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Sulfo group polymer electrolyte, as well as in-situ preparation method and application thereof

An in-situ preparation and polymer technology, applied in the field of electrochemistry, can solve the problems of hidden danger of charging, high reactivity, easy volatility, etc., and achieve the effect of satisfying high-current charging and discharging, improving safety performance, and improving thermal stability.

Active Publication Date: 2017-05-31
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the organic liquid electrolyte used in lithium-ion batteries makes lithium-ion batteries have potential safety hazards. For example, the main component of liquid electrolytes is carbonates, which are volatile, flammable, and highly reactive. Even the potential safety hazard of explosion, and in the organic liquid electrolyte, lithium salt needs to be added to conduct lithium ions. However, in order to improve the solubility of lithium salt in the electrolyte, lithium salts generally have large anions, which makes lithium ions larger than anions. It is easier to solvate, causing the migration number of lithium ions to be only about 0.3, and serious polarization occurs during charging and discharging, so there is a safety hazard in the charging process

Method used

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  • Sulfo group polymer electrolyte, as well as in-situ preparation method and application thereof
  • Sulfo group polymer electrolyte, as well as in-situ preparation method and application thereof
  • Sulfo group polymer electrolyte, as well as in-situ preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Dissolve 5g of polyvinylidene fluoride powder in 45g of N-methylpyrrolidone, after completely dissolving, add 5g of 3-mercaptopropyltrimethoxysilane, stir to make it evenly mixed, take 0.5mL and spread it on 25.4mm× Place on a 76.2mm glass slide and dry in a vacuum oven at 80°C for 12h. That is, a polymer film containing -SH groups is obtained.

[0031] The prepared polymer film containing -SH groups was immersed in 35% H 2 o 2 In the solution, oxidize at 65°C for 6h while hydrolyzing the silane to obtain a surface containing -SO 3 HSiO2 For the inorganic-organic composite polymer membrane, take out the composite polymer membrane and wash it three times with deionized water. The pretreated composite polymer membrane was then placed in 0.2M H 2 SO 4 The solution was acidified for 1 hour, rinsed with deionized water three times, and then the membrane was put into water and boiled for 1 hour. The acidified composite polymer membrane was then placed in 1M CH 3 Lithiu...

Embodiment 2

[0033] Dissolve 5g of polyvinylidene fluoride-hexafluoropropylene copolymer powder in 45g of N-methylpyrrolidone, after completely dissolving, add 5g of 3-mercaptopropyltrimethoxysilane, and simultaneously add 2g of 10% HNO 3 , to promote the hydrolysis of 3-mercaptopropyltrimethoxysilane, and at the same time play the role of preliminary oxidation. After stirring to make it fully uniform, take 0.5mL and spread it on a 25.4mm×76.2mm glass slide. 1. Under the condition of relative humidity of 50% RH, dry in a vacuum oven at 80° C. for 12 hours. That is, a polymer film containing -SH groups is obtained.

[0034] The prepared polymer film containing -SH groups was immersed in 35% H 2 o 2 In the solution, oxidize at 65°C for 6h while hydrolyzing the silane to obtain a surface containing -SO 3 H SiO 2 For the inorganic-organic composite polymer membrane, take out the composite polymer membrane and wash it three times with deionized water. The pretreated composite polymer membr...

Embodiment 3

[0038] Dissolve 5g of polyvinylidene fluoride powder in 45g of N-methylpyrrolidone, after completely dissolving, add 5g of 3-mercaptopropyltrimethoxysilane, add 1g of 100nm aluminum oxide, stir to make it fully uniform, then take 0.5mL was coated on a 25.4mm×76.2mm glass slide, and dried in a vacuum oven at 80°C for 12h. That is, a polymer film containing -SH groups is obtained.

[0039] The prepared polymer film containing -SH groups was immersed in 35% H 2 o 2 In the solution, oxidize at 65°C for 6h while hydrolyzing the silane to obtain a surface containing -SO 3 H SiO 2 For the inorganic-organic composite polymer membrane, take out the composite polymer membrane and wash it three times with deionized water. The pretreated composite polymer membrane was then placed in 0.2M H 2 SO 4 The solution was acidified for 1 hour, rinsed with deionized water three times, and then the membrane was put into water and boiled for 1 hour. The acidified composite polymer membrane was...

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Abstract

The invention provides a sulfo group polymer electrolyte, as well as an in-situ preparation method and an application thereof. The preparation method comprises the following steps: dissolving a polymer in a dissolvent; adding a silane coupling agent containing -SH; ultrasonically removing air bubbles from the system and forming a film; soaking into an oxidant solution; oxidizing the -SH terminal into a sulfo group, and meanwhile, hydrolyzing by using the silane coupling agent and generating SiO2; after cleaning, putting into an acid solution for acidizing; after taking out, washing with deionized water; boiling with water and removing the residual acid; putting into a lithium exchange solution for exchanging lithium, cleaning and drying, thereby acquiring a lithium sulfate-containing polymer electrolyte membrane. The thermal stability and the electrochemical properties of the prepared sulfo group polymer electrolyte are promoted; the sulfo group polymer electrolyte can be applied to an electrochemical power source system, such as, a lithium ion battery and can meet the requirement of large current charge and discharge of the lithium ion battery; an effect of a single ion conductor is achieved; and the safety performance of the battery is promoted.

Description

technical field [0001] The invention relates to the field of electrochemistry, in particular to a sulfonic acid-based polymer electrolyte and its in-situ preparation method and application. Background technique [0002] Lithium-ion battery has the characteristics of high specific energy, high power, no memory effect, and environmental friendliness. It is a green chemical power source with good portability. It has been widely used in mobile digital products and As well as medical equipment such as pacemakers and ventilators, and military equipment such as drones. However, the organic liquid electrolyte used in lithium-ion batteries makes lithium-ion batteries have potential safety hazards. For example, the main component of liquid electrolytes is carbonates, which are volatile, flammable, and highly reactive. Even the potential safety hazard of explosion, and in the organic liquid electrolyte, lithium salt needs to be added to conduct lithium ions. However, in order to impro...

Claims

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Application Information

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IPC IPC(8): H01M10/0564H01M10/0565
CPCH01M10/0564H01M10/0565Y02E60/10
Inventor 赵金保张鹏李超
Owner XIAMEN UNIV
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