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Antimony pentasulfide-based material as well as preparation method and application thereof

An antimony pentasulfide-based and antimony pentasulfide technology is applied in the field of antimony pentasulfide-based materials for potassium ion batteries and their preparation, which can solve the problems of not being able to release superior electrochemical performance, and improve the electrochemical reaction activity. , convenient for large-scale production, and the effect of good electrochemical potassium storage performance

Pending Publication Date: 2022-08-02
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the existing antimony pentasulfide material cannot release its superior electrochemical performance when used in the negative electrode of a potassium ion battery, and to provide a kind of antimony pentasulfide-based material for a potassium ion battery and its preparation Methods and Applications

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  • Antimony pentasulfide-based material as well as preparation method and application thereof
  • Antimony pentasulfide-based material as well as preparation method and application thereof
  • Antimony pentasulfide-based material as well as preparation method and application thereof

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preparation example Construction

[0030] A preparation method of antimony pentasulfide-based material, comprising the following steps:

[0031] Step 1: Dissolve dimethylimidazole and cobalt nitrate hexahydrate in a solvent, preferably methanol, then mix the two solutions evenly, and let stand. The standstill temperature is preferably room temperature. The time is preferably 12-24h, and then the obtained precipitate is collected by centrifugation, washed and dried to obtain the metal-organic cobalt material ZIF-67;

[0032] The mass ratio of described dimethylimidazole and cobalt nitrate hexahydrate is preferably 3.24:1.43;

[0033] Step 2: The metal organic cobalt material ZIF-67 obtained in step 1 is placed in a tube furnace in an inert atmosphere for annealing treatment to obtain CoNC co-doped carbon material; the temperature of the annealing treatment is 500-650 ° C , the annealing time is 1-3h, and the heating rate is 5 degrees per minute.

[0034] The diameter of the prepared cobalt-nitrogen co-doped ca...

Embodiment 1

[0041] Step 1: Dissolve 3.24g of dimethylimidazole and 1.43g of cobalt nitrate hexahydrate in 100ml of methanol solution respectively, then mix the two solutions evenly, stand at room temperature for 24h, and then collect, wash and dry the obtained precipitate by centrifugation. Obtain metal organic cobalt material (ZIF-67);

[0042] Step 2: The ZIF-67 obtained in step 1 is placed in a tube furnace in an inert atmosphere for annealing treatment at 650° C. for 2 hours (the heating rate is 5 degrees per minute) to obtain a cobalt-nitrogen co-doped carbon material, abbreviated as CoNC;

[0043] Step 3: Weigh 0.2g CoNC material (300nm in diameter) and 0.3g antimony pentasulfide (50-150nm in size) in a low-energy planetary ball mill according to a mass ratio of 2:3 to obtain a premixed material;

[0044] Step 4: According to the mass ratio of 50:1, the ball milling beads made of zirconium dioxide are weighed and mixed with the above premixed materials. The ball milling time is 48h ...

Embodiment 2

[0048] The preparation method and conditions are the same as in Example 1, the difference is: in step 3, CoNC and Sb 2 S 5 Replace the ratio of 0.1g: 0.4g, and the rest of the operations are the same to obtain Sb 2 S 5 / CoNC 0.1 The composite anode material was used to investigate the effect of different ratios on the performance of the composite material.

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Abstract

The invention provides an antimony pentasulfide-based material as well as a preparation method and application thereof, and relates to the field of potassium ion battery negative electrodes. The method comprises the following steps: placing a cobalt-nitrogen co-doped carbon material and antimony pentasulfide in a ball milling tank to obtain a premixed material; and mixing the premixed material and the ball-milled beads to obtain the antimony pentasulfide-based material. The invention also provides the antimony pentasulfide-based negative electrode material obtained by the preparation method. The invention also provides an application of the antimony pentasulfide-based negative electrode material as a negative electrode material in a potassium ion battery. The electrochemical reaction activity of antimony pentasulfide is effectively improved through introduction of cobalt, the conductivity of the whole material is improved through the defect formed by nitrogen doping, and meanwhile agglomeration and pulverization of active substances caused by volume expansion are relieved through the dispersion effect of a carbon matrix on antimony pentasulfide; the initial coulombic efficiency, the conversion reaction reversibility and the cycling stability of the material are greatly improved through the combined action of the components. The mechanical ball milling method is simple and easy to implement, and large-scale production is facilitated.

Description

technical field [0001] The invention relates to the field of negative electrode materials for potassium ion batteries, in particular to an antimony pentasulfide-based material for potassium ion batteries and a preparation method and application thereof. Background technique [0002] The shortage of lithium resources and the growing demand for electricity storage in society force people to look for new alternative energy storage materials. Potassium-ion batteries (PIBs) have been widely used in energy storage research in recent years due to their abundant potassium resources in the crust, similar redox capabilities to metallic lithium, and low cost. In the research on the negative electrode of potassium ion battery, carbon-based materials, alloy materials, metal sulfides and oxide materials are mainly used, but these materials have slow electrochemical kinetics and serious volume expansion during the process of potassium deintercalation. , the low efficiency of the first cou...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/583H01M10/054
CPCH01M4/362H01M4/5815H01M4/583H01M10/054H01M2004/027Y02E60/10
Inventor 程勇张冬玉尹东明王春丽梁飞吴耀明王立民
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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