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Lithium-sulfur battery separator material, preparation method thereof and application thereof

A technology of lithium-sulfur batteries and diaphragm materials, which is applied in the direction of lithium batteries, battery pack components, non-aqueous electrolyte batteries, etc., can solve the problems of blocked lithium ion transmission channels, poor cycle performance of lithium-sulfur batteries, and low coulombic efficiency, and achieve improved Coulombic efficiency and cycle stability, good electrochemical advantages, and simple preparation method

Inactive Publication Date: 2019-07-12
YANGZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the discharge process of lithium-sulfur batteries, elemental sulfur is reduced to S -2 There will be multiple intermediate states generated during the process, where Li 2 Sn (4≤n≤8) is easily soluble in the organic electrolyte, shuttles from the sulfur positive electrode to the lithium negative electrode through the separator, forms an insulating layer on the lithium negative electrode, reduces the contact between the lithium negative electrode and the separator, and blocks the transmission channel of lithium ions, resulting in Lithium-sulfur batteries have problems such as poor cycle performance, low Coulombic efficiency, and high self-discharge rate, which delay the pace of their practical application

Method used

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  • Lithium-sulfur battery separator material, preparation method thereof and application thereof
  • Lithium-sulfur battery separator material, preparation method thereof and application thereof
  • Lithium-sulfur battery separator material, preparation method thereof and application thereof

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preparation example Construction

[0019] The preparation method of composite material of the present invention, comprises the steps:

[0020] Dissolve a certain amount of PW12 powder in a certain amount of DMF solution, and magnetically stir for several minutes until the PW12 12 The powder is completely dissolved to form a uniform and transparent mixed solution, and then a certain amount of PVDF powder is dissolved in the mixed solution, heated in an oil bath, stirred, and left to stand to prepare a uniform spinning solution, which is placed on the PP film through an electrospinning machine , dried in vacuum to obtain a new type of PW 12 / PVDF spun diaphragm composite.

Embodiment 1

[0022] 1) Preparation of PW 12 / Spinning solution for PVDF spinning diaphragm material:

[0023] Take 0.75gPW 12 Dissolve in 5mL DMF solution, heat the oil bath at 50°C, stir magnetically for 5 h, then add 0.5g PVDF powder, stir magnetically for 3 h at 50°C to form a uniform and transparent spinning solution, and let it stand for several minutes to prepare for static electricity Spinning use.

[0024] Select a certain amount of PW in this step 12 , DMF and PVDF, under these conditions can form a uniform spinning solution with a certain viscosity; control the heating temperature is for PW 12 , DMF and PVDF are better dissolved together to speed up the reaction, too high or too low temperature will have a great impact on the prepared spinning solution.

[0025] 2) Preparation of PW 12 / PVDF spinning diaphragm material:

[0026] The PW obtained in step 1) 12 / PVDF spinning diaphragm material spinning solution, by using an electrospinning machine, the distance between the s...

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Abstract

The invention discloses a lithium-sulfur battery separator material, a preparation method and application thereof. The lithium-sulfur battery separator material is obtained by loading a polyoxometallate-phosphoric acid and polyvinylidene fluoride onto a PP film of a lithium-sulfur battery separator. The prepared lithium-sulfur battery separator material has good electrochemical advantages, phosphotungstic acid can be easily loaded on a conventional PP film, a one-dimensional fiber has uniform morphology, a lithium-ion transmission space is provided, the transmission speed of lithium ions is facilitated, polysulfide can be effectively prevented from flowing to a negative electrode of a lithium-sulfur battery, therefore, the effects of improving the coulombic efficiency and cycle stability of the battery are achieved, the preparation method is simple, and the operation is simple.

Description

technical field [0001] The invention belongs to the field of chemical batteries, and in particular relates to a lithium-sulfur battery diaphragm material, a preparation method and an application thereof. Background technique [0002] With the increasing depletion of fossil fuels and the increasingly serious environmental problems caused by their combustion, it is urgent to find new energy sources. At the same time, the rapid development of portable devices such as mobile phones, notebook computers, digital cameras, and electric vehicles, and the Secondary batteries are widely used. Among them, lithium-ion secondary batteries, which appeared in the 1990s, are a new generation of chemical power sources recognized in the world, and have been successfully commercialized and rapidly developed in the field of portable devices. However, in the fields of electric vehicles, aerospace and national defense equipment, the current commercial lithium-ion secondary batteries are limited b...

Claims

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Application Information

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IPC IPC(8): H01M2/14H01M2/16H01M10/052H01M50/403H01M50/411
CPCH01M10/052H01M50/403H01M50/411H01M50/44H01M50/449Y02E60/10
Inventor 倪鲁彬段素芹杨光王伟刁国旺崔玉荃马志远顾杰刘逸
Owner YANGZHOU UNIV
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