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

9 Cites 57 Cited by

AI-Extracted Technical Summary

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...

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.

Application Domain

Secondary cellsFilament/thread forming +1

Technology Topic

SolventAbsorption rate +10

Image

Examples

Experimental program(6)

Example Embodiment

[0034] Example 1

[0035] The polyacrylonitrile (PAN)/polymethyl methacrylate (PMMA) powder with a mass percentage of 10% (the mass ratio is 8:2) is dissolved in a 90% mass percentage of NN dimethylformamide ( In DMF), vigorously stir at 60°C for 24 hours to obtain a homogeneous polymer solution. Under the action of 15kV high voltage direct current 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. As the solvent evaporates, the polymer solution is finally obtained on the collector. Mesh fiber; the electrospun mesh fiber obtained above is vacuum dried at 80° C. to obtain a porous polymer electrolyte supporting membrane material: the average fiber diameter is 200 nm and the porosity is 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 supporting membrane material obtained above was immersed in 1mol/kg LiN(SO 2 CF 3 ) 2 +PY 13 TFSI+PEGDME(PY 13 TFSI:PEGDME=2:1, weight ratio) In the electrolyte, the moisture and oxygen content in the glove box is 1ppm, soak for 2 hours to obtain the gel polymer electrolyte.

[0037] According to the mass change before and after the porous polymer electrolyte supporting membrane material is immersed in the electrolyte, the following formula is used to calculate the liquid absorption rate of the porous polymer electrolyte supporting membrane material P=(W-W 0 )/W 0 ×100%, where W and W 0 These are the mass of the film after liquid absorption and the mass of the dry film, respectively, and the liquid absorption rate of the obtained porous polymer electrolyte supporting membrane material is 480%.

[0038] The AC impedance spectrum of the gel polymer electrolyte was measured by the AC impedance method. The frequency range of the measurement was 100kHz to 1Hz, and the amplitude was 5mV. The conductivity of the gel polymer electrolyte δ=D/(S×R), D is the thickness of the polymer electrolyte, S is the area of the polymer electrolyte, and R is the electrolyte bulk impedance of the stainless steel/polymer electrolyte/stainless steel type blocking battery , The conductivity of the gel polymer electrolyte is 3.8×10 -3 S.cm -1.

[0039] The application of the gel polymer electrolyte of the present invention in the preparation of lithium-sulfur batteries, the preparation process of the lithium-sulfur battery is as follows: sequentially press the gel polymer electrolyte into sulfur cathode materials (70% S, 20% C, 10% PVDF), Gel polymer electrolyte and negative electrode material (lithium sheet) are assembled into a 2032 button battery, charged and discharged at 25°C 40mA/g, the first discharge capacity is 1260mAh/g; 35 times discharge capacity is 600mAh/g, the utilization rate of sulfur Keep 36%; and replace the gel polymer electrolyte with ordinary liquid electrolyte (1mol/L LiPF 6 +EC+DMC, the volume ratio of EC:DMC is 1:1), the first discharge capacity is 1080mAh/g; the 50 discharge capacity is 100mAh/g, and the sulfur utilization rate is only 6%; figure 1 Shown. Therefore, the capacity of the lithium-sulfur battery prepared by gel polymer electrolyte is greatly improved compared with the capacity of ordinary liquid electrolyte.

Example Embodiment

[0040] Example 2

[0041] Dissolve 8% by mass polyacrylonitrile (PAN)/polyvinyl acetate (PVAc) (6:4, mass ratio) powder in 92% by mass tetrahydrofuran (THF) and stir vigorously at 60°C A homogeneous polymer solution was obtained in 24 hours. Under the action of a 10kV high-voltage direct current 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 10cm. Vacuum drying at ℃ to obtain a porous polymer electrolyte supporting membrane material: the average fiber diameter is 400 nm and the porosity is 70%.

[0042] 0.3g LiPF 6 , 9g PP 13 0.2mol/kg LiPF prepared with TFSI and 1g TEGDME 6 +PP 13 TFSI+TEGDME(PP 13 TFSI:TEGDME=9:1, weight ratio) electrolyte. Immerse the porous polymer electrolyte supporting membrane material obtained above in 0.2mol/kg LiPF in a glove box filled with argon. 6 +PP 13 TFSI+TEGDME(PP 13 TFSI:TEGDME=9:1, weight ratio) In the electrolyte, the moisture and oxygen content in the glove box is 8ppm, soak for 1 hour to obtain the gel polymer electrolyte: the liquid absorption rate is 410%, and the conductivity is 2.6×10 -3 S.cm -1 (The test method is the same as above), used in a lithium-sulfur battery, the first discharge capacity is 1200mAh/g at 25°C and 40mA/g; the 35 times discharge capacity is maintained at 560mAh/g (the experiment method is the same as above).

Example Embodiment

[0043] Example 3

[0044] Dissolve 8% by mass polyacrylonitrile (PAN)/L-polylactic acid (PLLA) (7:3, mass ratio) powder in 92% by mass dimethyl sulfoxide (DMSO) at 60℃ Stir vigorously for 24 hours to obtain a homogeneous polymer solution. Under the action of the 20kV high voltage direct current 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 20cm. Vacuum drying at ℃ to obtain a porous polymer electrolyte supporting membrane material: the average fiber diameter is 300 nm 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 ratio) In the electrolyte, the moisture and oxygen content in the glove box is 3ppm, soak for 3 hours to obtain the gel polymer electrolyte. The liquid absorption rate is 450%, and the conductivity is 2.8×10 -3 S.cm -1 (The test method is the same as above), assembled into a 2032 button lithium-sulfur battery, the first discharge capacity is 1225 mAh/g at 25°C and 40 mA/g; the 35 times discharge capacity is 603 mAh/g (the experiment method is the same as above).

PUM

Property	Measurement	Unit
Fiber diameter	200.0	nm
Diameter	500.0	nm
Fiber diameter	240.0	nm

Description & Claims & Application Information

We can also present the details of the Description, Claims and Application information to help users get a comprehensive understanding of the technical details of the patent, such as background art, summary of invention, brief description of drawings, description of embodiments, and other original content. On the other hand, users can also determine the specific scope of protection of the technology through the list of claims; as well as understand the changes in the life cycle of the technology with the presentation of the patent timeline. Login to view more.

Similar technology patents

Graphene film and preparation method therefor

ActiveCN105110794ASimple processeasy to operate

Owner:CHANGZHOU FUXI TECH CO LTD

PCr-NHEJ (non-homologous end joining) carrier as well as construction method of pCr-NHEJ carrier and application of pCr-NHEJ carrier in site-specific knockout of bacterial genes

InactiveCN104673816AHigh gene knockout efficiencyeasy to operate

Owner:GUANGDONG MEDICAL UNIV

Classification and recommendation of technical efficacy words

easy to operate

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

AI-Extracted Technical Summary

Problems solved by technology

Abstract

Image

Examples

Example Embodiment

Example Embodiment

Example Embodiment

PUM

Description & Claims & Application Information

Similar technology patents

Graphene film and preparation method therefor

PCr-NHEJ (non-homologous end joining) carrier as well as construction method of pCr-NHEJ carrier and application of pCr-NHEJ carrier in site-specific knockout of bacterial genes

Fluorescence carbon quantum dots, and preparation method and application thereof

Network threat evaluation method based on multi-granularity anomaly detection

Full automatic busbar terminal crimping device and crimping method and terminal crimping machine

Classification and recommendation of technical efficacy words

System and method for information access

Operating mechanism, medical manipulator, and surgical robot system

Lancet device

A method and device for automatic image acquisition

Rapid and non-invasive optical detection of internal bleeding