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Diaphragm for lithium-air battery and preparation method thereof

A lithium-air battery and separator technology, applied in battery pack parts, circuits, electrical components, etc., can solve problems such as unsatisfactory performance, slow lithium ion passing, hindering the high performance of lithium-air batteries, and achieve good chemical stability. mechanical properties, the effect of avoiding contact with moisture and lithium metal

Inactive Publication Date: 2010-05-12
青岛生物能源与过程研究所
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0022] However, the performance of the key material in the new lithium-air battery, the diaphragm, is not ideal, and there are shortcomings such as slow lithium ion passage and poor mechanical properties, which seriously hinder the high performance of the lithium-air battery.

Method used

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  • Diaphragm for lithium-air battery and preparation method thereof
  • Diaphragm for lithium-air battery and preparation method thereof
  • Diaphragm for lithium-air battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] TiO 2 (7.99g), NH 4 h 2 PO 4 (11.5g) and LiH 2 PO 4 (5.2g) mixed well and ball milled for 5 hours (h), then in air atmosphere at 2°C min -1 Raise the temperature to 600°C at a certain rate, keep it warm for 24 hours, then raise the temperature of the sample to 1000°C, keep it warm for 48 hours, and after natural cooling, grind the product finely to obtain LiTi 2 (PO 4 ) 3 sample. place the sample in 10MPa / cm in the steel mold 2 The pressure is pressed into a disc with a thickness of 1mm, and the pressed sheet is sintered at 800°C for about 10h to obtain a composition of LiTi 2 (PO 4 ) 3 Solid lithium ion conductor.

[0050] Mix 0.70g of PVDF-HFP, 8.6mL of acetone, and 0.7mL of water, and stir in a magnetic stirrer at 70°C until completely dissolved. After dissolving, stir for another 15 minutes to obtain a clear and viscous sol, which is coated on one surface of the solid lithium ion conductor while still hot with a 600 μm spatula. After drying at room t...

Embodiment 2

[0052] NH 4 h 2 PO 4 At 100°C, Li 2 CO 3 , SiO 2 、Al 2 o 3 、TiO 2 and other components such as MgO at 200 ° C to constant weight, stored in a desiccator; according to NH 4 h 2 PO 4 (11.5g), Li 2 CO 3 (2.59g), SiO 2 (0.32g), Al 2 o 3 (0.255g), TiO 2 (7.2g), and MgO (0.28g), fully ground in an agate mortar and moved into a corundum crucible, placed the crucible containing the reactant in a high-temperature furnace and heated it at 170°C and 700°C for 4h respectively, and then heated it at 900°C ℃ heating for 20h to complete the reaction. place the sample in 10MPa / cm in the steel mold 2 The pressure is pressed into a disc, and the pressed sheet is sintered at 800 ° C for about 10 hours to obtain a composition of Li 1.4 Al 0.1 Mg 0.1 Ti 1.8 Si 0.1 P 2.9 o 12 The solid lithium ion conductor is then combined with the polymer film in Example 1 to prepare a three-layer sandwich structure.

Embodiment 3

[0054] La 2 o 3 (16.3g), Li 2 CO 3 (3.69g), TiO 2 (7.85g) is moved into corundum crucible after fully grinding in agate mortar, the crucible that reactant is housed is placed in high-temperature furnace and is kept at 800 ℃ in air atmosphere for 4 hours, and then is kept at 1350 ℃ for 12 hours. The obtained sample is ground finely, placed in a steel mold at 10MPa / cm 2 The pressure is pressed into a disc with a thickness of 1 mm and a diameter of 2 cm, and the pressed sheet is sintered at 1350 ° C for 6 hours and then cooled to room temperature to obtain a composition of Li 0.34 La 0.51 TiO 2.94 The inorganic lithium solid conductor is then compounded with the polymer film in Example 1 to prepare a three-layer sandwich structure.

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Abstract

The invention discloses a diaphragm for a lithium-air battery, which has a three-layer sandwich structure, wherein an intermediate layer is a solid lithium fast ion conductor which takes LiM2-xNx(PO4)3 or NaM2-xNx(PO4)3 (x is more than or equal to 0 and is less than or equal to 0.8, M is Ti, and N is one of elements such as Ge, Al, Si, Ga and the like) as a matrix; and both sides of the diaphragm are provided with a layer of organic polymer porous film or inorganic-organic composite diaphragm of the LiM2-xNx(PO4)3 or NaM2-xNx(PO4)3 (the x is more than or equal to 0 and is less than or equal to 0.8) lithium fast ion conductor with nanometer particles and an organic polymer respectively. The invention also provides a method for preparing the diaphragm for the lithium-air battery. The diaphragm has quick lithium ion passing performance, isolates an organic electrolyte and an aqueous electrolyte at the same time, prevents the moisture from contacting metal lithium to produce the hazard or generate inert substances to stop the reaction, and has good mechanical property at the same time.

Description

technical field [0001] The invention belongs to the technical field of lithium-air batteries, and in particular relates to a lithium-air battery diaphragm and a preparation method. The diaphragm has lithium fast ion passing performance, and at the same time isolates an organic electrolyte and an aqueous electrolyte to avoid danger or inertness caused by water contacting metal lithium Substances (LiOH, Li 2 O, etc.) to prevent the reaction, while the film has good mechanical properties. Background technique [0002] With the continuous development of economy and society, energy and environmental problems are becoming more and more serious. Energy saving and emission reduction and the development of new energy and efficient energy devices are important issues in today's society. In the past two decades, batteries based on lithium metal have dominated the development of high-performance batteries, because lithium metal has the lowest density, the highest voltage, the best elec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M50/403H01M50/411H01M50/431H01M50/457
CPCY02E60/12Y02E60/10
Inventor 崔光磊刘志宏王海波陈骁韩鹏献
Owner 青岛生物能源与过程研究所
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