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Lithium ion solid electrolyte thin film and application thereof

A solid electrolyte, lithium ion technology, applied in circuits, fuel cells, electrical components, etc., can solve problems such as insufficient density of solid electrolyte films, adverse effects on lithium battery performance, and unfavorable lithium uniform deposition, and achieve high current stability. The effect of charging and discharging cycle, realizing large-scale batch production, and simple and environmentally friendly preparation method

Active Publication Date: 2019-06-21
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This kind of composite solid electrolyte film is dominated by gel electrolyte in composition, which makes the solid electrolyte film have problems such as insufficient density and poor mechanical strength.
In addition, in the composite process of PEO and solid electrolyte, uneven distribution and poor surface flatness are prone to occur, which is not conducive to the uniform deposition of lithium during the discharge process, thus adversely affecting the performance of lithium batteries

Method used

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  • Lithium ion solid electrolyte thin film and application thereof
  • Lithium ion solid electrolyte thin film and application thereof
  • Lithium ion solid electrolyte thin film and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Accurately weigh 2.5 g of polyethersulfone powder (PESf) and 30 ml of N,N-dimethylpyrrolidone (NMP) into an agate ball mill jar, seal and let stand for 15 minutes to obtain a homogeneous polymer solution, and then add 25 g of Li 1.4 Al 0.4 Ti 1.6 (PO 4 ) 3 (LATP) solid electrolyte powder, sealed and quickly ball milled for 3 hours to obtain a uniform viscous slurry, then transferred to a vacuum oven at room temperature for 3 minutes to remove the air bubbles in the mixed slurry, and then used a coating machine to coat the mixed slurry at a speed of 5m / min (Casting film slurry) evenly coated on the aluminum foil, spray 5mL deionized water evenly on the aluminum foil with an airbrush for pre-curing, then soak it in 50mL deionized water, take it out after 12h, wash and dry with alcohol Obtain the LATP lithium-ion solid-state electrolyte base film separated from the aluminum foil, which is called a pure film in the accompanying drawings, and the following examples are t...

Embodiment 2

[0047] Accurately weigh 4 g of polyethersulfone powder (PESf) and 45 ml of N, N-dimethylpyrrolidone (NMP) into an agate ball mill jar, seal and let stand for 15 minutes to obtain a homogeneous polymer solution, and then add 30 g of Li 6.6 La 3 Zr 1.6 Ta 0.4 o 12 (LLZTO) solid electrolyte powder, sealed and quickly ball milled for 3 hours to obtain a uniform viscous slurry, then transferred to a vacuum oven at room temperature for 3 minutes to remove the air bubbles in the mixed slurry, and then used a coating machine to coat the mixed slurry at a speed of 5m / min Evenly coated on the aluminum foil, use a spray pen to spray 5mL alcohol evenly on the aluminum foil for pre-curing, then soak it in 50mL deionized water, take it out after 12h, wash and dry with alcohol to get the LLZTO lithium ion solid electrolyte base membrane.

[0048] The above-mentioned LLZTO lithium-ion solid-state electrolyte base film was immersed in 5 mL of an alcohol solution of 15-crown-5 lithium iodid...

Embodiment 3

[0052] Accurately weigh 2.5 g of polyacrylonitrile powder (PAN) and 30 ml of N,N-dimethylformamide (DMF) into an agate ball mill jar, seal and let stand for 15 minutes to obtain a homogeneous polymer solution, and then add 30 g of Li 6.6 La 3 Zr 1.6 Ta 0.4 o 12 (LLZTO) solid electrolyte powder, sealed and quickly ball milled for 3 hours to obtain a uniform viscous slurry, then transferred to a room temperature vacuum oven for 3 minutes to remove the air bubbles in the mixed slurry, and then used a coating machine to coat the mixed slurry at a speed of 5m / min Apply evenly on the aluminum foil, spray 5mL of isopropanol onto the aluminum foil with an airbrush for pre-curing, then soak it in 50mL of isopropanol, take it out after 12 hours, wash and dry with alcohol to obtain a lithium-ion solid electrolyte basement membrane.

[0053] The above-mentioned LLZTO lithium-ion solid-state electrolyte base film was immersed in an alcohol solution of 12-crown-4 lithium iodide with a ...

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Abstract

The invention belongs to the field of solid-state lithium batteries, and particularly discloses a lithium ion solid electrolyte thin film and an application thereof, and can be used for preparing a secondary solid lithium battery. The lithium ion solid electrolyte thin film is composed of 60-90wt% of lithium ion solid electrolyte ceramic powder, 5-20wt% of phase change agent and 5-20wt% of crown ether lithium salt. The lithium ion solid electrolyte thin film is prepared by adopting a phase change technology, a coating method and a solution impregnation method. Compared with a common lithium ion solid electrolyte thin film, the lithium ion solid electrolyte thin film disclosed by the invention has the advantages that the composition is mainly composed of ceramic powder, does not contain a polymer gel electrolyte and is free of sintering, so that that the thin film is high in ionic conductivity, the lithium metal is stable, the electrochemical window is wide, the high temperature resistance is high, the preparation is simple, and the thickness is uniform and controllable, and the like. The lithium ion solid electrolyte thin film can be used for preparing a secondary solid lithium-airbattery and a solid lithium ion battery.

Description

technical field [0001] The invention belongs to the field of solid-state lithium batteries, and in particular relates to a lithium-ion solid-state electrolyte film and its application, which can be used to prepare secondary solid-state lithium batteries. Background technique [0002] With the rapid development of electric vehicles and portable electronic products, lithium batteries with higher energy density have become one of the research hotspots in the field of power batteries and energy storage. However, the current commercial lithium-ion batteries all use organic electrolytes, which have limitations and potential safety hazards during use. Compared with liquid electrolytes, solid electrolytes have better mechanical strength, thermal stability, and safety, and can inhibit the growth of lithium dendrites. Therefore, using solid lithium ion electrolytes to make solid secondary lithium batteries has become a new trend in the development of lithium batteries. [0003] Howe...

Claims

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Application Information

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IPC IPC(8): H01M10/056H01M10/0525H01M8/1016H01M12/08
CPCY02E60/10Y02E60/50
Inventor 金超杨瑞枝潘晓伟孙家文沈力炜
Owner SUZHOU UNIV
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