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Electrolyte for lithium-air battery or lithium-copper battery

A lithium-air battery and electrolyte technology, which is applied to fuel cell type half cells and secondary battery type half cells, secondary batteries, and secondary battery repair/maintenance, etc., can solve the problem of unsatisfactory cycle performance and power performance. Not ideal, polarization, etc.

Active Publication Date: 2020-06-12
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the current lithium-air batteries still have serious polarization phenomena, resulting in unsatisfactory cycle performance, unsatisfactory power performance, and corrosion of metal lithium anodes.
For the polarization phenomenon of lithium-air batteries, the rapid diffusion of soluble catalysts in the electrolyte can effectively reduce the charging potential of the battery, but another problem is that the oxidized catalyst on the surface of the positive electrode will diffuse through the electrolyte. To the surface of the lithium negative electrode, the metal lithium is oxidized, not the Li of the positive electrode 2 o 2 , resulting in self-discharge of the battery, a phenomenon known as the shuttle effect of redox intermediates

Method used

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  • Electrolyte for lithium-air battery or lithium-copper battery
  • Electrolyte for lithium-air battery or lithium-copper battery
  • Electrolyte for lithium-air battery or lithium-copper battery

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preparation example Construction

[0042] (Preparation of Electrolyte)

[0043] The electrolyte solution for lithium-air batteries of the present invention can be prepared by the following production method.

[0044] That is, an electrolyte composed of a lithium salt is added to the above-mentioned organic solvent, stirred and confirmed to be completely dissolved, and an additive is added and stirred to be confirmed to be completely dissolved. The obtained electrolytic solution is dehydrated to reduce the water content in the electrolytic solution to 100 ppm or less, preferably 50 ppm or less, thereby obtaining the target electrolytic solution for lithium-air batteries. The electrolyte solution for lithium-air batteries of the present invention may have a viscosity at 25° C. of 20 cP or less.

[0045] By using the electrolyte solution for lithium-air batteries prepared in this way, lithium-air batteries can be produced, including button batteries, soft-pack batteries, hard-shell batteries, and the like. A lit...

Embodiment 1

[0064] Preparation of basic electrolyte: The electrolyte is a mixed system of tetraethylene glycol dimethyl ether (water content 10ppm) and bistrifluoromethanesulfonimide lithium (water content 50ppm), and bis Lithium trifluoromethanesulfonyl imide is stirred and confirmed to be completely dissolved to obtain a basic electrolyte, wherein the lithium bistrifluoromethanesulfonyl imide is 1mol / L;

[0065] Preparation of electrolyte solution for lithium-air battery: In a glove box (moisture <0.1ppm, oxygen content <0.1ppm) filled with argon, add triethyliodosulfur (moisture content 10ppm) to the basic electrolyte solution, the addition amount is 0.05mol / L, the structural formula of the electrolyte additive is as follows:

[0066]

[0067]Assembled battery: the positive electrode active material of the lithium-air battery is carbon nanotubes coated on carbon paper, the negative electrode is a circular metal lithium sheet with a diameter of 12 mm, the battery case is 2032 type, t...

Embodiment 2

[0071] In a glove box (moisture < 0.1ppm, oxygen < 0.1ppm) filled with argon, add choline iodide to the electrolyte in an amount of 0.01mol / L. The structural formula of the electrolyte additive is as follows:

[0072]

[0073] A lithium-air battery is assembled with this electrolyte. Other steps are with embodiment 1.

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Abstract

The invention relates to an electrolyte for a lithium-air battery or a lithium-copper battery, the electrolyte comprises a lithium salt, an organic solvent and an additive, the additive is an ionic organic halogen compound composed of halogen ions and organic cations, and the molar concentration of the additive in the electrolyte is 0.01-1 mol / L.

Description

technical field [0001] The invention relates to an electrolyte solution for a lithium-air battery or a lithium-copper battery containing a bifunctional electrolyte additive, and belongs to the technical field of batteries. Background technique [0002] With the rapid development of electric vehicles and portable electronic devices, the power and energy density of power supplies are also rapidly increasing. However, the energy density of secondary batteries that have been industrialized at present is lower than 150Wh kg -1 , making the development of secondary energy storage and electric vehicle industry subject to the low energy density of existing secondary batteries. At present, the performance of electric vehicles, especially the cruising range, is still difficult to compare with traditionally powered vehicles using internal combustion engines. In recent years, metal-air batteries, especially lithium-air batteries, have attracted widespread attention due to their ultra-...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0525H01M10/42H01M12/08
CPCH01M10/0525H01M10/0567H01M10/4235H01M12/08H01M10/42Y02E60/10
Inventor 张涛张晓平孙壮
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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