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A kind of ionic liquid-based electrolyte for lithium-air battery and its lithium-air battery system

A lithium-air battery and ionic liquid technology, which is applied to battery electrodes, fuel cell half-cells, secondary battery-type half-cells, secondary batteries, etc., can solve the problems of poor electrode wettability and reduce interface impedance , High electrochemical stability, low viscosity effect

Active Publication Date: 2020-11-17
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide an electrolyte composed of lithium salt, ionic liquid, organic co-solvent and lithium nitrate, which can overcome the high viscosity of ionic liquid, poor electrode wettability, low lithium salt solubility, etc. while taking advantage of the advantages of ionic liquid. The problems in the application of lithium-air batteries make the ionic liquid-based electrolyte system of lithium-air batteries have high conductivity, high oxidation resistance, high stability, and excellent hydrophobicity

Method used

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  • A kind of ionic liquid-based electrolyte for lithium-air battery and its lithium-air battery system
  • A kind of ionic liquid-based electrolyte for lithium-air battery and its lithium-air battery system
  • A kind of ionic liquid-based electrolyte for lithium-air battery and its lithium-air battery system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Take 2.4mL N‐methyl‐N‐propylpyrrole bistrifluoromethanesulfonimide salt (PYR 1(1o2) TFSI) and 3.6mL dimethyl sulfoxide (DMSO), the volume ratio is 0.4:0.6 (where x=0.4), the two are mixed, and 0.9115g lithium hexafluorophosphate LiPF is added 6 (1mol / L), then add 0.0827g lithium nitrate (0.2mol / L), and magnetically stir for 24h to obtain an ionic liquid-based mixed electrolyte. The above steps are all operated in a glove box with water content and oxygen content less than 0.5ppm. Among them, the ionic liquid cationic PYR 1(1o2) + The structural formula is:

[0026] (where R1 is CH 2 CH 2 OCH 3 , R2 is CH 3 ),

[0027] Moreover, the anion of the ionic liquid is (CF 3 SO 2 ) 2 N - , abbreviated as TFSI - .

[0028]figure 1 Be the variation curve graph of the shear viscosity of embodiment 1 with shear rate. The shear viscosity of the mixed electrolyte is small, when the shear rate is 100S -1 , the shear viscosity of the ionic liquid-based electrolyte is 6...

Embodiment 2

[0032] Measure 1.8mL of N-methyl-N-butylpyrrole trifluoromethanesulfonate (PYR 14 CF 3 SO 3 ) and 4.2mL tetraethylene glycol dimethyl ether (TEGDME), the volume ratio is 0.3:0.7 (where x=0.3), the two are mixed, and 1.3781g lithium bistrifluoromethylsulfonimide LiTFSI (0.8mol / L) dissolved in it, then add 0.2069g lithium nitrate LiNO 3 (0.5mol / L) into the mixed solvent, and magnetically stirred for 24h to obtain an ionic liquid-based mixed electrolyte. The above steps are all operated in a glove box with water content and oxygen content less than 0.5ppm. Among them, the ionic liquid cationic PYR 14 + The structural formula is:

[0033] (where R1 is CH 2 CH 2 CH 2 CH 3 , R2 is CH 3 ),

[0034] Moreover, the anion of the ionic liquid is CF 3 SO 3 - .

[0035] figure 2 The Li / / electrolyte / / Li battery assembled from the electrolyte prepared in Example 2 and the metal lithium sheet was tested for the change of the AC impedance of the battery over time. The inte...

Embodiment 3

[0039] Take 1.2mL of N‐methyl‐N‐butylpyrrole trifluoromethanesulfonate (PYR 13 CF 3 SO 3 ) and 4.8mL sulfolane (SL), the volume ratio is 0.2:0.8 (wherein x=0.2), the two are mixed, and 0.9361g lithium trifluoromethanesulfonate LiCF 3 SO 3 (1mol / L) was dissolved in the mixed solution, and then 0.2482g lithium nitrate LiNO 3 (0.6mol / L) into the mixed solution, and magnetically stirred for 24h to obtain an ionic liquid-based electrolyte. The above steps are all operated in a glove box with water content and oxygen content less than 0.5ppm. Among them, the ionic liquid cationic PYR 13 + The structural formula is:

[0040] (Wherein, R1 is CH2CH2CH3, R2 is CH3),

[0041] Moreover, the anion of the ionic liquid is CF 3 SO 3 - .

[0042] The above ionic liquid-based electrolyte is used to assemble a lithium-air battery, while the positive electrode material is carbon nanotube in-situ composite birnessite-type manganese dioxide, and the negative electrode uses metallic li...

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Abstract

The invention provides an ionic liquid-based electrolyte solution for a lithium air battery and a lithium air battery system thereof. The ionic liquid-base electrolyte solution is prepared from pyrrole ionic liquid, lithium salt, an organic cosolvent and a certain amount of lithium nitrate, and in this way, the air anode of the lithium air battery composed of the electrolyte solution is carbon nano tube in-situ composite birnessite type manganese dioxide. The ionic liquid-based electrolyte solution has outstanding electrochemical and chemical stability on O2 reduction-state matter, and a stable SEI (solid electrolyte interface) film can be formed on the surface of the cathode containing metal lithium. The lithium air battery system formed with the air anode of the carbon nano tube in-situcomposite birnessite type manganese dioxide gives full play to the advantages of embedded growing of an electric discharging product, improves the reversible reaction activity, and has a stable gas-liquid-solid reaction interface and more product storage sites, the cyclic life of the lithium air battery system is prolonged, and the rate capability of the lithium air battery system is substantiallyimproved.

Description

technical field [0001] The invention belongs to the technical field of chemical power sources, in particular to an ionic liquid-based electrolyte for a lithium-air battery and a lithium-air battery system composed of the same. Background technique [0002] The positive electrode in the lithium-air battery directly uses the oxygen in the air, which has a very high theoretical specific energy (3623Wh / kg, according to the product Li 2 o 2 calculation), which is much higher than the specific energy of lithium-ion batteries, and has the advantages of being environmentally friendly. However, there are still many problems in the practical application of lithium-air batteries. The electrolyte system is an important part of the lithium-air battery, especially in its special chemical working environment, the electrolyte system becomes the basis and key to ensure the high energy conversion efficiency and long working life of the lithium-air battery. At present, among the electrolyte...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0566H01M4/86H01M4/90H01M4/96H01M12/08
CPCH01M4/8647H01M4/9016H01M4/96H01M10/0566H01M12/08H01M2300/0025Y02E60/10
Inventor 连芳赵晓凤孟楠毛磊
Owner UNIV OF SCI & TECH BEIJING
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