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A kind of electrolyte additive for lithium-air battery

An electrolyte additive, lithium-air battery technology, applied in the direction of secondary batteries, organic electrolytes, non-aqueous electrolytes, etc., can solve the problems of poor cycle performance, large charging polarization, etc., achieve good stability, reduce charging overpotential, Recipe Simple Effects

Active Publication Date: 2019-11-26
XIAMEN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a kind of electrolytic solution additive and the low charging polarized electrolytic solution containing this electrolytic solution additive and lithium-air battery for lithium-air battery charging polarization is big, and cycle performance is poor, and this electrolytic solution additive can reduce Charging polarization of lithium-air batteries and improving their rate performance and cycle performance

Method used

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  • A kind of electrolyte additive for lithium-air battery
  • A kind of electrolyte additive for lithium-air battery
  • A kind of electrolyte additive for lithium-air battery

Examples

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Effect test

Embodiment 1

[0032] A kind of low-charge polarized electrolyte solution containing electrolyte additive, add the electrolyte additive (iodosophenone) that accounts for 0.94% of total weight 0.05M in the conventional electrolyte solution described in comparative example, obtain low charge polarized electrolytic solution liquid, packed in a clean serum bottle; the structural formula of the electrolyte additive is as follows:

[0033]

[0034] A lithium-air battery is assembled with the low-charge polarized electrolyte.

[0035] The lithium-air batteries assembled in the above examples and comparative examples were tested for their electrochemical performance in the voltage range of 2.4 to 4.5V at room temperature.

[0036] Such as figure 1 Shown is the electrochemical performance comparison between the additive-containing electrolyte and the conventional electrolyte. It can be seen from the results that adding iodosobenzene to the electrolyte for lithium-air batteries can greatly improv...

Embodiment 2

[0038] A low-charge polarized electrolyte containing an electrolyte additive, adding 0.87% of the total weight of 0.05M electrolyte additive to the conventional electrolyte described in the comparative example to obtain a low-charge polarized electrolyte, which is packed in a clean In the serum bottle; the structural formula of the electrolyte additive is as follows:

[0039]

[0040] A lithium-air battery is assembled with the low-charge polarized electrolyte.

Embodiment 3

[0042] A low-charge polarized electrolyte containing an electrolyte additive, adding 1.01% of the total weight of 0.05M electrolyte additive to the conventional electrolyte described in the comparative example to obtain a low-charge polarized electrolyte, which is packed in a clean In the serum bottle; the structural formula of the electrolyte additive is as follows:

[0043]

[0044] A lithium-air battery is assembled with the low-charge polarized electrolyte.

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Abstract

The invention discloses an electrolyte additive for a lithium-air battery. Adding additives to the conventional electrolyte can produce a low charge polarization electrolyte. The conventional electrolyte includes a non-aqueous organic solvent and a lithium salt, wherein the content of the non-aqueous organic solvent is 80% to 95% of the total weight. The electrolyte The mass of the additive is 0.1%-5% of the total weight; the electrolyte additive mentioned above is an iodine-containing benzene derivative. The electrolyte containing the additive can greatly reduce the charging polarization of the positive electrode of the lithium-air battery, improve energy efficiency, and can also inhibit the occurrence of side reactions, and improve the rate performance and cycle performance. The electrolytic solution has a simple preparation method and can be prepared in large quantities, and a lithium-air battery containing the electrolytic solution can cycle stably at a relatively large current.

Description

technical field [0001] The invention relates to an electrolyte additive capable of reducing the charge overpotential of a lithium-air battery and improving its cycle performance, and a low-charge polarized electrolyte containing the electrolyte additive and a lithium-air battery. Background technique [0002] With the development of economy and science and technology, the human energy structure is constantly changing towards a clean and sustainable direction. At present, lithium-ion batteries with the characteristics of high energy density and long cycle life have become the main power source of consumer electronics and play an extremely important role. However, with the development of high specific energy mobile devices, it is difficult for lithium-ion batteries to meet the current market demand, such as new energy vehicles, photovoltaic energy storage, power grid peak-shaving and other large-scale electric energy storage devices. Compared with lithium-ion batteries, non-a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0567H01M12/08
CPCH01M10/0567H01M12/08H01M2300/0025Y02E60/10
Inventor 郑明森董全峰范镜敏林晓东
Owner XIAMEN UNIV
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