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Solid-phase cothermal synthesis of molybdenum diselenide/nitrogen-doped carbon rods

A technology of nitrogen-doped carbon and molybdenum diselenide, applied in structural parts, electrical components, battery electrodes, etc., can solve the problems of high requirements, high toxicity of hydrazine hydrate, unsafe reducing hydrogen, etc., and achieve good ratio performance effect

Active Publication Date: 2021-05-04
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these synthetic methods have different disadvantages. The high requirements of CVD on vacuum conditions, the unsafety of reducing hydrogen and the high toxicity of hydrazine hydrate are not conducive to the large-scale and low-cost preparation of molybdenum diselenide.

Method used

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  • Solid-phase cothermal synthesis of molybdenum diselenide/nitrogen-doped carbon rods
  • Solid-phase cothermal synthesis of molybdenum diselenide/nitrogen-doped carbon rods
  • Solid-phase cothermal synthesis of molybdenum diselenide/nitrogen-doped carbon rods

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Step 1: Stir and disperse molybdate and aniline in deionized water at a mass ratio of 3:4;

[0034] The second step: the mixed solution obtained in the second step is placed in a 25°C water bath, and a certain amount of hydrochloric acid is slowly added dropwise until white turbidity appears;

[0035] The third step: put the above white turbid solution in a 50°C water bath for 4 hours, filter and wash to obtain a white precipitate;

[0036] Step 4: Ultrasonic disperse the obtained white precipitate in a certain amount of deionized water, add an appropriate amount of ammonium persulfate and hydrochloric acid solution, and place it in a water bath at 0°C to stir for 20 hours to obtain a polymerization product;

[0037] Step 5: Suction filter, wash, and dry the above-mentioned polymerization product, and mix it evenly with an appropriate amount of selenium powder. In an argon atmosphere, raise the temperature to 500°C at a rate of 2°C per minute, and then keep it warm for ...

Embodiment 2

[0041] Step 1: Stir and disperse molybdate and aniline in deionized water at a mass ratio of 3:4;

[0042] The second step: the mixed solution obtained in the second step is placed in a 25°C water bath, and a certain amount of hydrochloric acid is slowly added dropwise until white turbidity appears;

[0043] The third step: put the above white turbid solution in a 50°C water bath for 4 hours, filter and wash to obtain a white precipitate;

[0044] Step 4: Ultrasonic disperse the obtained white precipitate in a certain amount of deionized water, add an appropriate amount of ammonium persulfate and hydrochloric acid solution, and place it in a water bath at 0°C to stir for 20 hours to obtain a polymerization product;

[0045] Step 5: Suction filter, wash, and dry the above-mentioned polymerization product, mix it with an appropriate amount of selenium powder, and in an argon atmosphere, raise the temperature to 600°C at a rate of 2°C per minute and then keep it warm for 3 hours ...

Embodiment 3

[0048] Step 1: Stir and disperse molybdate and aniline in deionized water at a mass ratio of 3:4;

[0049] The second step: the mixed solution obtained in the second step is placed in a 25°C water bath, and a certain amount of hydrochloric acid is slowly added dropwise until white turbidity appears;

[0050] The third step: put the above white turbid solution in a 50°C water bath for 4 hours, filter and wash to obtain a white precipitate;

[0051] Step 4: Ultrasonic disperse the obtained white precipitate in a certain amount of deionized water, add an appropriate amount of ammonium persulfate and hydrochloric acid solution, and place it in a water bath at 0°C to stir for 20 hours to obtain a polymerization product;

[0052] Step 5: Suction filter, wash, and dry the above-mentioned polymerization product, and mix it evenly with an appropriate amount of selenium powder. In an argon atmosphere, raise the temperature to 400°C at a rate of 2°C per minute, and then keep it warm for ...

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Abstract

The invention discloses a method for synthesizing molybdenum diselenide / nitrogen-doped carbon rods with solid phase co-heating. The composite material is composed of molybdenum diselenide and nitrogen-doped carbon rods. Hierarchical sheet rod-like structure. The molybdenum diselenide / nitrogen-doped carbon rod composite material is used as the anode material of lithium-ion batteries, and the current density is 100 mAg ‑1 , its initial charge-discharge reversible capacity is 928 mAhg ‑1 , after 100 cycles, its capacity can be maintained at 906 mAh g ‑1 , The capacity retention rate is as high as 97.6%. The material also has good rate performance, when the current density is 1000 mAg ‑1 , its reversible capacity can reach 560 mAhg ‑1 . When the current density is from 1000 mAg ‑1 Return to 100 mAg ‑1 , its reversible capacity can be restored to 920 mAhg ‑1 And still maintain excellent cycle stability.

Description

technical field [0001] The invention relates to a solid-phase cothermal synthesis method of molybdenum diselenide / nitrogen-doped carbon rods, belonging to the field of nanomaterial preparation. Background technique [0002] The most widely used energy storage devices are supercapacitors and lithium-ion batteries. Lithium-ion battery is a secondary battery (rechargeable battery) that mainly relies on lithium ions to move between positive and negative electrodes to work. Due to the characteristics of high voltage, low self-discharge, no memory effect, and high capacity, lithium batteries have been widely used in small mobile devices such as mobile phones and notebook computers. However, limited by the low power density, lithium batteries are still far from meeting the requirements of large-scale power batteries for continuous high-current discharge. Therefore, how to improve the performance of lithium-ion batteries is a current research hotspot, which has far-reaching and gre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/58
CPCH01M4/36H01M4/364H01M4/58Y02E60/10
Inventor 付永胜王佳瑜汪信郭彤李亚南李嘉峥
Owner NANJING UNIV OF SCI & TECH
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