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Thermally crosslinked polyvinyl alcohol/polyacrylic acid lithium fiber separator for fast lithium ion transport and its preparation and application

A technology of polyacrylic fiber and lithium polyacrylate, applied in fiber processing, fiber type, heating/cooling fabric, etc., can solve the problem that lithium dendrite cannot be effectively inhibited in the shuttle effect of lithium-sulfur battery, and achieve a fast and efficient preparation method, Stable physical and chemical properties and excellent mechanical properties

Active Publication Date: 2022-03-04
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the commercial battery separators on the market are mainly polyolefin separators. The chemical properties of these separators are relatively stable, but they cannot effectively suppress the shuttle effect and lithium dendrites inside lithium-sulfur batteries, so there are still many problems in practical applications. disadvantages

Method used

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  • Thermally crosslinked polyvinyl alcohol/polyacrylic acid lithium fiber separator for fast lithium ion transport and its preparation and application
  • Thermally crosslinked polyvinyl alcohol/polyacrylic acid lithium fiber separator for fast lithium ion transport and its preparation and application
  • Thermally crosslinked polyvinyl alcohol/polyacrylic acid lithium fiber separator for fast lithium ion transport and its preparation and application

Examples

Experimental program
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Effect test

Embodiment 1

[0042] This example provides a thermally cross-linked polyvinyl alcohol / polyacrylic acid lithium fiber separator for fast lithium ion transmission, and the specific preparation steps are as follows:

[0043]Step 1: Prepare polyvinyl alcohol / polyacrylic acid composite nanofibers by electrospinning:

[0044] Using deionized water as solvent, weigh polyvinyl alcohol (sigma-aldrich, 341584-500G), polyacrylic acid (sigma-aldrich, 181285-100G) and deionized water at a mass ratio of 5:7.5:87.5; Vinyl alcohol was added to deionized water, placed on a stirring table and stirred at 97°C for 6 hours at a speed of 700r / min to obtain a polyvinyl alcohol solution; after cooling to room temperature, the weighed polyacrylic acid was added, and the Stir at room temperature for 18 hours at a rotating speed, and then stand still for 6 hours to obtain a mixed spinning solution; take 5mL of the mixed spinning solution and pour it into a 5mL syringe to control the amount of spun fibers; the spinnin...

Embodiment 2

[0053] Similar to the thermally crosslinked polyvinyl alcohol / polyacrylic acid lithium fiber separator for fast lithium ion transport in Example 1, the difference is that the ratio of polyvinyl alcohol, polyacrylic acid and deionized water in Example 1 is changed to 4:8.5 : 87.5, the resulting product is marked as a thermally crosslinked polyvinyl alcohol / polyacrylic acid lithium fiber separator-1 for fast lithium ion transport.

Embodiment 3

[0055] Similar to the thermally crosslinked polyvinyl alcohol / polyacrylic acid lithium fiber separator for fast lithium ion transport in Example 1, the difference is that the heat treatment conditions in step 2 are 140 degrees Celsius and 2 hours, and the obtained product is recorded as fast lithium ion transport Thermally cross-linked polyvinyl alcohol / lithium polyacrylate fiber separator-2.

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Abstract

The invention discloses a heat-crosslinked polyvinyl alcohol / polyacrylic acid lithium fiber separator for fast lithium ion transmission and its preparation method and application. Composite fiber membrane; thermally cross-linked polyvinyl alcohol / polyacrylic acid composite fiber diaphragm is obtained by heat treatment; finally, LiOH aqueous solution is used for lithiation treatment to obtain thermally cross-linked polyvinyl alcohol / polyacrylic acid lithium fiber diaphragm with fast lithium ion transmission. The invention adopts the thermal cross-linking method to process the electrospun polyvinyl alcohol / polyacrylic acid composite fiber membrane, so that the mechanical strength and the stability in the aqueous solution of the composite membrane are greatly enhanced. Then use LiOH solution to treat the composite fiber separator to change the unreacted polyacrylic acid on the surface of the fiber into lithium polyacrylate, which greatly improves the lithium ion conductivity of the composite fiber separator while ensuring the electrostatic repulsion to lithium polysulfide.

Description

technical field [0001] The invention belongs to the technical field of composite fiber diaphragms, and in particular relates to the preparation of a heat-crosslinked polyvinyl alcohol / polyacrylic acid lithium fiber diaphragm for rapid lithium ion transmission and its application in lithium-sulfur batteries. Background technique [0002] Lithium-sulfur (Li-S) batteries due to their ultra-high theoretical specific energy (2600W h kg -1 ) and theoretical specific capacity (1672mAh g -1 ) has been favored by the majority of researchers, and sulfur has many advantages such as abundant reserves, low cost, and no pollution to the environment, and has become one of the most promising new rechargeable battery systems. In the charging and discharging process of lithium-sulfur batteries, due to the multi-level electrochemical reaction characteristics of sulfur, the high specific capacity characteristics of sulfur cathode materials are brought, but at the same time, it leads to more co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D06M11/38D01F8/10D04H1/728D01D5/00D06C7/00H01M50/44H01M50/414H01M10/052D06M101/24D06M101/26
CPCD06M11/38D01F8/10D04H1/728D01D5/003D06C7/00H01M10/052H01M50/411H01M50/44Y02E60/10
Inventor 缪月娥朱晓波朱鑫国陈嘉伟刘天西欧阳玥宗伟
Owner DONGHUA UNIV