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Direct activation method of lithium air battery of organic electrolyte system

A lithium-air battery, organic electrolyte technology, applied in electrical components, secondary batteries, electrochemical generators, etc., can solve problems such as easy access to batteries, unknown impact on cycle stability of lithium-air batteries, metal lithium corrosion, etc.

Active Publication Date: 2018-07-13
GUILIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Current research shows that lithium-air batteries face the following problems: metal lithium forms lithium dendrites during multiple deposition and stripping processes ( ACS Appl. Mater. Interfaces 2016, 8, 8561−8567 ), and the lithium-air battery needs to be designed as an open system, moisture or CO in the environment 2 Easy to enter the battery, with the active material O of the air cathode 2 Corrosion of lithium metal ( Adv. Funct. Mater. 2016, 26, 1747–1756 )
The activation process can be carried out directly through the charge-discharge cycle. However, through a large number of experiments, it has been found that the activation process may last for dozens to hundreds of cycles, and it takes days or even weeks. Due to the normal battery reaction during the activation process, the activation The impact of too long time on the metal lithium anode and air cathode, and the impact on the cycle stability of lithium-air batteries is not yet known

Method used

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  • Direct activation method of lithium air battery of organic electrolyte system
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Battery structure setting: a metal lithium sheet with a diameter of 16 mm is used as the anode, and 50 μL is dissolved with 1 mol / L LiClO 4 DMSO is the electrolyte solution, borosilicate glass fiber is the separator, and the cathode is a graphene-loaded 1cm 2 Carbon paper with a loading of 0.2 mg / cm 2 .

[0023] (2) Charging and discharging system setting: the charging and discharging range is 2 V to 4.5 V, the charging and discharging current density is 1000 mA / g, the charging and discharging capacity is 2000 mAh / g, and a button battery is assembled.

[0024] (3) The battery was left to stand in the glove box for 12 hours, and the charging and discharging range was set at 2 V to 4.5 V.

[0025] (4) The activated charge and discharge current density is 800 mA / g, and the activated capacity is 300 mAh / g.

[0026] (5) The number of activation cycles is 30.

Embodiment 2

[0028] (1) Battery structure setting: a metal lithium sheet with a diameter of 14 mm is used as the anode, 70 μL of DME dissolved with 0.5 mol / L LiTFSI is used as the electrolyte solution, borosilicate glass fiber is used as the separator, and the cathode is a 1 cm carbon nanotube-supported 2 Carbon paper with a loading of 0.5mg / cm 2 , to assemble the simulated battery.

[0029] (2) Charge and discharge system setting: the charge and discharge range is 2 V to 4.5 V, the charge and discharge current density is 2000 mA / g, and the charge and discharge capacity is 3000 mAh / g.

[0030] (3) The battery was left to stand in the glove box for 24 hours, and the charging and discharging range was set at 2 V to 4.5 V.

[0031] (4) The activated charge and discharge current density is 500 mA / g, and the activated capacity is 800 mAh / g.

[0032] (5) The number of activation cycles is 20.

Embodiment 3

[0034] (1) Battery structure setting: a metal lithium sheet with a diameter of 18 mm is used as the anode, and 1 mol / L LiPF is dissolved in 80 μL 6 TEGDME is the electrolyte solvent, nylon 66 is the separator, and the cathode is a 1cm carbon black loaded 2 Carbon paper with a loading of 0.1 mg / cm 2 , Assemble the button battery.

[0035] (2) Charge and discharge system setting: the charge and discharge range is 2 V to 4.5 V, the charge and discharge current density is 3000 mA / g, and the charge and discharge capacity is 5000 mAh / g.

[0036] (3) The battery was left to stand in the glove box for 48 hours, and the charging and discharging range was set at 2 V to 4.5 V.

[0037] (4) The activated charge and discharge current density is 400 mA / g, and the activated capacity is 500 mAh / g.

[0038] (5) The number of activation cycles is 20.

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Abstract

The invention discloses a direct activation method of a lithium air battery of an organic electrolyte system. The direct activation method is characterized in that: (1) a metal lithium sheet is used as a positive electrode, an organic solvent dissolved with (0.5-2) mole / liter of lithium salt is used as an electrolyte solution, a borosilicate glass fiber or nylon 66 is used as a separator, and a negative electrode is carbon material-loaded carbon paper of 1 cm<2>; (2) the charge-discharge zone is (2-4.5)V, the charge-discharge current density is (1,000-5,000) mA / g, and the charge-discharge capacity is (1,000-5,000) mAh / g; (3) the charge-discharge zone is (2-4.5)V; (4) the charge-discharge current density is (100-800) mAh / g; (5) the activation capacity is (25-800) mAh / g; and (6) the activation cycle frequency is 5-40. By the direct activation method, the purpose of improving circulation frequency of the lithium air battery can be improved, and the cycle lifetime of the lithium air battery can be remarkably prolonged.

Description

technical field [0001] The invention relates to a direct activation method of an organic electrolyte system lithium-air battery. Background technique [0002] With the expansion of the electric vehicle market, it is imperative to develop electric energy storage systems. Although lithium-ion batteries have been widely used in various fields of society, their specific energy density is low, which is far from being able to meet the power source of new energy vehicles. The specific energy of lithium-air batteries is much higher than that of lithium-ion batteries, even comparable to gasoline, and has become a research hotspot in recent years. [0003] A lithium-air battery consists of a lithium metal anode, an electrolyte, a separator, and an air cathode. Li = Li + +e - and O 2 + 2Li + + 2e - = Li 2 o 2 reaction( Adv. Energy Mater. 2016, 1600751 ). Current research shows that lithium-air batteries face the following problems: metal lithium forms lithium dendrites ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/44H01M12/08
CPCH01M10/446H01M12/08Y02E60/10
Inventor 罗志虹朱广彬胡承亮罗鲲
Owner GUILIN UNIVERSITY OF TECHNOLOGY
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