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Double-layer solid electrolyte composite membrane mainly composed of polyacrylonitrile and preparation method and application thereof

A technology of solid electrolyte and polyacrylonitrile, which is applied in the direction of solid electrolyte, electrolyte battery manufacturing, non-aqueous electrolyte, etc., can solve the problems of low conductivity and poor mechanical properties, achieve good repeatability, simple operation, and improve Coulombic efficiency Effect

Active Publication Date: 2019-03-26
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The object of the present invention is to provide a double-layer solid electrolyte composite membrane with polyacrylonitrile as the main body and its Preparation method and application as electrolyte in preparation of lithium-sulfur gel electrolyte battery, preparation of electrolyte with high ionic conductivity, high mechanical properties and good interfacial contact performance

Method used

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  • Double-layer solid electrolyte composite membrane mainly composed of polyacrylonitrile and preparation method and application thereof
  • Double-layer solid electrolyte composite membrane mainly composed of polyacrylonitrile and preparation method and application thereof
  • Double-layer solid electrolyte composite membrane mainly composed of polyacrylonitrile and preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] 1) Dissolve PAN, PEO and LATP in DMF in a certain proportion, and magnetically stir to form a homogeneous solution. The mass ratio of PAN to PEO is 1:1, and LATP is 10% of the sum of the mass of PAN and PEO;

[0042] 2) Apply the homogeneous solution obtained in step 1) on a glass plate with a scraper, and dry it at 60°C for 10 minutes to obtain the first layer of electrolyte, which is named PPL electrolyte layer;

[0043] 3) Dissolve PAN and LATP in DMF in a certain proportion, and magnetically stir to form a homogeneous solution. The LATP is 10% of the mass of PAN; the resulting solution is scraped and coated on the PPL electrolyte layer obtained in step 2) with a scraper to obtain a PL electrolyte layer;

[0044] 4) Put the double-layer electrolyte obtained in step 3) in a vacuum drying oven at 60°C for 12 hours in a vacuum to obtain a double-layer solid electrolyte composite membrane (ie, a double-layer solid electrolyte composite membrane mainly composed of polyacr...

Embodiment 2

[0050] 1) Dissolve PAN, PEO and LATP in DMF in a certain proportion, and magnetically stir to form a homogeneous solution. The ratio of PAN to PEO mass is 1:1, and LATP is 20% of the sum of PAN and PEO mass;

[0051] 2) Apply the solution obtained in step 1) on a glass plate with a scraper, and dry at 60°C for 10 minutes to obtain the first layer of PPL electrolyte;

[0052] 3) Dissolve PAN and LATP in DMF in a certain proportion, and magnetically stir to form a homogeneous solution. The LATP is 20% of the mass of PAN; the solution obtained above is scraped and coated on the PPL electrolyte layer obtained in step 2) with a scraper to obtain the PL electrolyte layer;

[0053] 4) The double-layer electrolyte obtained in step 3) was vacuum-dried in a vacuum oven at 60° C. for 12 hours to obtain a composite film of double-layer solid electrolyte, called PPL-PL. The thickness of this electrolyte is 25 μm±1.

[0054] 5) The gel polymer electrolyte material is punched into a disc ...

Embodiment 3

[0057] 1) Dissolve PAN, PEO and LATP in DMF in a certain proportion, and magnetically stir to form a homogeneous solution. The ratio of PAN to PEO mass is 1:1, and LATP is 30% of the sum of PAN and PEO mass;

[0058] 2) Apply the solution obtained in step 1) on a glass plate with a scraper, and dry at 60°C for 10 minutes to obtain the first layer of PPL electrolyte;

[0059] 3) Dissolve PAN and LATP in DMF in a certain proportion, and magnetically stir to form a homogeneous solution. The LATP is 30% of the mass of PAN; the solution obtained above is scraped and coated on the PPL electrolyte layer obtained in step 2) with a scraper to obtain the PL electrolyte layer;

[0060] 4) The double-layer electrolyte obtained in step 3) was vacuum-dried in a vacuum oven at 60° C. for 12 hours to obtain a composite film of double-layer solid electrolyte, called PPL-PL. The thickness of this electrolyte is 25 μm±1.

[0061] 5) The gel polymer electrolyte material is punched into a disc ...

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Abstract

The invention discloses a double-layer solid electrolyte composite membrane mainly composed of polyacrylonitrile, a preparation method thereof and application of the double-layer solid electrolyte composite membrane as an electrolyte in preparation of a lithium-sulfur gel electrolyte battery. The preparation method comprises the following steps of: dissolving PAN (polyacrylonitrile), PEO (polyoxyethylene) and LATP (Li1.3Al0.3Ti1.7(PO3)4) in DMF (N,N-dimethylformamide), stirring, then applying a mixture on a glass plate in a scraping manner by using a scraping knife, and drying to obtain a first layer of electrolyte; dissolving the PAN and the LATP in the DMF, stirring, then applying a mixture on the first layer of electrolyte in a scraping manner by using the scraping knife to obtain a second layer of electrolyte; and carrying out vacuum drying to obtain the double-layer solid electrolyte composite membrane mainly composed of the polyacrylonitrile. The obtained material is directly sliced to serve as the electrolyte of the lithium-sulfur battery. The method has simple preparation process, large yield and low cost, can be used for large-scale production, and facilitates the realization of industrialization. The double-layer solid electrolyte composite membrane prepared by the method is applied in the lithium-sulfur total battery, can suppress the shuttling effect, improves the battery capacity, and has a good cycle performance.

Description

technical field [0001] The invention relates to the technical field of electrolyte materials, in particular to a double-layer solid electrolyte composite membrane mainly composed of polyacrylonitrile, a preparation method thereof, and an application as an electrolyte in the preparation of a lithium-sulfur gel electrolyte battery. Background technique [0002] Currently, commercial lithium-ion batteries are based on LiFePO 4 , LiC O o 2 and LiMn 2 o 4 etc. as the positive pole, and the carbon material as the negative pole. Lithium-ion batteries are widely used in portable electronic devices and electric vehicles. However, due to the low energy density (<300Wh kg -1 ) and potential safety issues pose greater challenges to lithium-ion batteries. On the other hand, lithium-sulfur batteries have a high theoretical capacity (1675mAhg -1 ) and energy density (2600Whkg -1 ), these performances are 5-10 times that of conventional Li-ion batteries. In addition, sulfur is ...

Claims

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Application Information

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IPC IPC(8): H01M10/058H01M10/0565
CPCH01M10/0565H01M10/058H01M2300/0082Y02E60/10Y02P70/50
Inventor 王秀丽郝晓靖夏新辉涂江平
Owner ZHEJIANG UNIV
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