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An all-solid-state lithium-air battery and its preparation method and application

An air battery and all-solid-state technology, which is applied in the direction of fuel cell half-cells and primary battery-type half-cells, can solve the problems of large battery polarization resistance, large battery contact resistance, and easy reaction with lithium metal anodes. , to achieve the effect of improving performance, increasing effective area, and large specific surface area

Active Publication Date: 2018-03-23
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The prior art reports a solid-state lithium-air battery based on a phosphate solid electrolyte, but all use a phosphate solid electrolyte material with a NASICON structure, such as Li 1.3 Al 0.3 Ti 1.7 (PO 4 ) 3 (LATP) and Li 1+ x Al y Ge 2-x (PO 4 ) 3 (LAGP), this type of solid electrolyte material is unstable and easily reacts with the lithium metal anode; therefore, in these reported solid lithium-air batteries, it is necessary to place a saturated liquid between the lithium metal anode and the solid electrolyte. The diaphragm material of the organic electrolyte, on the one hand, increases the lithium ion transmission path when the battery is working. On the other hand, the use of the organic electrolyte still inevitably brings about the safety of the battery, and the battery cannot be called an all-solid lithium battery. - air battery
The garnet-type oxide lithium-ion solid electrolyte has high lithium-ion conductivity, and its conductivity and sintering performance can be improved by doping; but the current research on the garnet-type oxide lithium-ion solid electrolyte mainly focuses on material preparation, There are no reports on the use of it to make all-solid-state lithium-air battery devices in terms of basic performance improvement and lithium ion transfer mechanism.
In addition, the existing solid-state lithium-air batteries are all button-type, and the physical contact between the lithium metal anode, the air electrode and the solid-state electrolyte is purely achieved by extrusion. The battery assembled in this way has a large contact resistance, and the battery During the reaction, lithium ions and oxygen negative ions are only transferred at the layer-to-layer contact surface, and the battery polarization resistance is also relatively large.

Method used

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  • An all-solid-state lithium-air battery and its preparation method and application
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  • An all-solid-state lithium-air battery and its preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0042] Accurately weigh 3.6 g Li 7 La 3 Zr 2 o 12 and 0.8 g polyethersulfone (PESf), then add 3.6 g N,N-dimethylpyrrolidone (NMP) and put it in an agate ball mill jar, and ball mill for 4h to obtain a uniform viscous slurry, which is transferred to a test tube, Use a glass rod with a diameter of about 0.3 cm to impregnate the slurry, pull it out, and rotate it at a constant speed. After the thickness is uniform, soak it in pure water quickly to cause a phase inversion process. After soaking for 20 minutes, take out the glass rod to obtain a closed end. The tubular green body was finally sintered at 1050 °C for 12 h at a heating rate of 1 °C / min to obtain a tubular porous ceramic support with one end closed. The support body is 4 cm long and 0.6 cm in outer diameter.

[0043] Accurately weighed 1.47 g Li 7 La 3 Zr 2 o 12 , 0.042 g triethanolamine, 0.054 g dibutyl phthalate, 0.054 g polyethylene glycol, 0.06 g polyvinyl butyral, and 4.32 g ethanol are placed in an agate ...

Embodiment 2

[0049] Accurately weighed 7.2 g Li 6.5 La 3 Zr 1.5 Ta 0.5 o 12 and 1.6 g polyethersulfone (PESf), then add 7.2 g N, N-dimethylpyrrolidone (NMP) and put it in an agate ball mill jar, and ball mill for 4 hours to obtain a uniform viscous slurry, which is transferred to a test tube, Use a glass rod with a diameter of about 0.8 cm to impregnate the slurry, pull it out, and rotate it at a constant speed. After the thickness is uniform, quickly soak it in pure water to undergo a phase inversion process. After soaking for 20 minutes, take out the glass rod to obtain a closed end. The tubular green body was finally sintered at 1050 °C for 16 h at a heating rate of 1 °C / min to obtain a tubular porous ceramic support with one end closed. The support body is 6 cm long and 1.2 cm in outer diameter.

[0050] Accurately weighed 1.47 g Li 6.5 La 3 Zr 1.5 Ta 0.5 o 12 , 0.042 g triethanolamine, 0.054 g dibutyl phthalate, 0.054 g polyethylene glycol, 0.06 g polyvinyl butyral, and 4.32...

Embodiment 3

[0056] Accurately weighed 7.2 g Li 6 La 3 Ta 1.5 Y 0.5 o 12 and 1.6 g polyethersulfone (PESf), then add 7.2 g N, N-dimethylpyrrolidone (NMP) and put it in an agate ball mill jar, and ball mill for 4 hours to obtain a uniform viscous slurry, which is transferred to a test tube, Use a glass rod with a diameter of about 0.6 cm to impregnate the slurry, pull it out, and rotate it at a constant speed. After the thickness is uniform, quickly soak it in pure water to undergo a phase inversion process. After soaking for 20 minutes, take out the glass rod to obtain a closed end. The tubular green body was finally sintered at 1050 °C for 24 h at a heating rate of 1 °C / min to obtain a tubular porous ceramic support with one end closed. The support body is 8 cm long and 1.0 cm in outer diameter.

[0057] Accurately weighed 1.47 g Li 6 La 3 Ta 1.5 Y 0.5 o 12 , 0.042 g triethanolamine, 0.054 g dibutyl phthalate, 0.054 g polyethylene glycol, 0.06 g polyvinyl butyral, and 4.32 g eth...

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Abstract

The invention discloses an all-solid-state lithium-air battery and its preparation method and application. The all-solid-state lithium-air battery provided by the invention includes a lithium metal anode, a porous ceramic support, a dense electrolyte film, a porous cathode film, a sealing material, a current collector and a lead; a garnet-type lithium-ion solid electrolyte material is used to make the porous support The air electrode catalyst and lithium metal anode penetrate into the pores to expand the three-phase interface of the battery reaction and reduce the battery polarization resistance; the thickness of the battery electrolyte film is less than 30 μm, shortening the lithium ion transmission path and reducing the battery ohmic resistance; the battery is closed at one end The tubular structure has a lithium metal anode perfused in the tube. The battery is easy to seal and easy to work under different conditions. The all-solid-state lithium-air battery prepared by the invention has the advantages of high charge and discharge capacity, good rate performance, high cycle stability, wide operating temperature range, etc., and is suitable for various mobile electronic equipment and power battery fields.

Description

technical field [0001] The invention relates to a lithium-air battery, in particular to an all-solid lithium-air battery and its preparation method and application, belonging to the field of high-performance chemical power sources. Background technique [0002] At present, the main source of power for small and medium-sized cars is the combustion of diesel and gasoline. However, with the depletion of oil resources and the deterioration of environmental problems, people urgently need to find a green energy alternative. Among the many green energy alternatives at present, lithium-ion batteries have rapidly replaced lead-acid, nickel-cadmium, and nickel-metal hydride in recent years due to their relatively high energy density, good rate performance, cycle stability, and no memory effect. Batteries have become the most popular high-energy power batteries in the electric vehicle market. [0003] A lithium-air battery is a battery that uses oxygen as the positive electrode active...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M12/06
CPCH01M12/06
Inventor 金超杨瑞枝王章俊罗勇
Owner SUZHOU UNIV
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