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Symmetrical lithium-oxygen battery

A lithium-oxygen battery, symmetrical technology, applied in the field of electrochemical energy storage, to achieve the effect of good conductivity, large specific surface area, and excellent electrochemical performance

Inactive Publication Date: 2020-04-24
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problems of negative lithium dendrites, stability, battery safety performance and cycle performance, the present invention provides a symmetrical lithium-oxygen battery

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Clean the copper foam with 1M HCl ultrasonically for 10-20min to remove the surface oxide layer, then rinse it with distilled water to make it neutral, and dry it in vacuum at 60°C; immerse the treated foam copper in 0.1M (NH4) 2 S 2 o 8 Mix the solution with 2.5M NaOH for 20 minutes, and there is a layer of blue Cu(OH) on the surface of the foam copper 2 Generated; the resulting Cu(OH) 2 @Cu Foam at 5%H 2 Heating at 450°C for 5h under / Ar atmosphere, the Cu(OH) 2 Reduction to Cu; finally immerse Cu@Cu Foam in 1mM HAuCl 4 solution, in 5% H 2 / Ar atmosphere at 400°C for 4 hours to obtain Au / Cu@Cu Foam; SEM and TEM images of Au / Cu@Cu Foam, as shown in figure 1 and figure 2 As shown, the Au / Cu arrays are vertically grown on the copper foam substrate, and the Au cladding layer is about 4nm.

[0027] Lithium is the negative electrode, Au / Cu@Cu Foam is the positive electrode, the electrolyte is 1.0M equal volume ratio of DME and DOL LiTFSI (lithium bistrifluoromethyl...

Embodiment 2

[0034] Clean the copper foam with 1M HCl ultrasonically for 10-20min to remove the surface oxide layer, then rinse it with distilled water to make it neutral, and dry it in vacuum at 60°C; immerse the treated foam copper in 0.1M (NH4) 2 S 2 o 8 Mix the solution with 2.5M NaOH for 20 minutes, and there is a layer of blue Cu(OH) on the surface of the foam copper 2 Generated; the resulting Cu(OH) 2 @Cu Foam at 5%H 2 / Ar atmosphere at 500°C for 4h, the Cu(OH) 2 Reduction to Cu; finally soak Cu@Cu Foam in 5mMAgNO 3 solution, in 5% H 2 / Ar atmosphere at 450°C for 2h to obtain Ag / Cu@Cu Foam

[0035] Lithium is the negative electrode, Ag / Cu@CuFoam is the positive electrode, the electrolyte is 1.0M LiTFSI solution of DME and DOL with equal volume ratio, 0.5MLiNO 3 As an additive, a 2032 battery is assembled. Use 1mA / cm 2 Current density deposition 10mAh / cm 2 Metallic Li to Ag / Cu@CuFoam.

[0036]A symmetrical lithium-oxygen battery was assembled for electrochemical performanc...

Embodiment 3

[0038] The nickel foam was ultrasonically cleaned with 1M HCl for 10 minutes to remove the surface oxide layer, then rinsed with distilled water to make it neutral, and dried in vacuum at 60°C. Configured with 10mM HAuCl 4 solution. 30mL10mM HAuCl 4 solution with 30mL CH 3 CH 3 Mix equal volumes of OH, then put nickel foam into the mixed solution, and irradiate with 500W xenon lamp for 30min. Gold nanoparticles were successfully photoreduced onto nickel foam to obtain Au@Ni Foam.

[0039] Lithium is the negative electrode, Au@Ni Foam is the positive electrode, the electrolyte is 1.0M LiTFSI solution of DME and DOL with equal volume ratio, 0.1MLiNO 3 As an additive, a 2032 battery is assembled. Use 2mA / cm 2 Current density deposition 10mAh / cm 2 Metallic Li to Au@NiFoam.

[0040] Assemble a symmetrical lithium-oxygen battery for electrochemical performance testing. The deposited Li's Au@Ni Foam was used as the negative electrode, Au@NiFoam was used as the positive elec...

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Abstract

The invention relates to the technical field of electrochemical energy storage, in particular to a symmetric lithium-oxygen battery. The positive electrode and the negative electrode of the battery have the same structure. A lithium bis(trifluoromethylsulfonyl) imide solution of 1.0M tetraethylene glycol dimethyl ether is adopted as an electrolyte. The electrodes are made of a three-dimensional porous all-metal material. The three-dimensional porous all-metal material comprises an electrode substrate material and a lithium-philic and catalyst material. Compared with a traditional commercial carbon SuperP lithium-oxygen battery, the symmetric lithium-oxygen battery has excellent electrochemical performance, and the specific capacity of the symmetric lithium-oxygen battery is 27270mAh / g which is five times that of the SuperP lithium-oxygen battery and is the highest specific capacity of a non-carbon positive electrode reported at present; the overpotential is 0.6 V, which is 1.08 V lowerthan that of a SuperP lithium-oxygen battery, and the cycling stability is improved by 5 times; and after the SuperP lithium-oxygen battery is circulated for 50 circles, the surface of the lithium negative electrode is rough, dendritic crystals and dead lithium are generated, but the surface of the negative electrode of the symmetric lithium-oxygen battery is still smooth and does not generate dendritic crystals.

Description

technical field [0001] The invention relates to the technical field of electrochemical energy storage, in particular to a symmetrical lithium-oxygen battery. Background technique [0002] With the rapid development of social economy, more and more energy and environmental problems are facing people, and it is increasingly urgent to find new clean energy sources that are environmentally friendly and sustainable. With its ultra-high energy and current density, lithium-air batteries have attracted widespread attention, and have been recognized by major developed countries in the world as the next-generation energy storage and supply system that can replace gasoline internal combustion engines. [0003] A lithium-air battery is a battery that uses oxygen in the air as the positive electrode and metallic lithium as the negative electrode. Oxygen, the main active substance, comes from the atmosphere and is inexhaustible, which greatly reduces the operating cost of the battery and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/134H01M4/66H01M4/86H01M4/90H01M12/08
CPCH01M4/134H01M4/661H01M4/8621H01M4/9041H01M12/08Y02E60/10
Inventor 季桂娟罗楠徐吉静
Owner JILIN UNIV
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