Flexible lithium lanthanum titanyl ceramic nanofiber membrane and preparation method thereof

A nanofiber membrane, lithium lanthanum titanium oxide technology, applied in fiber treatment, heating/cooling fabrics, electrical components, etc., can solve the problem of poor compatibility between ceramic electrolyte and electrode interface, reduced battery coulombic efficiency and life, complex preparation process, etc. problems, to achieve the effect of rich raw materials, increased electronic conductivity, and low material synthesis temperature

Active Publication Date: 2018-12-21
DONGHUA UNIV
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  • Claims
  • Application Information

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Problems solved by technology

For example, the SEI film cannot withstand the growth and volume change of lithium dendrites, and it is constantly broken and repaired during the cycle, resulting in a decrease in the Coulombic efficiency and life of the battery; the existing ceramic solid electrolyte preparation process is complex, energy consumption is large, and ceramic Electrolyte and electrode interface compatibility is poor

Method used

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  • Flexible lithium lanthanum titanyl ceramic nanofiber membrane and preparation method thereof
  • Flexible lithium lanthanum titanyl ceramic nanofiber membrane and preparation method thereof
  • Flexible lithium lanthanum titanyl ceramic nanofiber membrane and preparation method thereof

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Embodiment 1

[0039] A flexible lithium lanthanum titanium oxide ceramic nanofiber membrane is composed of lithium lanthanum titanium oxide nanofibers, and the structural formula of the lithium lanthanum titanium oxide compound is Li 3x La 2 / 3-x TiO 3 , where X is 0.11.

[0040] The preparation method of the above-mentioned flexible lithium lanthanum titania ceramic nanofiber membrane, the specific steps are:

[0041] Step 1: Prepare a precursor solution consisting of lithium source, lanthanum source, titanium source, polymer and volatile organic solvent: dissolve the polymer polyethylene oxide (Aladdin, 600,000) in Solvent glacial acetic acid and N,N-dimethylformamide (the molar ratio of glacial acetic acid and N,N-dimethylformamide is 3:1) and stirred for 60min, then added lithium source lithium chloride, lanthanum source chlorine Lanthanum chloride and titanium source tetrabutyl titanate were stirred for 120 minutes and mixed evenly to prepare a precursor solution, wherein the molar r...

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Abstract

The invention provides a flexible lithium lanthanum titanyl ceramic nanofiber membrane. The membrane is characterized in that a preparation method comprises the steps that a precursor solution composed of a lithium source, a lanthanum source, a titanium source, a high-molecular polymer and a volatile organic solvent is prepared and subjected to electrospinning to form the nanofiber membrane, the nanofiber membrane is calcined in an air atmosphere, the molar ratio of the lithium source to the lanthanum source to the titanium source is 3X:(<2 / 3>-X):1, wherein X is larger than or equal to 0.04 and less than or equal to 0.17. The flexible ceramic nanofiber membrane can serve as a solid electrolyte to be applied to the field of all-solid metal lithium batteries, and can also be used as protective film of metal lithium electrodes to be applied to the field of liquid metal lithium batteries.

Description

technical field [0001] The invention belongs to the field of new energy materials and technologies, and relates to a flexible lithium lanthanum titanium oxide (Li 3x La 3 / 2-x TiO 3 ) ceramic nanofiber membrane and a preparation method thereof, which can be used in the fields of solid metal lithium batteries and liquid metal lithium batteries. Background technique [0002] In recent years, due to the high theoretical capacity (3840mA h g -1 ), the lowest electrochemical potential (-3.04V vs standard hydrogen electrode), and excellent electrical conductivity, have attracted extensive attention from the scientific and industrial communities, and become a very promising electrode material for lithium batteries. However, during the charging and discharging process of the liquid battery, the Li + The deposition is uneven, and a large number of lithium dendrites are generated on the metal lithium electrode. On the one hand, the growth of dendrites can easily pierce the separat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D04H1/728D04H1/413D06C7/00D01D5/00H01M10/0562H01M4/36H01M4/62H01M10/0525
CPCD01D5/0038D04H1/413D04H1/728D06C7/00H01M4/366H01M4/628H01M10/0525H01M10/0562H01M2300/0071Y02E60/10
Inventor 闫建华赵云丁彬俞建勇
Owner DONGHUA UNIV
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