Application of porous ion conducting membrane in lithium-sulfur battery

A technology of ion-conducting membranes and lithium-sulfur batteries, which is applied to battery components, circuits, electrical components, etc., can solve the problems of difficulty, limitation, and poor fluidity in the preparation of nanofiltration and below membranes, and achieve high energy conversion efficiency and Cycling stability, achieving controllability, broadening the effect of diaphragm materials

Active Publication Date: 2016-01-06
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, for most membrane materials (such as polyvinylidene fluoride, polyether ether ketone, polysulfone, polyacrylonitrile, polyimide), it is relatively easy to prepare microfiltration membranes by immersion precipitation phase inversion, while the preparation Nanofiltration and below membranes are more difficult
Because for most membrane materials, increasing the concentration of the casting solution is the only way to reduce the pore size, but when the concentration of the casting solution is too high, its fluidity is too poor and it is difficult to coat and form a film
This limits the preparation of porous membranes of nanometer size and below by the immersion precipitation phase inversion method.

Method used

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  • Application of porous ion conducting membrane in lithium-sulfur battery
  • Application of porous ion conducting membrane in lithium-sulfur battery
  • Application of porous ion conducting membrane in lithium-sulfur battery

Examples

Experimental program
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Embodiment 1

[0027] 1.8 grams of polyvinylidene fluoride with a weight average molecular weight of 50,000 was dissolved in a mixed solvent of 5 ml DMAC and 5 ml sulfolane, and stirred for 12 hours to form a polymer solution, which was spread on a glass plate to form a liquid film. Volatilize the liquid film together with the glass plate on a hot stage at 30°C for 2 hours to remove DMAC. Then the liquid membrane was quickly immersed in 5L of water, and solidified in about 1 minute to form a porous ion-conducting membrane.

[0028] The structure of the membrane is a typical asymmetric porous membrane, which is composed of a dense skin layer and a macroporous support layer. The pore diameter of the membrane skin is about 8-10nm, the porosity is 70%, and the thickness is 20 microns. The macroporous support layer is 40 microns thick, with an average pore size of 5 microns and a porosity of 80%.

[0029] The prepared porous separation membrane was used to assemble a lithium-sulfur battery. The...

Embodiment 2

[0031] Dissolve 2.1 g of polyacrylonitrile in 3 ml of DMAC and 3 ml of sulfolane, stir for 12 hours, spread the resulting polymer solution on a glass plate to form a liquid film, and volatilize the liquid film together with the glass plate on a hot stage at 30°C for 2 hours to remove DMAC. Then quickly immersed in 5L of water to solidify to form a porous ion-conducting membrane.

[0032] The pore diameter of the membrane skin is about 40nm, the porosity is 80%, and the thickness is 60 microns.

[0033] The prepared porous separation membrane was used to assemble a lithium-sulfur battery. The commercial carbon-sulfur composite was used as the positive electrode, the metal lithium sheet was used as the negative electrode, and the tetraglyme solution of 1M lithium trifluoromethanesulfonimide was used as the electrolyte solution. The effective area is 9cm -2 , The discharge rate is 0.05C. The assembled lithium-sulfur secondary battery has a current efficiency of 98% and an energ...

Embodiment 3

[0035] Dissolve 2.3 grams of polysulfone and 0.7 grams of sulfonated polyetheretherketone in 10ml of DMAC, stir for 12 hours, spread the formed polymer solution on a glass plate, and volatilize the liquid film together with the glass plate on a hot stage at 30°C for 2 hours. DMAC. Then quickly immersed in 5L of water, solidified, forming a porous separation membrane. The pore diameter of the membrane skin is about 30nm, the porosity is 80%, and the thickness is 80 microns. The prepared porous separation membrane was used to assemble a lithium-sulfur battery. The commercial carbon-sulfur composite was used as the positive electrode, the metal lithium sheet was used as the negative electrode, and the tetraglyme solution of 1M lithium trifluoromethanesulfonimide was used as the electrolyte solution. The effective area is 9cm -2 , The discharge rate is 0.05C. The assembled lithium-sulfur secondary battery has a current efficiency of 95% and an energy efficiency of 88%. The cur...

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Abstract

The invention relates to an application of a porous ion conducting membrane in a lithium-sulfur battery. The porous ion conducting membrane is a typical asymmetric porous membrane in structure, and is formed by superimposing a dense surface layer and a macroporous support layer; the aperture of the membrane surface layer is about 8-10nm; the porosity is 30%-70%; the thickness is 8-20 microns; the thickness of the macroporous support layer is 10-50 microns; the mean size of holes is 2-5 microns; and the porosity is 50%-80%. The prepared porous ion conducting membrane is applied to the lithium-sulfur battery; the controllability on the current efficiency of the lithium-sulfur battery can be achieved by adjusting the aperture of the membrane; and relatively high energy conversion efficiency and cycling stability are obtained.

Description

technical field [0001] The invention relates to the application of a porous ion-conducting membrane in a lithium-sulfur secondary battery. Background technique [0002] The preparation of porous membranes by immersion precipitation phase inversion technology has important applications in various industrial fields. In the preparation process of porous membranes, the membrane pore size and pore structure have a crucial impact on the performance. There are many ways to control parameters such as pore size and pore structure, including the choice of solvent / non-solvent system, adding pore-forming agents to the casting solution, adding volatile solvents, and adjusting film-forming conditions. Through the regulation of the pore size, the continuous transformation of the membrane pores from the micrometer scale to the nanometer scale and finally to the dense nonporous membrane can be realized. However, for most membrane materials (such as polyvinylidene fluoride, polyether ether k...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M2/18H01M50/403H01M50/414H01M50/463H01M50/491
CPCY02E60/10
Inventor 张洪章张华民李先锋
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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