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Interlayer material and preparation method and application thereof

An interlayer material and reaction technology, which is used in electrical components, battery electrodes, non-aqueous electrolyte batteries, etc., can solve the problems of insufficient polysulfide contact, slow lithium ion migration, and insufficient conductivity of carbon materials. Liquid storage and ion migration, shortening the lithium ion transmission path, and facilitating the effect of industrial large-scale production applications

Active Publication Date: 2020-07-28
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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  • Interlayer material and preparation method and application thereof
  • Interlayer material and preparation method and application thereof
  • Interlayer material and preparation method and application thereof

Examples

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Effect test

Embodiment 1

[0068] This embodiment provides a method for preparing a sandwich material, including the following steps:

[0069] (1) Dissolve 3.2 mol of cobalt nitrate hexahydrate, 1 mol of ammonium molybdate tetrahydrate and 6 mol of thiourea in 80 mL of deionized water, and stir at room temperature until the solution is clear to obtain a pink solution;

[0070] (2) Dissolve 32 mol of 2-methylimidazole in 80mL of deionized water, stir at room temperature until the solution is clear, and obtain an aqueous solution of 2-methylimidazole;

[0071] (3) Pour the 2-methylimidazole aqueous solution obtained in step (2) into the pink solution obtained in step (1) to obtain a dark purple solution, and let it stand for 24 hours to obtain a preform;

[0072] (4) Suction filtration of the preform obtained in step (3) to remove the supernatant. After dispersing the obtained precipitate in the ethanol / water mixed solution, suction filtration and repeated washing four times until the precipitate completely turns ...

Embodiment 2

[0078] The only difference from Example 1 is that step (1) does not include adding thiourea, and the rest of the composition and preparation method are the same as those of Example 1.

[0079] image 3 In order to obtain the scanning electron microscope image of the starfruit-shaped precursor, from image 3 It can be seen that the particle size of the obtained product is about 4μm, the particle morphology is similar to star fruit, the particles are connected, and the surface is smooth;

[0080] Figure 4 To obtain the scanning electron microscope image of the sandwich material, from Figure 4 It can be seen that the particle size of the obtained product is about 4 μm, the particle morphology is similar to star fruit, the particles are connected, and the surface is rough.

Embodiment 3

[0082] This embodiment provides a method for preparing a sandwich material, including the following steps:

[0083] (1) Dissolve 4mmol of cobalt nitrate hexahydrate, 0.5mmol of ammonium tetrathiomolybdate and 10mmol of thiourea in 80mL of deionized water, and stir at room temperature until the solution is clear to obtain a pink solution;

[0084] (2) Dissolve 10mmol of 1-ethylimidazole in 80mL of deionized water, stir at room temperature until the solution is clear, and obtain an aqueous solution of 1-ethylimidazole;

[0085] (3) Pour the 1-ethylimidazole aqueous solution obtained in step (2) into the pink solution obtained in step (1) to obtain a dark purple solution, and let it stand for 36 hours to obtain a preform;

[0086] (4) Suction filtration of the preform obtained in step (3) to remove the supernatant. After dispersing the obtained precipitate in the ethanol / water mixed solution, suction filtration and repeated washing four times until the precipitate completely turns blue-pu...

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Abstract

The invention provides an interlayer material and a preparation method and application thereof. The preparation method of the interlayer material comprises the following steps: (1) adding cobalt salt,a molybdenum source and an organic compound into water, mixing and reacting to obtain a precursor; (2) performing high-temperature treatment on the precursor obtained in the step (1) to obtain a prefabricated product; and (3) carrying out acid treatment on the prefabricated product obtained in the step (2) to obtain the interlayer material, by adding a molybdenum source in the preparation process, a precursor with a specific carambola-shaped morphology can be obtained; through high-temperature treatment and acid treatment, the carambola-shaped structure is reserved, high graphitization is achieved on the whole, a molybdenum source is evolved into Mo2C, and the porous graphitized carbon material loaded with Mo2C / Co particles is obtained. The interlayer material is applied to the lithium-sulfur battery, and the electrochemical performance of the lithium-sulfur battery can be improved.

Description

Technical field [0001] The invention belongs to the field of batteries, and relates to an interlayer material and a preparation method and application thereof, and in particular to an interlayer material, a modified film including the interlayer material, and a preparation method and application thereof. Background technique [0002] Lithium-sulfur (Li-S) batteries have become an ideal choice for next-generation energy storage systems due to their high theoretical capacity of cathode materials (1675mAh / g, which is almost five times the theoretical capacity of current commercial lithium battery cathode materials). Li-S batteries are widely used, which can overcome excessive dependence on fossil energy and reduce exhaust emissions. However, the commercial application of Li-S batteries is hindered by the following challenges: (1) the conductivity of elemental sulfur is poor and the final discharge product Li2S leads to slow electrochemical reaction kinetics and low utilization of ac...

Claims

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Application Information

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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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