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Auxiliary electrode film of lithium air battery as well as preparation and application method thereof

A lithium-air battery and auxiliary electrode technology, applied in battery electrodes, fuel cell-type half-cells, primary battery-type half-cells, fuel cells, etc., can solve the problems that the cycle life of lithium-air batteries needs to be improved, and achieve excellent viscosity Junction, high stability, and the effect of improving electronic conductance

Active Publication Date: 2016-09-28
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at practical problems such as the cycle life of lithium-air batteries needs to be improved, the present invention proposes an auxiliary electrode film for lithium-air batteries, which mixes carbon materials and polyvinyl acetal-based polymer binders evenly, and compound them on polyvinyl acetal-based polymer binders. One side of the polymer porous film

Method used

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  • Auxiliary electrode film of lithium air battery as well as preparation and application method thereof
  • Auxiliary electrode film of lithium air battery as well as preparation and application method thereof
  • Auxiliary electrode film of lithium air battery as well as preparation and application method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Stir 9.80 mg of carbon nanotubes and 0.98 mg of polyvinyl formal in 176.4 mg of N-methylpyrrolidone for 9 hours, sonicate for 2.5 hours, add 0.9500 g of pure water, and stir for 10 hours to obtain a slurry. Wherein, the structural unit of polyvinyl formal is:

[0030]

[0031] (where R3=R4=H)

[0032] The polyvinyl formal (PVFM) based polymer film has a thickness of 85 μm and a porosity of 62.3%. Cut the polymer film into an area of ​​3×3cm 2 of squares. The above-mentioned slurry was scraped and coated on the film with a doctor blade, and the coating thickness was 100 microns. Blast heating at 80°C for 8 hours to obtain an auxiliary electrode film with a carbon loading of 1.05 mg / cm 2 .

[0033] figure 1 The scanning electron microscope image of the composite layer side of the auxiliary electrode film prepared for Example 1, the linear structure in the figure is the positive electrode material carbon nanotube, as can be seen from the SEM image, the carbon mate...

Embodiment 2

[0035] Stir 5.40 mg of conductive carbon black and 0.65 mg of polyvinyl formal in 97.2 mg of N-methylpyrrolidone for 6 h, sonicate for 1.5 h, add 1.2650 g of pure water, and stir for 12 h to obtain a slurry. Wherein, the structural unit of polyvinyl formal is:

[0036]

[0037] (where R3=R4=H)

[0038] The polyvinyl formal (PVFM) based polymer film has a thickness of 105 μm and a porosity of 73.2%. Cut the polymer film into an area of ​​3×3cm 2 The polymer film is fixed with a template, the slurry is poured on the film, the template is vibrated to spread the slurry on the whole film, and the mass of the added positive electrode coating is 0.7450g. Heated by blowing air at 100°C for 10 hours to obtain a membrane electrode substrate with a carbon load of 0.33 mg / cm 2 .

[0039] figure 2 The auxiliary electrode film prepared for Example 2 was cut into Φ=12mm discs, and the charge-discharge cycle test results of assembling a CR2032 button lithium-air battery. Among them,...

Embodiment 3

[0049] Stir 8.54 mg of graphene and 1.20 mg of polyvinyl butyral in 135.00 mg of N-methylpyrrolidone for 10 h, sonicate for 3 h, add 1.2000 g of pure water, and stir for 16 h to obtain a slurry. Wherein, the structural unit of polyvinyl butyral is:

[0050]

[0051] (where R3=R4=CH 2 CH 2 CH 3 )

[0052] The polyvinyl butyral (PVB)-based polymer film had a thickness of 150 μm and a porosity of 84.3%. Cut the polymer film into an area of ​​3×3cm 2 The polymer film was fixed, and the slurry was evenly sprayed on the surface of the polymer film with an airbrush. Each time it was sprayed, it was air-dried at 90°C for 45 minutes, and sprayed 8 times in total. Heated with air blast at 100°C for 12 hours to obtain an auxiliary electrode film with a carbon loading of 0.18 mg / cm 2 .

[0053] Figure 4 The capacity retention rate of the auxiliary electrode film-assembled lithium-air battery prepared in Example 3 in charge-discharge cycle tests at different rates. The auxilia...

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Abstract

The invention discloses an auxiliary electrode film of a lithium air battery. A preparation method of the auxiliary electrode film comprises the steps of mixing a carbon material with a polyvinyl acetal based adhesive, then compounding the mixture on one side of a polyvinyl acetal based porous polymer film to obtain the auxiliary electrode film. An application method of the auxiliary electrode film comprises the steps of assembling the lithium air battery by using the auxiliary electrode film, enabling one side with a carbon material compound layer to face an air positive electrode, and enabling one side uncompounded with the carbon material to face a negative electrode or a diaphragm of the lithium air battery. The auxiliary electrode film of the lithium air battery has excellent structural stability and chemical stability; the inner resistance of a lithium air battery system can be reduced; reversible decomposition reaction of discharge products can be facilitated; more storage space is supplied to the discharge products; a stable three-phase reaction interface formed by an air channel, an ionic conductor and an electronic conductor is guaranteed in a lithium air battery open system and the long-term cycle process; the cycle life of the lithium air battery is significantly prolonged.

Description

technical field [0001] The invention belongs to the technical field of chemical power sources, and in particular relates to an auxiliary electrode film and a lithium-air battery containing the auxiliary electrode film. Background technique [0002] Li-air battery is a battery system composed of metal lithium negative electrode and oxygen pair. Oxygen participates in the electrochemical reaction but is not stored inside the battery. Therefore, theoretically speaking, the capacity of lithium-air battery is only limited by the lithium negative electrode. Since the chemical equivalent of lithium metal is as high as 3860mAh / g, the theoretical specific energy of the corresponding lithium-air battery reaches 11140Wh / kg, which is 6 to 9 times that of lithium-ion batteries, and is equivalent to the specific energy of gasoline (13000Wh / kg). In 1996, K.M.Abraham and Z.Jiang successfully assembled a rechargeable lithium-oxygen battery for the first time using PAN-based organic polymer e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/0226H01M8/0228H01M8/0221H01M8/0213H01M4/88H01M12/06
CPCH01M4/8828H01M8/0213H01M8/0221H01M8/0226H01M8/0228H01M12/06Y02E60/50
Inventor 连芳孟楠丁鹏冲李亚迪赵晓凤
Owner UNIV OF SCI & TECH BEIJING
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