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Method for synthesizing molybdenum selenide/nitrogen doped carbon rod via solid-phase co-heating

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

Active Publication Date: 2019-03-15
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • Method for synthesizing molybdenum selenide/nitrogen doped carbon rod via solid-phase co-heating
  • Method for synthesizing molybdenum selenide/nitrogen doped carbon rod via solid-phase co-heating
  • Method for synthesizing molybdenum selenide/nitrogen doped carbon rod via solid-phase co-heating

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 a molybdenum selenide / nitrogen doped carbon rod via solid-phase co-heating. The composite material consists of molybdenum selenide and a nitrogen doped carbon rod; the molybdenum selenide and the nitrogen doped carbon rod are compound through a covalent bond effect; a two-dimensional nano tablet layer of the molybdenum selenide grows along the surface of the one-dimensional carbon rod so as to form a graded tablet rod-shaped structure. The molybdenum selenide / nitrogen doped carbon rod is used as a lithium ion battery cathode material; when thecurrent density is 100 mAg-1, the first charging / discharging reversible capacity of the composite material is 928 mAhg-1; and after carrying out cycle for 100 times, the capacity can be maintained at906 mAhg-1, and the capacity retention rate is as high as 97.6%. The material has favorable rate capability; when the current density is 1000 mAg-1, the reversible capacity can be up to 560 mAhg-1. When the current density is restored from 1000 mAg-1 to 100 mAg-1, the reversible capacity can be restored to 920 mAhg-1 while excellent cycling stability is kept.

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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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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