Electrolyte for lithium-air battery and corresponding battery product

A lithium-air battery and organic electrolyte technology, which is applied to fuel cell-type half-cells and secondary battery-type half-cells, etc., can solve the problems of incomplete reaction, affecting ORR reaction, and unsatisfactory efficiency, so as to achieve the overall The effect of accelerating the catalytic reaction, improving the reaction speed and improving the overall performance

Active Publication Date: 2013-09-18
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These catalysts exist in solid form. Although they are still effective for the discharge and charge reactions of lithium-air batteries, the efficiency does not meet the requirements. One of the important reasons is that the contact between the catalyst and the reactant is a prerequisite for its catalytic effect, while The discharge product of lithium-air batteries - lithium oxide is also a solid
In this way, during the discharge process, the lithium oxide generated by the reaction will adhere to the surface...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Using tetraethylene glycol dimethyl ether (TEGDME) as an organic solvent, add 0.1 mol / L lithium bistrifluoromethylsulfonimide (LiTFSI) and 0.01 mol / L phthalein in an anhydrous and oxygen-free environment. Iron cyanine (FePc), stirred evenly, stored in an anhydrous and oxygen-free environment, thus preparing an electrolyte containing a soluble catalyst.

[0030] The method of using this electrolyte to make a lithium-air battery is as follows: First, drill a hole in the positive shell of an ordinary stainless steel button battery (such as the positive shell of a CR2032 button battery) as a channel for oxygen to enter and exit. A layer of nickel foam is spread on the positive electrode shell with holes as the positive electrode collector without affecting the oxygen entry. Carbonized electrospun polyacrylonitrile fibers are used as the positive electrode material, which is composed of carbon fibers with a diameter of about 400nm, and the average spacing of carbon fibers is...

Embodiment 2

[0034] With dry dimethylsulfoxide (DMSO0) as an organic solvent, add 0.1mol / L lithium trifluoromethanesulfonate and 0.01mol / L FePc in an anhydrous and oxygen-free environment, stir evenly, and store in an anhydrous In an oxygen-free environment, the battery assembly and testing methods are the same as in Example 1.

[0035] Similar to the results of Example 1, comparing the lithium-air battery using the DMSO-LiTFSI electrolyte dissolved with FePc and the battery using the DMSO-LiTFSI electrolyte without dissolving FePc, it can also be found that the dissolved FePc has an effect on the charge-discharge performance of the battery. There is an obvious lifting effect. At a discharge current density of 0.75mA cm -2 , the charging current density is 0.45mA cm -2 Under normal circumstances, without FePc, the discharge capacity of the first cycle is 2213mAh / g, the charge capacity of the first cycle is 980mAh / g, and the battery cannot be cycled. When there is FePc, the discharge cap...

Embodiment 3

[0037] In the experiment described in Example 2, iron phthalocyanine was replaced by cobalt phthalocyanine (CoPc), and the others remained unchanged. It was found that the discharge capacity of the battery in the first cycle was 2840mAh / g, and the charge capacity in the first cycle was 1900mAh / g. Although the battery is still Cannot be cycled, but the capacity is better than the sample without CoPc.

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Abstract

The invention discloses a lithium-air battery. The lithium-air battery comprises an air positive electrode, a lithium negative electrode and organic electrolyte which is filled between the air positive electrode and the lithium negative electrode, the organic electrolyte contains an aprotic organic solvent, lithium salt and a soluble catalyst, the soluble catalyst can select from phthalocyanine transitional metal compound and derivatives thereof, such as iron phthalocyanine and carboxylation or sulfated iron phthalocyanine. The invention also discloses electrolyte for the corresponding lithium-air battery. Through the electrolyte, a solution-phase catalytic system can be provided for the inside of the lithium-air battery, and thus even if a great amount of solid lithium oxide or lithium peroxide is formed on the surface of the air positive electrode, the favorable contact between the catalyst and a reactant can be guaranteed, the charging voltage of the lithium-air battery can be correspondently reduced, the discharging voltage can be increased, the rate capacity performance of the battery also can be improved, the capacity can be increased, and the cycling performance of the battery can be improved.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, and more specifically relates to an electrolyte solution for lithium-air batteries and corresponding battery products. Background technique [0002] A lithium-air battery is a battery that uses lithium as the negative electrode and oxygen or pure oxygen in the air as the positive electrode reactant. Since oxygen can be obtained from the environment without being stored in the battery, it has a higher energy density than lithium-ion batteries, so it has become a research and development hotspot worldwide in recent years, and is expected to become a new generation of secondary batteries. The basic working principle of lithium-air batteries is: Oxygen reduction reaction (ORR) occurs during discharge. At this time, the lithium on the negative electrode releases electrons and becomes Li+. Li+ passes through the electrolytic material and combines with oxygen and electrons flowing from the ext...

Claims

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Application Information

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IPC IPC(8): H01M12/08
CPCY02E60/10
Inventor 沈越黄云辉孙丹张旺
Owner HUAZHONG UNIV OF SCI & TECH
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