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A kind of interlayer material and its preparation method and application

A technology of interlayer materials and carbon materials, applied in structural parts, electrical components, battery electrodes, etc., can solve the problems of insufficient contact of polysulfides, slow migration of lithium ions, and insufficient conductivity of carbon materials, so as to facilitate ion migration , shorten the lithium ion transmission path, and facilitate the storage effect

Active Publication Date: 2021-06-15
中科南京绿色制造产业创新研究院 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Despite these advantages, there are still two challenges: first, due to the relatively low crystallinity of graphite, the electrical conductivity of MOF-derived carbon materials is not high enough; second, due to their high surface energy, MOFs-derived carbon materials are Tend to aggregate together, nano-sized particles of MOFs not only lead to slow lithium ion migration but also insufficient contact with dissolved polysulfides

Method used

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  • A kind of interlayer material and its preparation method and application
  • A kind of interlayer material and its preparation method and application
  • A kind of interlayer material and its preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0068] This embodiment provides a method of preparing a sandwich material, comprising the steps of:

[0069] (1) 3.2 mol hexahydrate, 1 mol tetrahydrate mixture ammonium and 6 mol thiourea was dissolved in 80 ml deionized water, and the mixture was stirred at room temperature to clarify to obtain a pink solution;

[0070] (2) 32 mol of 2-methylimidazole was dissolved in 80 mL of deionized water, and the mixture was stirred at room temperature to obtain a solution of 2-methylimidazole.

[0071] (3) Pour the 2-methylimidazole solution obtained by step (2) into the pink solution obtained by step (1), to obtain a deep purple solution, stand for 24 h, to obtain a preform;

[0072] (4) The prepreg obtained by step (3) was removed to remove the supernatant, and the precipitate obtained was dispersed in ethanol / water mixed solution, filtered, washed four times until the precipitate became blue and purple, Placed at 60 ° C for 12 h in a blast drying tank to obtain a coulcous precursor Mo...

Embodiment 2

[0078] The difference from Example 1 is only that step (1) does not include the addition of thiourea, the remaining compositions, and the preparation method are the same as in Example 1.

[0079] image 3 Scanning electron microscope diagram of the resulting arms-like precursor, from image 3 It can be seen that the product particles obtained are about 4 μm, and the granular morphology is similar to the coar, and the particles are connected, the surface is smooth;

[0080] Figure 4 Scanning electron microscope map for obtained laminated materials, from Figure 4 It can be seen that the product particles obtained are about 4 μm, and the granular morphology is similar to the chopper, and there is a connection between the particles, the surface is rough.

Embodiment 3

[0082] This embodiment provides a method of preparing a sandwich material, comprising the steps of:

[0083] (1) 4 mmol hexahydrate glycinate, 0.5 mmol tetrahydemolymomide and 10 mmol thiourea were dissolved in 80 ml of deionized water, and the mixture was stirred at room temperature to clarify, to obtain a pink solution;

[0084] (2) 10 mmol of 1-ethylimidazole was dissolved in 80 ml of deionized water, and the mixture was stirred at room temperature to obtain a 1-ethylimidazole solution;

[0085] (3) Pour the 1-ethylimidazole solution obtained by step (2) into the pink solution obtained by step (1), to obtain a deep purple solution, standing for 36 h, to obtain a preform;

[0086] (4) The prepreg obtained by step (3) was removed to remove the supernatant, and the precipitate obtained was dispersed in ethanol / water mixed solution, filtered, washed four times until the precipitate became blue and purple, Placed at 80 ° C for 12 h in a blast drying tank to obtain a predecessor of...

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Abstract

The invention provides an interlayer material and its preparation method and application. The preparation method of the interlayer material comprises the following steps: (1) adding cobalt salt, molybdenum source and organic compound into water to mix and react to obtain a precursor; (2) ) high-temperature treatment of the precursor obtained in step (1) to obtain a preform; (3) acid treatment of the preform obtained in step (2) to obtain the interlayer material; by adding a molybdenum source during the preparation process, it can A precursor with a specific carambola-like morphology is obtained; through high-temperature treatment and acid treatment, not only the carambola-like structure is retained, but also a high degree of graphitization is achieved as a whole, and the molybdenum source evolves into Mo 2 C, get loaded with Mo 2 Porous graphitized carbon material of C / Co particles; the interlayer material is applied in lithium-sulfur batteries, which can improve the electrochemical performance of lithium-sulfur batteries.

Description

Technical field [0001] The present invention belongs to the field of battery, which relates to a sandwich material and a preparation method thereof, and more particularly to a sandwich material, a modified film including a sandwich material and a preparation method thereof. Background technique [0002] Lithium sulfur (Li-S) batteries have become an ideal choice for next-generation energy storage systems due to their highly positive material theory, (1675mAh / g, almost five times that of existing commercial lithium battery positive electrode material theoretical capacity) has become an ideal choice for next-generation energy storage systems. The LI-S battery is widely used, and overcomes excessive dependence on fossil energy and reduces exhaust emissions. However, commercial applications of Li-S batteries are hindered by the following challenges: (1) elemental sulfur conductivity and final discharge product Li2S causes electrochemical reaction kinetics slowing and leads to low u...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/583H01M4/62H01M10/052
CPCH01M4/366H01M4/38H01M4/583H01M4/625H01M10/052Y02E60/10
Inventor 王宝高一博郑淑敏
Owner 中科南京绿色制造产业创新研究院
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