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Gel polymer electrolyte for lithium-air battery and preparation method thereof

A lithium-air battery and gel polymer technology, applied in secondary batteries, fuel cell half-cells, secondary battery-type half-cells, circuits, etc., can solve the problems of poor battery cycle stability and achieve excellent stability Improvement of performance and multiplier performance, and reduction of production cost

Inactive Publication Date: 2015-10-28
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above-mentioned gel polymer electrolytes can be used in lithium-air batteries and exhibit good water and gas barrier properties, during the charging and discharging process of the battery, the above-mentioned polymer substrates will be destroyed by superoxide radicals. Ions (O 2- ) induces a degradation reaction, which leads to poor cycle stability of the battery

Method used

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  • Gel polymer electrolyte for lithium-air battery and preparation method thereof
  • Gel polymer electrolyte for lithium-air battery and preparation method thereof
  • Gel polymer electrolyte for lithium-air battery and preparation method thereof

Examples

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Embodiment 1

[0039]In this embodiment, the perfluoropolymer electrolyte substrate in the gel polymer electrolyte for lithium-air batteries is a perfluorosulfonic acid polymer electrolyte substrate Nafion (produced by Dupont, USA) prepared by a solvent casting process. The thickness is 52 μm, and the organic solvent is dimethyl sulfoxide (DMSO).

[0040] The preparation method of the polymer electrolyte for the lithium-air battery in this embodiment is as follows:

[0041] (1) First prepare a certain concentration of lithium hydroxide solution, place the perfluoropolymer electrolyte substrate in the lithium hydroxide solution for lithiation treatment, then wash with deionized water several times, and after drying, the obtained Perfluoropolymer electrolyte substrate containing lithium ions;

[0042] (2) preparing the electrolyte solution whose concentration of lithium salt is 0.1-3mol / L;

[0043] (3) Soak the lithium-ion-containing perfluoropolymer electrolyte base material prepared in ste...

Embodiment 2

[0052] In this embodiment, the perfluoropolymer electrolyte substrate in the gel polymer electrolyte for lithium-air batteries is a perfluorosulfonic acid polymer electrolyte substrate Nafion (produced by Dupont, USA) prepared by a solvent casting process. The thickness is 52 μm, and the organic solvent is sulfolane.

[0053] The preparation method of the gel polymer electrolyte for the lithium-air battery in this embodiment is as follows:

[0054] (1) First prepare a certain concentration of lithium hydroxide solution, place the perfluoropolymer electrolyte substrate in the lithium hydroxide solution for lithiation treatment, then wash with deionized water several times, and after drying, the obtained Perfluoropolymer electrolyte substrate containing lithium ions;

[0055] (2) preparing the electrolyte solution whose concentration of lithium salt is 0.1-3mol / L;

[0056] (3) Soak the lithium-ion-containing perfluoropolymer electrolyte base material prepared in step (1) in th...

Embodiment 3

[0063] In this embodiment, the perfluoropolymer electrolyte substrate in the gel polymer electrolyte for lithium-air batteries is a perfluorosulfonic acid polymer electrolyte substrate Nafion (produced by Dupont, USA) prepared by a melt extrusion process. The thickness is 130 μm, and the organic solvent is diphenyl sulfoxide.

[0064] The preparation method of the gel polymer electrolyte for the lithium-air battery in this embodiment is as follows:

[0065] (1) First prepare a certain concentration of lithium hydroxide solution, place the perfluoropolymer electrolyte substrate in the lithium hydroxide solution for lithiation treatment, then wash with deionized water several times, and after drying, the obtained Perfluoropolymer electrolyte substrate containing lithium ions;

[0066] (2) preparing the electrolyte solution whose concentration of lithium salt is 0.1-3mol / L;

[0067] (3) Soak the lithium-ion-containing perfluoropolymer electrolyte base material prepared in step ...

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Abstract

The invention relates to a gel polymer electrolyte for a lithium-air battery and a preparation method thereof. The electrolyte is composed of perfluocarbon polymer electrolyte base materials with lithium ions and an electrolyte solution, wherein the perfluocarbon polymer electrolyte base materials account for 30-80% of the percentage mass content of the electrolyte; when the gel polymer electrolyte is prepared, the perfluocarbon polymer electrolyte base materials are placed in a lithium hydroxide solution to be subjected to lithiation treatment, washing is conducted, after drying is conducted, the treated perfluocarbon polymer electrolyte base materials are steeped in the electrolyte solution, full swelling is conducted, and then the gel polymer electrolyte for the lithium-air battery is prepared. Compared with the prior art, according to the gel polymer electrolyte for the lithium-air battery, prominent and excellent chemical stability can be achieved, the nucleophilic attack of superoxide ions in the lithium-air battery can be effectively resisted, and therefore prominent improvement effects on the battery capacity, the rate capacity and the cycling stability are achieved.

Description

technical field [0001] The invention belongs to the technical field of electrochemical energy materials, and in particular relates to a gel polymer electrolyte for a lithium-air battery and a preparation method thereof. Background technique [0002] With the massive consumption of fossil fuels, global environmental pollution and energy crisis are becoming more and more serious, it is urgent to develop clean and efficient new energy storage battery technology. The chemical power source directly converts chemical energy into electrical energy, and outputs electrical energy stably by consuming certain chemical substances. It is one of the most promising energy storage systems. [0003] Li-air batteries are a new class of high-performance green energy storage batteries. It uses metal lithium as the anode and oxygen in the air as the cathode active material. Due to its ultra-high theoretical energy density (up to 11140Wh / kg), low material cost, and environmental friendliness, i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565H01M12/08
CPCH01M10/0565H01M12/08Y02E60/10
Inventor 王海滨李磊吴朝鲁门廖晨博许庆凯
Owner SHANGHAI JIAO TONG UNIV
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