MOF-modified cellulose material intermediate layer and preparation method for lithium-sulfur batteries

A lithium-sulfur battery and interlayer technology, applied in the direction of lithium batteries, battery electrodes, fiber chemical characteristics, etc., can solve the problems that the interlayer cannot be self-supporting and independent film formation, the battery energy is unstable, and the structure of the positive plate is damaged, etc., to achieve Improve redox kinetics, increase graphitization degree, and reduce cost

Active Publication Date: 2022-04-26
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, the preparation process of this intermediate layer is cumbersome, and the intermediate layer cannot be self-supporting to form a film independently, and the positive electrode sheet is required as a rigid substrate.
At the same time, coating on the positive electrode sheet may cause damage to the structure of the positive electrode sheet, resulting in unstable energy of the battery during the long cycle.

Method used

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  • MOF-modified cellulose material intermediate layer and preparation method for lithium-sulfur batteries
  • MOF-modified cellulose material intermediate layer and preparation method for lithium-sulfur batteries
  • MOF-modified cellulose material intermediate layer and preparation method for lithium-sulfur batteries

Examples

Experimental program
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Embodiment 1

[0030] 1. Soak bacterial cellulose hydrogel in 5% sodium hydroxide solution, heat to 80 degrees, purify for several hours, and then wash with deionized water until neutral.

[0031] 2. Configure 0.05M Ni(NO 3 ) 2 6H 2 O aqueous solution, the mass ratio to bacterial cellulose is (15-20): 1, and then the purified bacterial cellulose is soaked in the solution for 12 hours.

[0032] 3. Configure 0.4M 2-methylimidazole solution, the molar ratio of nitrogen-containing organic matter (2-methylimidazole) to the metal ion in the transition metal salt is 20:1, pour it into the solution in the previous step, and turn it at 1000 rpm Stir at a high speed for 15-30 minutes, then reduce the speed to 200 rpm, and keep stirring for 24 hours to carry out the self-assembly of Ni-MOF.

[0033] 1.163g of Ni(NO) dissolved in 80ml of water in the present embodiment 3 ) 2 6H 2 O, the quality of nitrogen-containing organic matter 2-methylimidazole is 2.624g, which is used for the modification of...

Embodiment 2

[0040] The preparation process of the intermediate layer of this example is the same as that of Example 1, except that the transition metal salt solution in this example is 0.05M Co(NO 3 ) 2 6H 2 O aqueous solution to obtain the middle layer of cellulose material (Co-CBC).

Embodiment 3

[0042] The preparation process of the intermediate layer of this embodiment is the same as that of Example 1, except that the transition metal salt solution in this embodiment is 0.05M Zn(NO 3 ) 2 6H 2 O aqueous solution to obtain the middle layer of cellulose material (Zn-CBC).

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Abstract

The present invention is an MOF-modified cellulose material intermediate layer for lithium-sulfur batteries and a preparation method thereof. The preparation method comprises the following steps: purifying the bacterial cellulose with a strong alkaline dilute solution, washing it to neutrality, and soaking it in Transition metal salt solution; then pour the soaked solution into nitrogen-containing organic solution to carry out transition metal MOF self-assembly; finally, after the self-assembly product is processed, it is subjected to segmental high-temperature carbonization treatment under a protective atmosphere to obtain a carbon fiber middle layer. The intermediate layer can be directly placed between the positive electrode and the separator, which can effectively alleviate the shuttle effect. At the same time, the introduction of transition metals catalyzes the conversion of polysulfides, improves the redox kinetics in the reaction process, and synergistically improves the efficiency of lithium-sulfur batteries. performance.

Description

technical field [0001] The invention relates to the technical field of lithium-sulfur batteries, in particular to a metal-organic framework (MOF)-modified bacterial cellulose material, which can be used as an intermediate layer for lithium-sulfur batteries to alleviate the shuttle effect and improve battery performance. Background technique [0002] One of several challenging issues currently hindering the development of lithium-sulfur (Li-S) batteries is the shuttle effect caused by soluble polysulfides, which refers to the reduction of sulfur at the positive electrode of lithium-sulfur batteries to soluble polysulfides during discharge. The long-chain polysulfides, polysulfides dissolve in the electrolyte, pass through the separator to the negative electrode, and react with the negative lithium metal, which not only causes irreversible loss of capacity, but also greatly reduces the safety of the lithium negative electrode. In order to solve the above-mentioned "shuttling e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F9/16D01F9/24H01M4/62H01M10/052
CPCD01F9/16D01F9/24H01M4/628H01M10/052Y02E60/10
Inventor 邓齐波李铁胡宁李俊升张志佳
Owner HEBEI UNIV OF TECH
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