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Functional diaphragm of lithium-sulfur battery and preparation method thereof

A lithium-sulfur battery, functional technology, applied in the field of functional diaphragm and its preparation, can solve the problems of low utilization rate of active material, low utilization rate of active material, reduction of battery mass energy density, etc., to reduce the shuttle effect and improve the battery life. Chemical properties, effect of improving dispersion transfer efficiency

Inactive Publication Date: 2019-06-18
INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the large-scale application of lithium-sulfur batteries is still limited, mainly due to the low utilization of active materials and poor cycle life.
Therefore, the development of commercial lithium-sulfur batteries urgently needs to address the following two main issues: 1. Sulfur and its discharge products (L 2 S 2 / Li 2 S) Poor electrical conductivity, resulting in low active material utilization; 2. Sulfide (Li 2 Sx, 2<x≤8) dissolves in the electrolyte, leading to fast capacity fading and low Coulombic efficiency
However, these modification methods will increase the weight of the battery to a certain extent and reduce the mass energy density of the battery.

Method used

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  • Functional diaphragm of lithium-sulfur battery and preparation method thereof
  • Functional diaphragm of lithium-sulfur battery and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0023] (1) Preparation of metal organic framework material MIL-125(Ti):

[0024] First measure 30mL of N,N-dimethylformamide and 8mL of methanol, mix well, take 3g of phthalic acid and dissolve in the mixed solvent, ultrasonicate for 60 minutes, add 8mL of tetrabutyl titanate, ultrasonicate for 60 minutes, and then The solution was placed in a polytetrafluoroethylene-lined reactor and reacted at 130°C for 24h. After the reaction was completed, the product was cooled to room temperature with the furnace, and the product was collected by centrifugation, washed repeatedly with deionized water three times, and finally put the washed product in a vacuum drying oven at 60°C for 24 hours to obtain the metal organic framework material MIL-125(Ti).

[0025] (2) Preparation of amino functionalized metal organic framework material MIL-125(Ti):

[0026] Take 0.8g of metal-organic framework material MIL-125(Ti) prepared in step (1), 2g of p-phenylenediamine, dissolve in 150mL of deionized...

Embodiment 2

[0032] (1) Preparation of metal organic framework material MIL-125(Ti):

[0033] First measure 20mL of N,N-dimethylformamide and 5mL of methanol, mix well, take 2g of phthalic acid and dissolve it in the mixed solvent, sonicate for 30 minutes, add 5mL of tetrabutyl titanate, sonicate for 30 minutes, then mix the above The solution was placed in a polytetrafluoroethylene-lined reactor at 120°C for 24h. After the reaction was completed, the product was cooled to room temperature with the furnace, and the product was collected by centrifugation, washed repeatedly with deionized water three times, and finally the washed product was placed in a vacuum drying oven at 50°C for 12 hours to obtain the metal-organic framework material MIL-125(Ti).

[0034] (2) Preparation of amino functionalized metal organic framework material MIL-125(Ti):

[0035] Take 0.5g of metal-organic framework material MIL-125(Ti) prepared in step (1), 1g of p-phenylenediamine, dissolve in 100mL of deionized w...

Embodiment 3

[0039] (1) Preparation of metal organic framework material MIL-125(Ti):

[0040] First measure 50mL of N,N-dimethylformamide and 10mL of methanol, mix well, take 5g of phthalic acid and dissolve it in the mixed solvent, ultrasonicate for 60 minutes, add 10mL of tetrabutyl titanate, ultrasonicate for 60 minutes, and then The solution was placed in a polytetrafluoroethylene-lined reactor and reacted at 150°C for 48h. After the reaction was completed, the product was cooled to room temperature with the furnace, and the product was collected by centrifugation, washed repeatedly with deionized water three times, and finally put the washed product in a vacuum drying oven at 80°C for 24 hours to obtain the metal organic framework material MIL-125(Ti).

[0041] (2) Preparation of amino functionalized metal organic framework material MIL-125(Ti):

[0042] Take 1g of metal-organic framework material MIL-125(Ti) prepared in step (1), 3g of p-phenylenediamine, dissolve in 200mL of deioni...

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Abstract

The invention relates to a functional diaphragm of a lithium-sulfur battery, in particular to a functional diaphragm which is modified by amino functionalization by adopting a metal organic frameworkmaterial MIL-125. The preparation method of the diaphragm comprises the following steps: dissolving a proper amount of metal organic framework material MIL-125 and p-phenylenediamine in the deionizedwater, adding isoamyl nitrite, stirring for 12-24 h at the temperature of 50-80 DEG C, and obtaining an amino functional metal organic framework material MIL-125 after the washing and drying; the amino functional metal organic framework material MIL-125, a conductive agent super p and binder polyvinylidene fluoride being in a mass ratio of 8:1:1, grinding and dispersing, adding 1-methyl-2-pyrrolidone (NMP) solution until the powder becomes black and viscous, and coating the black and viscous powder on the commonly used diaphragm 2400 to obtain the functional diaphragm. The prepared functionaldiaphragm has a porous structure, and can inhibit the diffusion of polysulfide through physical adsorption, reduce the shuttle effect, and improve the dispersion transfer efficiency, thereby improvingthe conductivity.

Description

technical field [0001] The technical solution of the present invention relates to a functional diaphragm for lithium-sulfur batteries and a preparation method thereof, in particular to a method for preparing amino-functionalized metal-organic framework material MIL-125 (Ti) modified lithium-sulfur battery functional diaphragms . Background technique [0002] With the development of portable electronic devices, electric vehicles, and smart grids, the demand for rechargeable energy storage systems is increasing. Lithium-sulfur batteries have a high theoretical specific capacity (1675 mAh g -1 ) and high theoretical specific density (2600 Wh kg -1 ) has received extensive attention. In addition, sulfur also has the advantages of abundant reserves, low price, and non-toxicity. However, the large-scale application of lithium-sulfur batteries is still limited, mainly due to the low utilization rate of active materials and poor cycle life. Therefore, the development of commerc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16
CPCY02E60/10
Inventor 张永光王加义
Owner INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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