Functionalized ionic liquid/S-C composite material and preparation method and composite cathode material thereof

An ionic liquid and composite material technology, which is applied in the fields of functionalized ionic liquid/S-C composite materials and their preparation, and composite cathode materials, can solve the problems of cycle capacity decay, high self-discharge, low Coulombic efficiency, etc. Long life effect

Active Publication Date: 2018-09-28
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its cathode materials still have certain problems, such as poor electrical conductivity, and inevitable polysulfide migration, which will cause serious capacity fading, low Coulombic efficiency, and high self-discharge, etc.
[0003] During the charging and discharging process, the negative electrode active material polysulfide (Li 2 S x ) will migrate to the lithium negative electrode, and react with the lithium negative electrode to form insoluble sulfide, which is deposited on the surface of the lithium negative electrode (dissecting the cycled battery, it is found that there is a dense layer of sulfide deposition on the surface of the lithium electrode), which seriously affects the lithium battery. The activity of the electrode and the conduction of lithium ions lead to a gradual decline in the cycle capacity

Method used

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  • Functionalized ionic liquid/S-C composite material and preparation method and composite cathode material thereof
  • Functionalized ionic liquid/S-C composite material and preparation method and composite cathode material thereof
  • Functionalized ionic liquid/S-C composite material and preparation method and composite cathode material thereof

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Embodiment 1

[0041] The functionalized ionic liquid of the present embodiment comprises ionic liquid and SiO 2 ; The ionic liquid is 1-methyl-1-propyl (trimethoxysilane) piperidinium chloride. Ionic Liquids and SiO 2 The mass ratio is 2:3. The functionalized ionic liquid is composed of the above-mentioned ionic liquid and SiO 2 Composite.

[0042] The preparation method of the functionalized ionic liquid of the present embodiment comprises the following steps:

[0043] 1) Add 3.96g of N-Methyl piperidine and 8.73g of 3-chloropropyl trimethoxysilane to the organic solvent dimethylformamide (dimethylformamide) and mix reaction. Specifically, the reaction is to react at 80°C for 72h under the protection of an inert atmosphere; then the mixed system after the reaction is extracted with ethyl acetate, and the 1-methyl-1-propyl(trimethoxysilane)piperene produced by the reaction The pyridinium chloride precipitated in the mixed system; then the solvent and extractant were removed by evapora...

Embodiment 2

[0052] The functionalized ionic liquid of the present embodiment comprises ionic liquid and SiO 2 ; The ionic liquid is 1-methyl-1-propyl (trimethoxysilane) piperidinium chloride. Ionic Liquids and SiO 2 The mass ratio is 1:1. The functionalized ionic liquid is composed of the above-mentioned ionic liquid and SiO 2 Composite.

[0053] The preparation method of the functionalized ionic liquid of the present embodiment comprises the following steps:

[0054] 1) Add 3.5g of N-Methyl piperidine and 8g of 3-chloropropyl trimethoxysilane to the organic solvent dimethylformamide (dimethylformamide) for mixed reaction Specifically, the reaction is to react at 70°C for 48h under the protection of an inert atmosphere; then the mixed system after the reaction is extracted with ethyl acetate, and the 1-methyl-1-propyl (trimethoxysilane) produced by the reaction Piperidinium chloride precipitated in the mixed system; then evaporated with a rotary evaporator for 8h to remove the solven...

Embodiment 3

[0063] The functionalized ionic liquid of the present embodiment comprises ionic liquid and SiO 2 ; The ionic liquid is 1-methyl-1-propyl (trimethoxysilane) piperidinium chloride. Ionic Liquids and SiO 2 The mass ratio is 3.5:4. The functionalized ionic liquid is composed of the above-mentioned ionic liquid and SiO 2 Composite.

[0064] The preparation method of the functionalized ionic liquid of the present embodiment comprises the following steps:

[0065] 1) Add 4.8g of N-Methyl piperidine and 9.6g of 3-chloropropyl trimethoxysilane to the organic solvent dimethylformamide (dimethylformamide) and mix Reaction, specifically, the reaction is to react at 90°C for 60h under the protection of an inert atmosphere; then the mixed system after the reaction is extracted with ethyl acetate, and the 1-methyl-1-propyl (trimethoxysilane) produced by the reaction ) piperidinium chloride was precipitated in the mixed system; then the solvent and extractant were removed by evaporation...

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Abstract

The invention relates to a functionalized ionic liquid/S-C composite material and a preparation method and a composite cathode material thereof, and belongs to the technical field of flow battery. Thefunctionalized ionic liquid comprises an ionic liquid and SiO2. The ionic liquid is 1-methyl-1-propyl(trimethoxy silane)piperidine onium chloride. In the invention, the ionic liquid (SiO2-PPCl) functionalized sulfur supernatant solution flow electrode is used as the cathode of a lithium-sulfur flow battery. During charge-discharge process, an active substance polysulfide can react with a functional group in SiO2-PPCl to form a bond so as to inhibit migration of polysulfide to lithium anode. During charge-discharge process, the ionic liquid is also helpful for helpful for reducing electrochemical polarization and promoting conversion between active substances.

Description

technical field [0001] The invention relates to a functionalized ionic liquid / S-C composite material and a preparation method thereof, a composite positive electrode material for a battery, and a battery, and belongs to the technical field of liquid flow batteries. Background technique [0002] Lithium-sulfur flow batteries are considered to be the most promising energy storage batteries in the field of large-scale energy storage, and have good application prospects in solar and wind power generation systems. Among different chemical energy storage devices, redox flow batteries have attracted attention due to their operational flexibility and easy scalability. Lithium-sulfur flow battery not only has the advantages of high energy density, clean and environmental protection of lithium-sulfur battery, but also has the characteristics of flow battery, which is a very promising energy storage technology. However, their cathode materials still have certain problems, such as poor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36
CPCH01M4/362Y02E60/10
Inventor 张锁江徐松程源源张兰张香平
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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