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Application of halogenated substituted imidazole as redox medium, electrolyte and lithium-oxygen battery

A lithium-oxygen battery and electrolyte technology, applied in the direction of secondary batteries, secondary battery repair/maintenance, fuel cell half-cells and secondary battery-type half-cells, etc., can solve battery energy attenuation, RM continuous consumption , metal lithium corrosion and other problems, to achieve the effect of reducing overpotential, prolonging life and increasing discharge capacity

Active Publication Date: 2020-12-29
NORTHEAST NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, RM - and RM + It will inevitably migrate from the positive electrode to the surface of the lithium negative electrode and have a side reaction with the lithium negative electrode, that is, the "shuttle effect", which will lead to the continuous consumption of RM and the corrosion of metal lithium, which will directly lead to the energy attenuation of the battery and even the failure of the battery.

Method used

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  • Application of halogenated substituted imidazole as redox medium, electrolyte and lithium-oxygen battery
  • Application of halogenated substituted imidazole as redox medium, electrolyte and lithium-oxygen battery
  • Application of halogenated substituted imidazole as redox medium, electrolyte and lithium-oxygen battery

Examples

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preparation example Construction

[0046] In the present invention, the preparation method of the electrolyte preferably comprises the following steps: after mixing the lithium salt and the aprotic solvent, adding a halogenated imidazole to the resulting mixed system to obtain the electrolyte.

[0047] The present invention also provides a lithium-oxygen battery, comprising a porous oxygen positive electrode, a lithium metal negative electrode, a separator, and an electrolyte, wherein the electrolyte is the electrolyte described in the above technical solution.

[0048] In the present invention, the lithium-oxygen battery includes a lithium metal negative electrode, a porous oxygen positive electrode, a diaphragm and an electrolyte.

[0049] In the present invention, the electrolyte solution in the lithium-oxygen battery is the electrolyte solution described in the above technical solution, which will not be repeated here.

[0050] The present invention has no special limitation on the lithium metal negative el...

Embodiment 1

[0061] The structural formula of halogenated substituted imidazole in the present embodiment is:

[0062]

[0063] Mix LiTFSI and TEGDME to obtain a mixed solution with a LiTFSI concentration of 1 mol / L, then add the halogenated imidazole of this embodiment to the resulting mixed solution, stir for 72 hours, and obtain an electrolyte, wherein the concentration of the halogenated imidazole in the electrolyte is 0.1mol / L.

Embodiment 2

[0082] The structural formula of halogenated substituted imidazole in the present embodiment is:

[0083]

[0084] Lithium perchlorate and DMSO were mixed to obtain a mixed solution with a lithium perchlorate concentration of 1 mol / L, then the halogenated imidazole of this embodiment was added to the resulting mixed solution, and stirred for 72 hours to obtain an electrolytic solution, wherein, in the electrolytic solution The concentration of halogenated imidazole is 0.2mol / L.

[0085]Under an argon atmosphere, the electrolyte solutions of Example 2 and Comparative Examples 1 to 2 were respectively subjected to CV scanning using a three-electrode system, and the obtained CV scanning diagrams are shown in Figure 5 . Depend on Figure 5 It can be seen that, like the system containing LiI, the electrolyte system provided by Example 2 also exhibits a low potential pair (I - / I 3 - ) redox peak and high potential pair (I 3 - / I 2 ) redox peak; while Comparative Example...

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Abstract

The invention belongs to the technical field of batteries, and particularly relates to application of halogenated substituted imidazole as a redox medium, an electrolyte and a lithium-oxygen battery.The invention provides the application of halogenated substituted imidazole as the redox medium in the lithium-oxygen battery. In the application, the halogenated substituted imidazole is used as theredox medium, so that the generation of Li2O2 can be effectively promoted, the decomposition efficiency of Li2O2 can be effectively improved, the overpotential of the lithium-oxygen battery can be reduced, and a solid electrolyte interface film protective layer can be generated on the surface of a lithium metal negative electrode in situ, so that a shuttle effect is inhibited, and the cycle life of the lithium-oxygen battery is prolonged. The embodiment shows that the lithium-oxygen battery obtained by taking the halogenated substituted imidazole provided by the invention as the redox medium is long in cycle life and low in charging voltage.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to the application of a halogenated substituted imidazole as a redox medium, an electrolyte and a lithium-oxygen battery. Background technique [0002] Lithium-oxygen battery is a battery that uses lithium as the negative electrode and oxygen as the positive electrode reactant. It has an ultra-high theoretical energy density, but due to the poor stability of the lithium metal negative electrode, the discharge product (Li 2 o 2 )’s intrinsic decomposition reaction kinetics is sluggish, and the reversibility of the oxygen cathode is poor, resulting in a large overpotential, poor cycle stability and rate performance of the lithium-oxygen battery. [0003] Catalysts can improve the large overpotential problem of lithium-oxygen batteries to a certain extent, but the active sites of solid-phase catalysts are insulated by Li 2 o 2 After covering, the charge transport at th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M12/08H01M10/42
CPCH01M10/0567H01M10/4235H01M12/08Y02E60/10
Inventor 刘佳李丹谢海明刘军
Owner NORTHEAST NORMAL UNIVERSITY
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