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Method for preparing beta-Al2O3 ceramic electrolyte separator for sodium battery

A ceramic electrolyte and sodium battery technology, which is applied in ceramic molding machines, battery components, circuits, etc., can solve the problem of difficulty in realizing special-shaped, complex structure electrolyte diaphragm preparation, affecting electrolyte conductivity and mechanical properties, and difficult densification of ceramic diaphragms and other problems to achieve the effect of low matching precision requirements, ensuring consistency and reducing pollution

Active Publication Date: 2015-04-29
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

[0006] However, the above-mentioned gel injection molding and casting method need to add a large amount of organic additives, which not only pollutes the environment, increases the cost, but also makes it difficult for the ceramic diaphragm to be densified during the sintering process (relative density is less than 98% T.D.), affecting the electrolyte. Electrical conductivity and mechanical properties
In addition, the casting method is limited to the preparation of sheet-type diaphragms, and it is not easy to realize the preparation of special-shaped and complex-structured electrolyte diaphragms.

Method used

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  • Method for preparing beta-Al2O3 ceramic electrolyte separator for sodium battery

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preparation example Construction

[0032] Preparation of beta-Al for sodium batteries of the present invention 2 o 3 The method for the ceramic electrolyte membrane includes step (1): respectively synthesizing Na-Z powder and Li-Z powder as precursor powder based on an Al source and a Na source, and an Al source and a Li source.

[0033] In one embodiment of the present invention, in this step (1), alpha-Al can be used 2 o 3 as Al source. and can use Na 2 CO 3 、Na 2 C 2 o 4 Any one of NaOH and NaOH is used as Na source. and can adopt Li 2 CO 3 , Li 2 C 2 o 4 and any one of LiOH as the Li source. Thereby, desired Na-Z powder and Li-Z powder which are precursor powders can be efficiently synthesized. However, the present invention is not limited thereto, and other sources of Al, Na and Li can also be used.

[0034] Further, in this step (1), after the Al source is mixed with the Na source and the Li source according to the specified molar ratio, the planetary ball mill is used for 2-6h, Preferabl...

Embodiment 1

[0052] Weigh a certain amount of alpha-Al respectively 2 o 3 、Na 2 C 2 o 4 , Li 2 C 2 o 4 , according to the molar ratio Al 2 o 3 : Na 2 O=5:1, Al 2 o 3 : Li 2O=5:1 for batching, with absolute ethanol as the medium, planetary ball mill for 4 hours, dried and sieved, pre-calcined at 700°C for 4 hours, and then sintered at 1250°C for 2 hours to obtain Na-Z powder and Li-Z Powder. According to molar ratio Na-Z:Li-Z=6:1 batching, and the PVB that adds 2wt% is made binder, is solvent with dehydrated alcohol, prepares slurry 5, controls the consumption of dehydrated alcohol, makes slurry 5 had a solids content of 36 wt%. Fix the hemispherical tubular metal mandrel 1 on the fastening device 2, and turn on the motor of the driving device 4, and drive the forming mandrel 1 to rotate through the pulley 3, and the speed is controlled to 100r / min; the solid content is 36wt%. The slurry 5 is carried by a 3MPa high-pressure gas, and is sprayed from the high-pressure nozzle 6 ...

Embodiment 2

[0054] Weigh a certain amount of alpha-Al respectively 2 o 3 、Na 2 C 2 o 4 , Li 2 C 2 o 4 , according to the molar ratio Al 2 o 3 : Na 2 O=4.5:1, Al 2 o 3 : Li 2 O=4.5:1 for batching, with absolute ethanol as the medium, planetary ball mill for 4 hours, dried and sieved, pre-calcined at 700°C for 4 hours, and then sintered at 1250°C for 2 hours to obtain Na-Z powder and Li-Z Powder. According to molar ratio Na-Z:Li-Z=6:1 batching, and the PVB that adds 3wt% is made binder, is solvent with dehydrated alcohol, prepares slurry 5, controls the consumption of dehydrated alcohol, makes slurry 5 had a solids content of 36 wt%. Fix the four-leaf clover-shaped metal mandrel 1 on the fastening device 2, and turn on the motor of the driving device 4, and drive the forming mandrel 1 to rotate through the pulley 3, and the speed is controlled at 100r / min; the slurry with a solid content of 36wt% 5. Through the 5MPa high-pressure gas carrier, spray from the high-pressure nozz...

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Abstract

The invention provides a method for preparing a beta-Al2O3 ceramic electrolyte separator for a sodium battery. The method comprises steps as follows: Step (1), Na-Z powder and Li-Z powder which are used as precursor powder are synthesized respectively on the basis of an Al source and a Na source as well as on the basis of the Al source and an Li source; Step (2), the Na-Z powder and the Li-Z powder are mixed in the specified mole ratio and mixed with a binder and a solvent, and then slurry is prepared; Step (3), the slurry is atomized and then sprayed onto a rotating mandrel to be condensed and molded into a base body; Step (4), the condensed and molded base body is sleeved with a plastic film, and a beta-Al2O3 biscuit is obtained through demolding after isostatic pressing machining; Step (5), the beta-Al2O3 biscuit is subjected to plastic removal and then high-temperature sintering, and the beta-Al2O3 ceramic electrolyte separator is obtained.

Description

technical field [0001] The invention relates to a method for forming an electrolyte diaphragm for a sodium battery, in particular to a method for preparing a beta-Al membrane for a sodium battery 2 o 3 method for ceramic electrolyte membranes. Background technique [0002] Beta-Al 2 o 3 Na of ceramics at room temperature + Ionic conductivity up to 10 -2 The order of magnitude of S / cm is the currently known Na + The solid electrolyte material system with the highest ionic conductivity, which plays the role of Na in sodium batteries + The dual role of ion conductor and positive and negative separator is the core component of various electrochemical devices such as sodium batteries. [0003] With the rise of research on sodium batteries, especially sodium-sulfur batteries and sodium-chloride batteries, the research on beta-Al 2 o 3 The shape, thickness and performance of the electrolyte separator put forward higher requirements. On the one hand, in order to reduce the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/10C04B35/622B28B21/44H01M2/16H01M50/403H01M50/434
CPCY02E60/10
Inventor 温兆银吴相伟吴梅芬胡英瑛张敬超
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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