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A kind of electrolytic solution additive and application thereof for reducing charging overpotential of lithium-air battery

An electrolyte additive, lithium-air battery technology, which is applied to fuel cell type half cells and secondary battery type half cells, batteries, secondary batteries, etc., can solve the problems of poor cycle performance and large charging polarization, etc. Achieve good stability, reduce charging overpotential, improve cycle performance and service life

Active Publication Date: 2019-05-21
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art, aiming at the problems of large charging polarization and poor cycle performance of lithium-air batteries, to provide an electrolyte additive for reducing the charging overpotential of lithium-air batteries and its application. Liquid additives can reduce the charging overpotential of lithium-air batteries and improve their energy efficiency and cycle performance

Method used

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  • A kind of electrolytic solution additive and application thereof for reducing charging overpotential of lithium-air battery
  • A kind of electrolytic solution additive and application thereof for reducing charging overpotential of lithium-air battery
  • A kind of electrolytic solution additive and application thereof for reducing charging overpotential of lithium-air battery

Examples

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Embodiment 1

[0027] The lithium-air battery in this embodiment is composed of a button cell with a hole in the positive cover, a polytetrafluoroethylene cock, a stainless steel case, and a sealing gasket. The positive electrode material is made of commercial carbon cloth, the negative electrode is made of lithium metal, and the diaphragm is Whatman glass fiber uses the low-charge polarized electrolyte solution containing the electrolyte additive of the present invention as the electrolyte solution of the battery, and the electrolyte solution usage amount of each battery is 80 μ L, which is about 0.1 g.

[0028] The lithium-air battery preparation method of the present embodiment is as follows:

[0029] First, in an argon glove box (H 2 (0<1ppm) prepare conventional electrolyte: add the lithium salt weighed in the non-aqueous organic solvent to obtain conventional electrolyte, and put it in a clean serum bottle. Then, the electrolyte additive of the present invention is added to the conven...

Embodiment 2

[0041] The difference between this example and Example 1 is that the content of non-aqueous organic solvent anhydrous dimethyl sulfoxide accounts for 95% of the total weight of the low-charge polarized electrolyte, and the amount of electrolyte additive added is 1% of the total weight of the electrolyte.

Embodiment 3

[0043] The difference between this example and Example 1 is that the content of the non-aqueous organic solvent anhydrous dimethyl sulfoxide accounts for 93% of the total weight of the low-charge polarized electrolyte, and the addition amount of the electrolyte additive is 1.5% of the total weight of the electrolyte.

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Abstract

The invention discloses an electrolyte additive for reducing the charging overpotential of a lithium-air battery and its application. The electrolyte additive is formed by ruthenium dichloride and two N,N-dimethyl-o-diphenylphosphineaniline ligands. Complexes, whose chemical formula is (o‑Ph 2 PC 6 h 4 NMe 2 ) 2 RuCl 2 , the molecular weight is 782; the present invention also provides the low-charge polarized electrolyte containing the electrolyte additive, adding the above-mentioned additive in addition to the conventional electrolyte component non-aqueous organic solvent and lithium salt, wherein the content of the non-aqueous organic solvent 80-95% of the total weight, the concentration of the lithium salt is 0.4-1M, and the content of the electrolyte additive is 1-5% of the total weight; meanwhile, the present invention also provides the application of the above-mentioned electrolyte in lithium-air batteries, It can greatly reduce the overpotential of lithium-air battery charging, and improve energy efficiency and cycle life. The electrolytic solution of the invention has a simple preparation method and can be prepared in large quantities, and the lithium-air battery containing the electrolytic solution can circulate stably under relatively large current.

Description

technical field [0001] The invention belongs to the technical field of lithium-air batteries, and in particular relates to an electrolyte additive for reducing charging overpotential of lithium-air batteries and an application thereof. Background technique [0002] With the increasing demand for high specific energy energy storage systems, rechargeable lithium-air batteries have become a research hotspot as a new type of energy storage system. The theoretical specific energy of lithium air battery is as high as 11430Wh kg -1 (based on the reversible reaction 2Li+O 2 → Li 2 o 2 , Balanced electromotive force 2.96V), this value is five to ten times that of traditional lithium-ion batteries, and has the same energy density as gasoline, so lithium-air batteries have great application prospects in the fields of hybrid electric vehicles and pure electric vehicles. However, lithium-air batteries still have many challenges before practical applications, such as poor rate perform...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0567H01M12/08
CPCH01M10/0567H01M12/08H01M2300/0025H01M2220/20Y02E60/10
Inventor 范镜敏董全峰郑明森蔡森荣
Owner XIAMEN UNIV
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