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Thin type layered composite solid electrolyte membrane and preparation method and application thereof

A solid electrolyte membrane, layered composite technology, applied in circuits, electrical components, secondary batteries, etc., can solve the problems of discontinuous grains, large grain boundary impedance, limiting membrane processing, etc., and achieve regular and continuous arrangement orientation, The effect of improving energy density and good interlayer channel

Active Publication Date: 2021-05-25
ZHENGZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, due to the inherent brittleness of the above solid electrolyte membrane, discontinuous internal grains, and large grain boundary resistance, the ionic conductivity of the prepared membrane is low and fragile; the low ionic conductivity requires the membrane to be processed at a higher temperature use, causing the battery to fail to work at low temperatures
Due to the poor mechanical properties, the battery operation requirements of the assembly are more stringent
In addition, the inherent poor mechanical properties of ceramic electrolyte membranes also limit the processing and long-term operation of the membranes.

Method used

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  • Thin type layered composite solid electrolyte membrane and preparation method and application thereof
  • Thin type layered composite solid electrolyte membrane and preparation method and application thereof
  • Thin type layered composite solid electrolyte membrane and preparation method and application thereof

Examples

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Embodiment 1

[0040] A preparation method of a thin layered composite solid electrolyte membrane, the preparation method comprising the following steps:

[0041] 1) Using thermally expanded vermiculite as a raw material, vermiculite nanosheets were prepared by a two-step ion exchange method. The specific experimental steps are as follows: add 2 g of heat-expandable vermiculite (particle size: 8-13 mm) to saturated NaCl solution, stir magnetically at 120 ° C for 48 hours, and then wash with deionized water for 5 times to obtain the expanded vermiculite intercalated with sodium ions. Then, the expanded vermiculite intercalated with sodium ions was continued to reflux in 2M LiCl solution for 24 hours (oil bath temperature: 120°C), then filtered and washed 5 times with deionized water and 3 times with absolute ethanol until No Cl was detected in the filtrate - So far, the expanded vermiculite with lithium ion intercalation is obtained; take 0.5g of expanded vermiculite with lithium ion interca...

Embodiment 2

[0045] In step 1), take 125mL of the vermiculite nanosheet dispersion and add it to a suction filtration device for suction filtration, and the remaining steps and parameters are the same as in Example 1. A thin layered composite solid electrolyte membrane with a film thickness of 100 μm was prepared, which was designated as Membrane-2.

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Abstract

The invention belongs to the technical field of all-solid-state lithium batteries, and discloses a thin type layered composite solid electrolyte membrane and a preparation method and application thereof, and the preparation method comprises the following steps: 1) preparing a two-dimensional nanosheet layered membrane from a two-dimensional nanosheet; 2) inserting an inorganic ceramic electrolyte between layers of the two-dimensional nanosheet layered film; and 3) coating polyoxyethylene on the surface of the layered membrane obtained in the step 2) to obtain the thin layered composite solid electrolyte membrane. The thin layered composite solid electrolyte membrane prepared by the invention shows more excellent lithium ion conductivity and mechanical properties than a traditional electrolyte membrane.

Description

technical field [0001] The invention belongs to the technical field of all-solid-state lithium batteries, and in particular relates to a thin layered composite solid-state electrolyte membrane and a preparation method and application thereof. Background technique [0002] Lithium metal batteries are generally regarded as the most promising secondary energy storage devices due to their high energy density. However, traditional lithium metal batteries with liquid electrolytes have serious safety hazards, such as electrolyte leakage, combustion, and even explosion caused by lithium dendrite growth. Solid electrolytes have attracted more and more attention because they can effectively solve the safety problems of liquid electrolytes, but their low conductivity, poor mechanical stability, and low energy density limit the practical application of all-solid-state metal lithium batteries. A qualified all-solid lithium battery should have the following characteristics: First, the li...

Claims

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Application Information

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IPC IPC(8): H01M10/0562H01M10/0525
CPCH01M10/0525H01M10/0562Y02E60/10
Inventor 王景涛李文鹏武文佳张婕吕睿鑫
Owner ZHENGZHOU UNIV
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