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A method of preparing for lithium sulfur battery diaphragm based on multi -layer aramal nano fiber

A nanofiber, lithium-sulfur battery technology, applied in lithium batteries, battery pack components, non-aqueous electrolyte batteries, etc., can solve the problems of lithium-sulfur batteries shuttle, lithium dendrite batteries safety, hidden dangers, etc., to improve electrochemical performance. Stability, to ensure safe use, to achieve the effect of ion selectivity

Active Publication Date: 2022-08-09
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the serious problems of lithium-sulfur battery shuttling, the growth of lithium dendrites poses safety hazards to the battery, and provide a lithium-sulfur battery separator based on multi-layer aramid nanofibers that can efficiently inhibit polysulfide shuttling. Preparation

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  • A method of preparing for lithium sulfur battery diaphragm based on multi -layer aramal nano fiber
  • A method of preparing for lithium sulfur battery diaphragm based on multi -layer aramal nano fiber
  • A method of preparing for lithium sulfur battery diaphragm based on multi -layer aramal nano fiber

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specific Embodiment approach 1

[0018] Embodiment 1: This embodiment describes a method for preparing a lithium-sulfur battery separator based on multi-layer aramid nanofibers. The method is:

[0019] Step 1: Preparation of Aramid Nanofiber Solution:

[0020] Add the aramid fiber into the sealed dimethyl sulfoxide silk-neck bottle, add potassium hydroxide, and react at room temperature with magnetic stirring for 2 weeks, until the aramid fiber is completely dissolved and the solution is dark red, that is, the aramid fiber is completed. Preparation of fiber nanofiber solution;

[0021] Step 2: Preparation of Multilayer Aramid Nanofiber Separator:

[0022] The aramid nanofiber solution obtained in step 1 was dropped on the rectangular glass sheet, and the rectangular glass sheet was rotated at a speed of 1500r / min for 30s, so that the aramid nanofiber solution was uniformly coated on the surface of the rectangular glass sheet, and the rectangular glass sheet was uniformly coated. The glass sheet was soaked i...

specific Embodiment approach 2

[0023] Embodiment 2: The method for preparing a lithium-sulfur battery separator based on multi-layer aramid nanofibers described in Embodiment 1, in step 1, the aramid fibers, dimethyl sulfoxide and potassium hydroxide are prepared The mass ratio is 2:98:3.

specific Embodiment approach 3

[0024] Embodiment 3: The method for preparing a lithium-sulfur battery separator based on multi-layer aramid nanofibers described in Embodiment 1. In step 2, every 1-5 mL of aramid nanofiber solution is added dropwise to a length × width of 60~80mm×30~50mm rectangular glass sheet.

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Abstract

A preparation method of a lithium-sulfur battery separator based on multi-layer aramid nanofibers belongs to the technical field of separator preparation. The purpose of the present invention is to solve the current lithium-sulfur battery shuttle phenomenon is serious, the growth of lithium dendrites has potential safety hazards to the battery and the like, the method is: adding aramid fiber to the sealed dimethyl sulfoxide silk mouth bottle , add potassium hydroxide, and react with magnetic stirring for 2 weeks at room temperature; drop the aramid nanofiber solution on the rectangular glass plate, rotate for 30s, and soak in deionized water at the same time, until the dimethyl sulfoxide is completely removed Then, drying in an oven, then soaking the diaphragm in a 0.1 wt% PDDA solution for 30s, taking it out, rinsing the excess PDDA solution, drying in an oven, and repeating the above suspension coating-soaking-suspension coating operation in sequence. The separator prepared by the invention has super strong mechanical properties (tensile strength 165MPa, tensile modulus: 9.2GPa), which can effectively inhibit the growth of dendrites and ensure the safe use of the battery.

Description

technical field [0001] The invention belongs to the technical field of separator preparation, and in particular relates to a preparation method of a lithium-sulfur battery separator based on multi-layer aramid nanofibers. Background technique [0002] Lithium-ion batteries are widely used in people's daily life. With the development of society, traditional lithium-ion batteries have been far from meeting people's demand for energy storage. Lithium-sulfur batteries (Li-S) are regarded as one of the most promising high-capacity storage systems due to their high theoretical specific capacity and energy density, as well as the low cost and environmental friendliness of sulfur. However, there are still some technical challenges for the commercial application of Li-S batteries, such as the insulating properties of solid sulfides, the shuttle effect of soluble long-chain polysulfides, and the large volume change of sulfur during charge and discharge. These problems often lead to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M50/403H01M50/494H01M50/44H01M50/491H01M50/414H01M10/052
CPCH01M10/052H01M50/411H01M50/44H01M50/403H01M50/449Y02E60/10
Inventor 王明强黄玉东刘丽王春艳
Owner HARBIN INST OF TECH