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Porous polymer electrolyte supporting membrane material, preparation method thereof and application thereof

A porous polymer and electrolyte technology, applied in circuits, secondary batteries, electrical components, etc., can solve the problems of restricting the commercialization process of lithium-sulfur batteries, low utilization rate of positive active materials, low battery safety, etc. Solubility, operation and environmental requirements are not harsh, and the effect of wide electrochemical window

Inactive Publication Date: 2011-09-28
SOUTH CHINA NORMAL UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Due to the low boiling point, flammability, and easy leakage of the solvent (mainly containing carbonate) in the organic liquid electrolyte used in lithium-ion power batteries, the safety of the battery is low, and the interaction between the solvent and the electrode and the electrochemical reaction (such as electrolyte decomposition) , the formation of lithium dendrites, and the destruction of the electrode structure) lead to small specific energy and short life of the battery, so there are serious safety hazards
In addition, lithium-sulfur batteries have serious problems such as low utilization of positive active materials and poor cycle performance due to the small molecule lithium-sulfur compounds, which are the discharge products of positive active materials, are easily soluble in traditional organic liquid electrolytes, thus restricting the commercialization of lithium-sulfur batteries. process

Method used

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  • Porous polymer electrolyte supporting membrane material, preparation method thereof and application thereof
  • Porous polymer electrolyte supporting membrane material, preparation method thereof and application thereof

Examples

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Embodiment 1

[0035] 10% by mass percentage of polyacrylonitrile (PAN) / polymethyl methacrylate (PMMA) (the mass ratio of the two is 8:2,) powder dissolved in 90% by mass of N-N dimethylformamide ( DMF), vigorously stirred at 60 °C for 24 h to obtain a homogeneous polymer solution. Under the action of a 15kV high-voltage DC power supply, the polymer solution is sprayed out in the form of a jet at the end of the capillary of the syringe. The distance between the end of the capillary and the collector is 15cm. Reticular fibers; the electrospun reticular fibers obtained above were vacuum-dried at 80° C. to obtain a porous polymer electrolyte support membrane material: the average fiber diameter was 200 nm, and the porosity was 80%.

[0036] 2.87g LiN(SO 2 CF 3 ) 2 , 6.66g PY 13 TFSI and 3.34g PEGDME prepared 1mol / kg LiN(SO 2 CF 3 ) 2 +PY 13 TFSI+PEGDME (PY 13 TFSI:PEGDME=2:1, weight ratio) electrolyte. In a glove box filled with argon, the porous polymer electrolyte support membrane m...

Embodiment 2

[0041] Dissolve 8 mass percent polyacrylonitrile (PAN) / polyvinyl acetate (PVAc) (6:4, mass ratio) powder in 92 mass percent tetrahydrofuran (THF), and stir vigorously at 60°C 24h to obtain a homogeneous polymer solution. The solution is under the action of a 10kV high-voltage direct current power supply, and the polymer solution is sprayed out in the form of a jet at the end of the capillary of the syringe. The distance between the end of the capillary and the collector is 10 cm. Vacuum drying at ℃ to obtain a porous polymer electrolyte supporting membrane material: the average fiber diameter is 400nm, and the porosity is 70%.

[0042] 0.3g LiPF 6 , 9g PP 13 0.2mol / kg LiPF prepared by TFSI and 1g TEGDME 6 +PP 13 TFSI+TEGDME (PP 13 TFSI:TEGDME=9:1, weight ratio) electrolyte. In a glove box full of argon, the porous polymer electrolyte support membrane material obtained above was immersed in 0.2mol / kg LiPF 6 +PP 13 TFSI+TEGDME (PP 13 TFSI:TEGDME=9:1, weight ratio) in th...

Embodiment 3

[0044] Dissolve 8 mass percent polyacrylonitrile (PAN) / L-polylactic acid (PLLA) (7:3, mass ratio) powder in 92 mass percent dimethyl sulfoxide (DMSO) at 60°C Stir vigorously for 24 h to obtain a homogeneous polymer solution. Under the action of a 20kV high-voltage direct current power supply, the polymer solution sprays out in the form of a jet at the end of the capillary of the syringe, and the distance between the end of the capillary and the collector is 20 cm. Vacuum drying at ℃ to obtain a porous polymer electrolyte supporting membrane material: the average fiber diameter is 300nm, and the porosity is 75%.

[0045] 3.44g LiN(SO 2 CF 3 ) 2 , 5g PP 14 TFSI and 5g DOL prepared 1.2mol / kg LiN(SO 2 CF 3 ) 2 +PP 14 TFSI+DOL(PP 14 TFSI:DOL=1:1, weight ratio) electrolyte. In a glove box filled with argon, the porous polymer electrolyte support membrane material obtained above was immersed in 1.2mol / kg LiN(SO 2 CF 3 ) 2 +PP 14 TFSI+DOL(PP 14 TFSI:DOL=1:1, weight rati...

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Abstract

The invention discloses a porous polymer electrolyte supporting membrane material and a lithium sulphur battery gel polymer electrolyte made of the same. A preparation method for the gel polymer electrolyte comprises the following steps of: dissolving a polymer blend in a solvent so as to form a uniform polymer solution, carrying out electrical spinning on the polymer solution so as to obtain reticular fibers, drying the reticular fibers in vacuum so as to obtain the porous polymer electrolyte supporting membrane material, and immersing the supporting membrane material in an ionic liquid type electrolyte so as to obtain the gel polymer electrolyte. The porous polymer electrolyte supporting membrane material has the advantages of controlled and uniformly distributed pore size, higher porosity and liquid absorption rate; compared with the common electrolyte of the lithium sulphur battery, the prepared lithium sulphur battery gel polymer electrolyte has the advantage of greatly improving the utilization rate of anode active materials and the stability of battery circulation; and the technology is simple, has low requirements for operation and environments and provides a simple, convenient and practical condition for technology production.

Description

technical field [0001] The invention relates to a porous polymer electrolyte supporting membrane material and its preparation method and application, belonging to the technical field of chemical power sources. Background technique [0002] Environmental pollution and energy crisis have attracted widespread attention from all over the world. With the increasing demand for green energy, lithium-ion batteries have attracted more and more attention, especially the development of lithium-ion batteries for electric vehicles has become a research hotspot in the field of chemical power sources in recent years. The theoretical specific capacity of elemental sulfur is 1672mAh / g, and when assembled with lithium to form a battery, the theoretical specific energy can reach 2600Wh / kg, and sulfur has the characteristics of extensive sources and non-toxicity. Therefore, lithium-sulfur batteries have become one of the most valuable and promising secondary power lithium batteries due to thei...

Claims

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Application Information

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IPC IPC(8): D04H1/72D01D5/00H01M10/0565
CPCY02E60/12Y02E60/10
Inventor 饶睦敏李小平廖友好李伟善
Owner SOUTH CHINA NORMAL UNIVERSITY
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