Lithium sulfur battery membrane material and application thereof

A lithium-sulfur battery and separator material technology, applied in the field of electrochemical batteries, can solve the problem that the diffusion of polysulfides in lithium-sulfur batteries cannot be well inhibited, the thickness, strength, and porosity are difficult to take into account, and the high temperature resistance and high current charge-discharge performance It has the advantages of alleviating lithium dendrite piercing ability, low cost of raw materials, and simple production process.

Inactive Publication Date: 2017-06-13
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the energy density of today's commercial lithium-ion batteries is limited by traditional cathode materials (LiCoO 2 , LiMn 2 o 4 、LiFePO 4 etc.) and the limitation of the theoretical capacity of the carbon anode material itself, it can only reach 150-200 Wh kg -1
350-400 Wh kg -1 It is close to the limit of the energy density of lithium-ion batteries, and it is difficult to further improve
[0005] As a separator material, it must have certain porosity, flexibility, shrinkage, wettability and ionic conductivity. At present, most of the commonly used lithium-sulfur battery separators are traditional olefin separators, mainly polypropylene (PP) microporous membranes. , polyethylene (PE) microporous membrane and multi-layer composite diaphragm (PP/PE two-layer composite or PP/PE/PP three-layer composite) produced by Celgard. The production cost of po

Method used

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  • Lithium sulfur battery membrane material and application thereof
  • Lithium sulfur battery membrane material and application thereof
  • Lithium sulfur battery membrane material and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The preparation method of coating the sulfur cathode material on the current collector is the same as that in Comparative Example 1.

[0028] Metal lithium sheet is used as the negative electrode, Ketjen black and binder polyvinylidene fluoride (PVDF) are mixed at a mass ratio of 9:1, and N-methyl-2-pyrrolidone (NMP) is used as solvent, and then coated on poly propylene microporous membrane Celgard 2400, and then dried in a drying oven at 60 °C for 12 h to serve as a functional separator. Nanoscale Ketjen Black is uniformly loaded on a polypropylene microporous membrane Celgard 2400, such as image 3 a. The thickness of the functional membrane is 7.5 um, such as image 3 b. Use 1 mol L -1 LiTFSI and 0.2mol L -1 LiNO 3 / DOL+DME (dioxolane and ethylene glycol dimethyl ether, volume ratio 1:1) is a lithium-sulfur battery with a functional separator assembled as an electrolyte, such as figure 2 .

[0029] The functional separator coated with Ketjen Black can phys...

Embodiment 2

[0031] The preparation method of coating the sulfur cathode material on the current collector is the same as that in Comparative Example 1.

[0032] Metal lithium sheet is used as the negative electrode, nano-scale titanium dioxide, Ketjen black and binder polyvinylidene fluoride (PVDF) are mixed at a mass ratio of 7:2:1, and N-methyl-2-pyrrolidone (NMP) is used as the solvent, stirring After being evenly coated on polypropylene microporous membrane Celgard 2400, and then dried in a drying oven at 60 °C for 12 h, it was used as a functional separator. The nanoscale titanium dioxide composite material is uniformly supported on the polypropylene microporous membrane Celgard 2400, such as image 3 c. The thickness of the functional membrane is 7.5 um, such as image 3 d. Titanium, oxygen, and carbon are uniformly dispersed on the polypropylene microporous membrane Celgard 2400, such as image 3 e-h. Use 1 mol L -1 LiTFSI and 0.2 mol L -1 LiNO 3 / DOL+DME (dioxolane and et...

Embodiment 3

[0035] Mesoporous carbon / sulfur is used as the positive electrode active material, mixed with the conductive agent acetylene black, and the binder polyvinylidene fluoride (PVDF) at a mass ratio of 6:3:1, and N-methyl-2-pyrrolidone (NMP) is used as the The solvent was stirred evenly and coated on the aluminum foil of the current collector, and then dried in a vacuum oven at 60 °C for 12 h, as the positive electrode material.

[0036] Metal lithium sheet is used as the negative electrode, nano-scale titanium dioxide, Ketjen black and binder polyvinylidene fluoride (PVDF) are mixed in a mass ratio of 7:2:1, and N-methyl-2-pyrrolidone (NMP) is used as a solvent, stirring After being evenly coated on polypropylene microporous membrane Celgard 2400, and then dried in a drying oven at 60 °C for 12 h, it was used as a functional separator. Use 1 mol L -1 LiTFSI and 0.2 mol L -1 LiNO 3 / DOL+DME (dioxolane and ethylene glycol dimethyl ether, volume ratio 1:1) is a lithium-sulfur ba...

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Abstract

The invention relates to a lithium sulfur battery membrane material and application thereof. The membrane material is obtained by smearing a mixed slurry of a catalyst, a conductive agent and a binder on the surface of polypropylene and then conducting drying, and is in a micrometer grade; the catalyst is metal oxide, metal nitride, metal sulfide or a metal simple substance; the conductive agent is acetylene black, ketjen black or a carbon nanotube; the binder is polyvinylidene fluoride, polyvinylidene difluoride, polyethylene oxide or polyacrylic acid. The conductive agent and the catalyst are all in the micrometer grade. The membrane can effectively stop polysulfide ions from diffusing from a negative electrode, so that the polysulfide ions aggregate on the surface on the membrane, and the catalyst can activate the polysulfide ions, and improve the actual specific capacity and the cycling stability. The lithium sulfur battery prepared by adopting the lithium sulfur battery membrane material has the advantages of being high in performance, long in service life and high in safety.

Description

technical field [0001] The invention relates to a functional diaphragm and its application in lithium-sulfur batteries, belonging to the field of electrochemical batteries. Background technique [0002] With the continuous development of science and technology and society, people's demand for new energy continues to increase. Emerging markets such as electric vehicles and smart grids have put forward higher requirements for new energy systems, especially in the field of electric vehicles. The energy density of power batteries is required to reach 500 Wh kg -1 above. However, the energy density of today's commercial lithium-ion batteries is limited by traditional cathode materials (LiCoO 2 , LiMn 2 o 4 、LiFePO 4 etc.) and the limitation of the theoretical capacity of the carbon anode material itself, it can only reach 150-200 Wh kg -1 . 350-400 Wh kg -1 It is close to the limit of the energy density of lithium-ion batteries, and it is difficult to further improve it. ...

Claims

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Application Information

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IPC IPC(8): H01M2/14H01M2/16H01M10/052H01M50/403H01M50/411H01M50/417H01M50/431H01M50/491H01M50/494H01M50/497
CPCH01M10/052H01M50/40H01M50/409H01M50/411H01M50/446H01M50/449Y02E60/10
Inventor 窦辉徐桂银张校刚
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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