Method for preparing polymer electrolyte for improving self-discharge of lithium-sulfur battery and application

A lithium-sulfur battery and electrolyte technology, which is applied in the preparation and application of single-ion conductor polymer electrolytes, can solve the problems that affect the stability of lithium negative electrodes, the electrochemical stability of batteries, the large pores of polyolefin diaphragms, and the flammability of liquid electrolytes. Achieve the effect of avoiding self-discharge phenomenon, reducing battery cost, and low raw material cost

Inactive Publication Date: 2019-03-29
DONGGUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the polyolefin separator has large and uneven pores, which can easily cause a micro-short circuit due to the contact between the positive and negative electrodes inside the battery; the liquid electrolyte has a large fluidity, and the ether electrolyte has a large resistance to polysulfide ions. Solubility, so polysulfide ions are easily dissolved in the electrolyte and migrate to the negative electrode side, affecting the stability of the lithium negative electrode and the electrochemical stability of the battery; liquid electrolytes have safety hazards such as flammability and leakage

Method used

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  • Method for preparing polymer electrolyte for improving self-discharge of lithium-sulfur battery and application
  • Method for preparing polymer electrolyte for improving self-discharge of lithium-sulfur battery and application

Examples

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Embodiment 1

[0039] Polymer electrolyte material and preparation method of sulfonated polystyrene lithium and polyvinylidene fluoride-hexafluoropropylene copolymer. The specific raw materials and preparation process of the single ion conductor polymer electrolyte are as follows:

[0040] (1) sulfonated polystyrene and lithium hydroxide solution are mixed, react until sulfonated polystyrene lithium;

[0041] (2) prepare a certain amount of N,N-dimethylformamide;

[0042] (3) Take the prepared sulfonated polystyrene lithium and polyvinylidene fluoride-hexafluoropropylene copolymer according to the molar ratio of 1:10; then the sulfonated polystyrene lithium and polyvinylidene fluoride-hexafluoropropylene The copolymer is added to a certain amount of N,N-dimethylformamide, stirred and dissolved to obtain a uniform transparent solution;

[0043] (4) Use a scraper to pour a transparent solution on the surface of a clean glass plate, then apply it with a scraper, place it at room temperature f...

Embodiment 2

[0047] Polymer electrolyte material and preparation method of lithium polyalkylmethacrylate sulfonate and polyvinylidene fluoride. The specific raw materials and preparation process of the single ion conductor polymer electrolyte are as follows:

[0048] (1) polyalkylmethacrylate sulfonic acid and lithium hydroxide solution are mixed, and reaction obtains polyalkylmethacrylate sulfonate lithium;

[0049] (2) prepare a certain amount of N,N-dimethylacetamide;

[0050] (3) Take the prepared lithium polyalkyl methacrylate sulfonate and polyvinylidene fluoride according to a molar ratio of 1:20; then add lithium polyalkyl methacrylate sulfonate and polyvinylidene fluoride to a certain amount Amount of N,N-dimethylacetamide, stirred and dissolved to obtain a uniform transparent solution;

[0051] (4) Spread the transparent solution on a smooth glass plate by pouring, and then carry out the process of placing it at room temperature for 24 hours to dry naturally, and then drying it...

Embodiment 3

[0055] Polymer electrolyte material and preparation method of hyperbranched lithium polyurethane containing sulfonic acid groups and polyethylene oxide. The specific raw materials and preparation process of the single ion conductor polymer electrolyte are as follows:

[0056] (1) the hyperbranched polyurethane containing sulfonic acid group is mixed with lithium sulfate solution, and the reaction obtains the hyperbranched polyurethane lithium containing sulfonic acid group;

[0057] (2) prepare a certain amount of N-methylpyrrolidone amine;

[0058] (3) Take the prepared hyperbranched polyurethane lithium and polyethylene oxide containing sulfonic acid groups according to a molar ratio of 1:30; then add a certain amount of hyperbranched polyurethane lithium and polyethylene oxide containing sulfonic acid groups Amount of N-methylpyrrolidone amine, stirred and dissolved to obtain a uniform transparent solution;

[0059] (4) Using the micro-concave transfer coating process to ...

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Abstract

The invention discloses a method for preparing polymer electrolyte for improving self-discharge of a lithium-sulfur battery and an application and provides a novel polymer electrolyte material and a preparation method of the same. The polymer electrolyte includes sulfonic acid lithium salt, high molecular polymer, solvent and plasticizer. Efficient chemical properties can be achieved, dendritic and shuttle problems of batteries in the prior art are avoided, the preparation method is simple and environmentally friendly, and the material can be made to achieve good mechanical properties and heatresistance properties. The polymer electrolyte is advantaged in that the polymer electrolyte is applied to the field of the lithium-sulfur battery.

Description

technical field [0001] The invention belongs to the field of internal electrolyte materials of lithium-sulfur batteries, and relates to electrolyte materials and preparation methods thereof, in particular to the preparation and application of a single-ion conductor polymer electrolyte for improving the self-discharge of lithium-sulfur batteries. technical background [0002] Lithium-sulfur battery is a new type of battery whose theoretical specific energy is much higher than that of traditional lithium-ion batteries. The theoretical specific capacity of lithium-sulfur batteries with sulfur as the active material can reach 1675 mAh per gram, and the energy density can reach 2600 Wh per kilogram, which is much higher than the existing traditional lithium-ion batteries. At the same time, sulfur is abundant in nature, environmentally friendly and cheap. These advantages make lithium-sulfur batteries stand out and become a research hotspot for next-generation high-energy lithium...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/058H01M10/0568H01M10/0525
CPCH01M10/0525H01M10/0568H01M10/058H01M2300/0025Y02E60/10Y02P70/50
Inventor 王延青刘志宏李辰范洪波段若蒙赵雁飞
Owner DONGGUAN UNIV OF TECH
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