Polyethyleneimine modified biomass charcoal material and preparation method thereof, and application of polyethyleneimine modified biomass charcoal material to modification of lithium-sulfur battery diaphragm

A technology of polyethyleneimine and biochar, which is applied to battery components, chemical instruments and methods, circuits, etc., can solve the problems of complex synthesis methods, high prices, and difficulty in commercial application, and achieve excellent adsorption performance, Effect of improving adsorption performance and increasing cycle life

Inactive Publication Date: 2018-02-09
BEIJING UNIV OF CHEM TECH
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  • Abstract
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Problems solved by technology

However, these compounds are often expensive and complex, making it difficult to achieve commercial applications

Method used

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  • Polyethyleneimine modified biomass charcoal material and preparation method thereof, and application of polyethyleneimine modified biomass charcoal material to modification of lithium-sulfur battery diaphragm

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Embodiment 1

[0061] Add biochar to 3 mol / L KOH solution, stir and react, then separate solid from liquid, wash biochar with deionized water until neutral, and dry to obtain pretreated biochar. Immerse 1 g of the pretreated biochar in a methanol solution of 5wt.% polyethyleneimine, stir well, and separate the solid from the liquid. The obtained reaction product was washed several times with methanol, and dried at 65° C. to obtain a polyethyleneimine-modified biochar material. Mix polyethyleneimine-modified biochar material with conductive carbon black and gelatin solution at a mass ratio of 8:1:1, and obtain a viscous slurry after ball milling, and coat the slurry on the diaphragm , the coating thickness was controlled at 90 μm; the modified separator was dried and sliced ​​for later use.

[0062] The positive electrode sheet, modified separator, lithium sheet, and nickel foam were assembled into a button battery in a glove box, and the cycle performance test was carried out in the LANDdt ...

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Abstract

The invention provides a polyethyleneimine modified biomass charcoal material and a preparation method thereof, and application of the polyethyleneimine modified biomass charcoal material to modification of a lithium-sulfur battery diaphragm, belonging to the technical field of lithium-sulfur batteries. The polyethyleneimine modified biomass charcoal material is prepared by reacting a biomass charcoal material with polyethyleneimine at room temperature in virtue of an impregnation process and then carrying out washing and drying. Polyethyleneimine has rich amino group and shows powerful capacity in capturing lithium polysulfide. Biomass charcoal has a hierarchical pore structure and a specific surface area of 2000-3000 m<2>/g and can adsorb and store lithium polysulfide. When applied to modification of the lithium-sulfur battery diaphragm, the modified biomass charcoal material can effectively inhibit polysulfide from shuttling back and forth between the positive and negative electrodes of a battery, thereby enhancing the cycle performance of the battery. The invention also discloses a lithium-sulfur battery with a modified diaphragm. The actual specific capacity of the lithium-sulfur battery is obviously improved.

Description

technical field [0001] The invention belongs to the technical field of lithium-sulfur batteries, and in particular relates to a preparation method of a polyethyleneimine-modified biomass carbon material, especially the application in the improvement of lithium-sulfur battery commercial separators. Background technique [0002] The energy crisis is one of the major challenges facing human society today. With the continuous development of new energy and green technology, people have higher and higher requirements for power batteries and mobile power equipment. In this context, it is of great significance to develop a battery with high specific capacity, high stability and environmental friendliness. Due to its high theoretical specific capacity (1675mAh / g) and energy density (2600Wh / kg), abundant active material sulfur reserves, and environmental friendliness, lithium-sulfur batteries have become a new type of battery system with great application prospects. [0003] However...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/342C01B32/324C01B32/372H01M2/14H01M2/16H01M50/403H01M50/411H01M50/414H01M50/431
CPCH01M50/403H01M50/449H01M50/411Y02E60/10
Inventor 黄雅钦于帆
Owner BEIJING UNIV OF CHEM TECH
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