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Electrolyte as well as preparation method thereof and lithium sulfur battery

An electrolyte and electrolyte technology, which is used in non-aqueous electrolyte batteries, electrolyte battery manufacturing, lithium batteries, etc., can solve the problems of low coulombic efficiency of lithium-sulfur batteries, loss of positive active material, and rapid capacity decay, so as to improve the coulombic efficiency and The effect of capacity retention, improved solubility and dissociation, and improved flame retardancy

Inactive Publication Date: 2014-09-03
DONGUAN KAIXIN BATTERY MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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 S generated during charging and discharging x n- Anion has a strong nucleophilic ability, and it is compatible with carbonate, LiPF 6 There are interactions between solvents or electrolyte materials, so traditional lithium-ion battery electrolytes are not suitable for lithium-sulfur battery systems. 3) Polysulfides (Li 2 S x ) (x=4~8) will gradually dissolve into the electrolyte and shuttle between the positive and negative electrodes, resulting in the loss of positive active materials, and this 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 as well as preparation method thereof and lithium sulfur battery
  • Electrolyte as well as preparation method thereof and lithium sulfur battery
  • Electrolyte as well as preparation method thereof and lithium sulfur battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 1. Preparation of electrolyte materials

[0027] Lithium perfluoroalkylsulfonylimide preparation (L.Conte, et al., J.Fluorine Chem., 2004, 125:243; C. Zhang, et al., Eur.J.Inorg.Chem.2012 :3419). Preparation of ionic liquids containing ether functional groups (Z.Zhou, et al., Chem. Eur. J., 2005, 11:752).

[0028] 2. Preparation of electrolyte

[0029] in an argon atmosphere glove box (H 2 O<1ppm), dissolve 1M lithium trifluoromethylsulfonimide into N,N-diethyl-N,N-bis(methoxyethyl)ammonium-trifluoromethylsulfonimide salt , fully stirred evenly, namely to obtain the lithium-sulfur battery electrolyte (free acid<5ppm, moisture<10ppm) of the present invention.

[0030] 3. Preparation of lithium-sulfur battery

[0031] 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.

[0032] 4. Test method for flam...

Embodiment 2-13

[0037]

[0038]

[0039] The test result of table 2 embodiment and comparative example

[0040]

[0041] The above experimental data show that the electrolyte solution of the present invention has obvious flame retardant function, and the battery using the electrolyte solution obviously has a better capacity retention rate.

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PUM

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Abstract

The invention provides electrolyte as well as a preparation method thereof and a lithium sulfur battery prepared by the electrolyte. The electrolyte comprises electrolyte lithium salt, a non-aqueous organic solvent and ion liquid containing ether-base functional groups. The ion liquid containing the ether-base functional groups is used as a solvent, so that the vapor pressure of the electrolyte can be remarkably reduced, the flame resistance of the electrolyte is improved, and the solubility and the degree of dissociation of lithium salt in the electrolyte can be improved in the presence of the ether-base functional groups.

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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IPC IPC(8): H01M10/0566H01M10/052
CPCY02E60/122H01M10/0525H01M10/0569H01M10/058Y02E60/10
Inventor 仰永军韩鸿波陈卫
Owner DONGUAN KAIXIN BATTERY MATERIAL
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