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Functional composite membrane for lithium-sulfur battery and preparation method of functional composite membrane

A lithium-sulfur battery and a composite separator technology are applied in the field of functional composite separators and their preparation to achieve the effects of high discharge specific capacity, improved cycle performance, and improved ionic conductivity

Inactive Publication Date: 2015-12-09
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to propose a functional composite separator for lithium-sulfur batteries and a preparation method thereof, so as to solve the above-mentioned problems existing in existing lithium-sulfur batteries

Method used

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  • Functional composite membrane for lithium-sulfur battery and preparation method of functional composite membrane
  • Functional composite membrane for lithium-sulfur battery and preparation method of functional composite membrane
  • Functional composite membrane for lithium-sulfur battery and preparation method of functional composite membrane

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preparation example Construction

[0043] In one example, a method for preparing a composite membrane includes the following steps:

[0044] a) preparing the modification layer material into a uniform slurry;

[0045] b) coating the slurry on the surface of the diaphragm substrate and drying to obtain a composite diaphragm.

[0046] When the slurry contains electronically conductive materials and inorganic oxide materials, the electronically conductive materials and inorganic oxide materials can be proportioned according to their ratio in the composite diaphragm. Commonly used film-forming additives, such as adhesives and / or plasticizers, may also be included in the slurry. In one example, the electronically conductive material and / or inorganic oxide material and the binder are mixed at a mass ratio of 9:1 to 4:1, and dispersed in a solvent, and a uniformly dispersed slurry is obtained by ball milling or mechanical stirring material. The adhesive includes but not limited to one or more of polyvinyl alcohol, ...

Embodiment 1

[0051] 1. Mix 0.5g carbon nanotubes with 0.4gLi (1+x) Al x Ge (2-x) P 3 o 12 Ceramic powder and 0.1g polyethylene oxide are dispersed in anhydrous acetonitrile to prepare a uniform slurry, which is coated on a glass fiber diaphragm by a doctor blade coating method, and a composite diaphragm is obtained after drying;

[0052] 2. Disperse conductive agent acetylene black, sublimated sulfur and binder polyethylene oxide in acetonitrile and mix them uniformly by ball milling, and then dry the sulfur electrode after coating on aluminum foil;

[0053] 3. The composite diaphragm is used as the diaphragm of the battery, the sulfur electrode is used as the positive electrode, and lithium metal is used as the counter electrode to assemble the CR2025 button battery. The electrolyte is added with 0.4 mol / L LiNO 3 0.6 mol / L of LiTFSIDME / DOL. At 0.5C rate, the first charge and discharge curve of the battery is as follows: figure 2 As shown, the first discharge capacity of the battery...

Embodiment 2

[0057] 1. Mix 0.5g acetylene black with 0.4gLi (1+x) Al x Ge (2-x) P 3 o 12 Ceramic powder and 0.1g PVDF are dispersed in NMP to prepare a uniform slurry, which is coated on one side of the polypropylene diaphragm by doctor blade coating method, and the composite diaphragm is obtained after drying;

[0058] 2. Disperse conductive agent acetylene black, sublimated sulfur and binder polyethylene oxide in acetonitrile and mix them uniformly by ball milling, and then dry the sulfur electrode after coating on aluminum foil;

[0059] 3. The composite diaphragm is used as the diaphragm of the battery, the sulfur electrode is used as the positive electrode, and lithium metal is used as the counter electrode to assemble the CR2025 button battery. The electrolyte is added with 0.1 mol / L LiNO 3 1.0 mol / L LiTFSIDME / DOL. Such as Figure 6As shown, the test result of the lithium-sulfur battery using the composite diaphragm is a, and the test result of the lithium-sulfur battery using ...

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Abstract

The invention relates to a functional composite membrane for a lithium-sulfur battery and a preparation method of the functional composite membrane. The composite membrane comprises a membrane for the lithium-sulfur battery and a functional modified layer, wherein the functional modified layer is located on the membrane for the lithium-sulfur battery, and comprises an electronic conductive material and / or inorganic oxides. Compared with the lithium-sulfur battery employing an ordinary battery membrane, the lithium-sulfur battery employing the functional composite membrane with the modified layer has a relatively high specific discharge capacity; the shuttle effect of the lithium-sulfur battery can be suppressed; the coulombic efficiency of the battery is improved; and the cycle performance of the battery is improved.

Description

technical field [0001] The invention relates to a functional composite diaphragm for lithium-sulfur batteries and a preparation method thereof, belonging to the technical field of lithium-sulfur batteries. Background technique [0002] With the continuous improvement of people's requirements for daily electronic consumer products and electric vehicles, it is urgent to develop a battery system with higher energy density. [0003] Sulfur has a very high specific capacity in the electrochemical reaction, calculated according to the 2-electron reaction per mole of S atoms, the specific capacity is as high as 1675mAhg -1 , almost LiFePO 4 ten times. The theoretical energy density of lithium-sulfur batteries is as high as 2600Wh Kg - 1 . In addition, the cost of raw materials for the production of lithium-sulfur batteries is low, and there are very few substances harmful to the environment during use, and there is no oxygen precipitation in the overcharged state, which has ob...

Claims

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Application Information

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IPC IPC(8): H01M2/14H01M2/16H01M10/052H01M50/403H01M50/414
CPCH01M10/052H01M50/446H01M50/403Y02E60/10
Inventor 温兆银王清松郭静靳俊谷穗吴相伟
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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