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Molybdenum disulfide diaphragm of lithium-sulfur battery and preparation method therefor

A molybdenum disulfide, lithium-sulfur battery technology, applied in lithium batteries, battery pack parts, non-aqueous electrolyte batteries, etc., can solve problems such as affecting the gas permeability of the diaphragm, reducing battery capacity, etc., to improve cycle life and low cost , the effect of simple experimental conditions

Inactive Publication Date: 2017-08-18
NORTHWEST NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, after the inorganic substance is coated, it will affect the gas permeability of the separator, thereby reducing the battery capacity

Method used

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  • Molybdenum disulfide diaphragm of lithium-sulfur battery and preparation method therefor
  • Molybdenum disulfide diaphragm of lithium-sulfur battery and preparation method therefor
  • Molybdenum disulfide diaphragm of lithium-sulfur battery and preparation method therefor

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A kind of preparation method of molybdenum disulfide diaphragm of lithium-sulfur battery of the present invention, specific operation process is as follows: take the molybdenum disulfide powder that particle diameter is 0.5-1.2 μ m, refer to literature (H. Tang, J. Wang, H. Yin, H. . Zhao, D. Wang, Z. Tang. Growth of Polypyrrole Ultrathin Filmson MoS 2 Monolayers as High-Performance Supercapacitor Electrodes

[0023] .Adv.Mater.2015, 27, 1117.) method to prepare molybdenum disulfide nanosheets, mix the prepared molybdenum disulfide nanosheets with ethanol at a mass volume ratio of 0.2:1, ultrasonically disperse for 30min at room temperature, and then Suction filtration at a vacuum degree of 0.04Mpa to deposit molybdenum disulfide nanosheets on the surface of the lithium-sulfur battery separator to form a molybdenum disulfide film, and dry in a vacuum oven at 40°C for 16 hours to obtain MoS 2 The thickness of the molybdenum disulfide film in the / Celgard separator is 26...

Embodiment 2

[0025] The mixing mass volume ratio of molybdenum disulfide nanosheets and ethanol is 0.25:1, ultrasonically disperse at room temperature for 35min, and then suction filter at a vacuum of 0.05Mpa; the vacuum drying condition is: dry at 45°C for 15h, and other conditions are the same as in Implementation 1 , the prepared MoS 2 The thickness of the molybdenum disulfide film in the / Celgard separator is 300nm.

Embodiment 3

[0027] The mixing mass volume ratio of molybdenum disulfide nanosheets and ethanol is 0.3:1, ultrasonically disperse at room temperature for 35min, and then filter under a vacuum of 0.06Mpa; the vacuum drying condition is: dry at 50°C for 13h, and other conditions are the same as in Implementation 1. , the prepared MoS 2 The thickness of the molybdenum disulfide film in the / Celgard diaphragm is 245nm.

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Abstract

The invention discloses a molybdenum disulfide diaphragm of a lithium-sulfur battery and a preparation method therefor, belonging to the field of lithium-sulfur batteries. According to the molybdenum disulfide diaphragm of the lithium-sulfur battery, the molybdenum disulfide diaphragm has high lithium conductivity, and is capable of inhibiting the migration of polysulfides between a positive electrode and a negative electrode so as to improve a cycle life of the lithium-sulfur battery. In addition, the high-temperature resistance of molybdenum disulfide is used to improve the overall temperature resistance of the diaphragm; a vacuum filtration method is used to deposit a molybdenum disulfide nanosheet on the surface layer of the lithium-sulfur battery diaphragm; and a relative position of pore size of a funnel on the surface of the molybdenum disulfide diaphragm is relatively small in thickness under the vacuum filtration condition, so that good air permeability can be achieved, and battery capacity is not affected. The MoS2 / Celgard prepared is applied to the lithium-sulfur battery; an electrochemical impedance spectroscopy result shows that the lithium ion conductivity of the MoS2 / Celgard diaphragm is about 2.0*10<-1> mS.cm<-1>, thereby substantially prolonging the cycle life of the lithium-sulfur battery. The whole preparation method is short in process flows, the conditions are simple, the cost is low, and no pollution is caused to the environment, so that a requirement of cleaner production can be achieved.

Description

technical field [0001] The invention belongs to the field of lithium-sulfur batteries, and relates to a preparation method of a lithium-sulfur battery diaphragm. Background technique [0002] Lithium-sulfur battery is a lithium secondary battery with metallic lithium as the negative electrode and elemental sulfur as the positive electrode. It is clean, environmentally friendly and low in cost. In the structure of lithium-sulfur batteries, the separator is one of the key inner components. Its main function is to separate the positive and negative electrodes of the battery, prevent the two electrodes from contacting and short circuit, and also have the function of allowing electrolyte ions to pass through. The performance of the separator determines the interface structure and internal resistance of the battery, which directly affects the capacity, cycle and safety performance of the battery. A separator with excellent performance plays an important role in improving the overa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M10/052H01M50/403H01M50/431
CPCH01M10/052H01M50/431H01M50/403Y02E60/10
Inventor 卢小泉何笑宁星铭李文奇张静王彩荷姚敏张卓越
Owner NORTHWEST NORMAL UNIVERSITY
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