method for flame retardant performance of electrolyte

[0032] Soak an equal weight of glass wool in the electrolyte solution for 10 minutes, then t...

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Abstract

The invention provides an electrolyte and a preparation method thereof and a lithium-sulfur battery prepared by adopting the electrolyte. The electrolyte comprises an electrolyte lithium salt, a non-aqueous organic solvent and an ether functional group-comprising ionic liquid. By taking the ether functional group-comprising ionic liquid as the solvent, the vapor pressure of the electrolyte can belowered obviously and the flame retardancy of the electrolyte can be improved; and by virtue of existence of the ether functional group, the solubleness and degree of dissociation of the lithium saltin the electrolyte can be improved.

Description

technical field [0001] The invention relates to the field of preparation of lithium battery electrode materials, in particular to an electrolytic solution and a preparation method thereof, and a lithium-sulfur battery prepared by using the electrolytic solution. Background technique [0002] With the rapid development of compact portable electronic devices and power batteries, the demand for high energy density batteries is increasing. Elemental sulfur has a high theoretical specific capacity (1675mAh / g) and specific energy (2600Wh / kg), which is more than five times the theoretical energy density of traditional lithium-ion batteries. The actual energy density of lithium-sulfur batteries currently developed is 400~ 600Wh / kg, which is 2 to 3 times the actual energy density of commercial lithium-ion batteries. Elemental sulfur as a cathode material also has the advantages of abundant natural reserves, low price, and environmental friendliness. [0003] The lithium-sulfur batt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0566H01M10/0569
CPCH01M10/0566H01M10/0569H01M2300/0028Y02E60/10
Inventor 盖浩然
Owner QINGDAO DONGHAO SOFTWARE TECH CO LTD
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