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A kind of molybdenum disulfide/nitrogen-doped carbon nanofiber composite material and its preparation method and application

A technology of nanofibers and molybdenum disulfide, which is applied in the field of energy storage materials, can solve the problems of hindering the effective transmission of electrolyte, the decrease of cycle stability, and the attenuation of specific capacity, so as to achieve the advantages of intercalation and extraction reactions, high specific capacity, and increased The effect of the flow of electrons

Active Publication Date: 2019-07-23
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to its high surface energy, interlayer van der Waals interaction and poor electrical conductivity, pure MoS 2 Nanoparticles are prone to serious stacking and agglomeration during the charging and discharging process, which hinders the effective transport of the electrolyte, which in turn leads to a sharp attenuation of its specific capacity and a sharp drop in cycle stability.

Method used

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  • A kind of molybdenum disulfide/nitrogen-doped carbon nanofiber composite material and its preparation method and application
  • A kind of molybdenum disulfide/nitrogen-doped carbon nanofiber composite material and its preparation method and application
  • A kind of molybdenum disulfide/nitrogen-doped carbon nanofiber composite material and its preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0034] (1) Add 0.6g of polymethyl methacrylate and 0.3g of ammonium thiomolybdate into 10mL of N,N-dimethylformamide and stir for 120min. After uniformity, the spinning stock solution is obtained and set aside;

[0035] (2) Add the spinning stock solution in (1) to the syringe and carry out electrospinning under the conditions of a voltage of 15kV, a receiving distance of 15cm, and a bolus injection speed of 0.1mm / min to obtain polymethyl methacrylate / sulfur Ammonium molybdate nanofibers;

[0036] (3) drying the obtained fibers in an oven at 60°C, and then treating them with a plasma surface cleaner for 10 minutes to obtain fibers with better hydrophilicity;

[0037] (4) preparation concentration is the hydrochloric acid aqueous solution of 1M, with this solution preparation 0.03M ferric chloride hydrochloric acid solution and 0.03M pyrrole hydrochloric acid solution each 500mL, 0.25g fiber film is put into pyrrole / hydrochloric acid solution and soaks 60min;

[0038](5) Add t...

Embodiment 2

[0044] (1) Add 0.6g of polymethyl methacrylate and 0.6g of ammonium thiomolybdate into 10mL of N,N-dimethylformamide and stir for 120min. After uniformity, the spinning stock solution is obtained and set aside;

[0045] (2) Add the spinning stock solution in (1) to the syringe and carry out electrospinning under the conditions of a voltage of 15kV, a receiving distance of 15cm, and a bolus injection speed of 0.1mm / min to obtain polymethyl methacrylate / sulfur Ammonium molybdate nanofibers;

[0046] (3) drying the obtained fibers in an oven at 60°C, and then treating them with a plasma surface cleaner for 10 minutes to obtain fibers with better hydrophilicity;

[0047] (4) preparation concentration is the hydrochloric acid aqueous solution of 1M, with this solution preparation 0.03M ferric chloride hydrochloric acid solution and 0.03M pyrrole hydrochloric acid solution each 500mL, 0.25g fiber film is put into pyrrole / hydrochloric acid solution and soaks 60min;

[0048] (5) Add ...

Embodiment 3

[0052] (1) Add 0.6g of polymethyl methacrylate and 0.3g of ammonium thiomolybdate into 10mL of N,N-dimethylformamide and stir for 120min. After uniformity, the spinning stock solution is obtained and set aside;

[0053] (2) Add the spinning stock solution in (1) to the syringe and carry out electrospinning under the conditions of a voltage of 15kV, a receiving distance of 15cm, and a bolus injection speed of 0.1mm / min to obtain polymethyl methacrylate / sulfur Ammonium molybdate nanofibers;

[0054] (3) drying the obtained fibers in an oven at 60°C, and then treating them with a plasma surface cleaner for 10 minutes to obtain fibers with better hydrophilicity;

[0055] (4) preparation concentration is the hydrochloric acid aqueous solution of 1M, with this solution preparation 0.05M ferric chloride hydrochloric acid solution and 0.05M pyrrole hydrochloric acid solution each 500mL, 0.25g fiber film is put into pyrrole / hydrochloric acid solution and soaks 60min;

[0056] (5) Add ...

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Abstract

The invention relates to a molybdenum disulfide / nitrogen-doped carbon nanofiber composite material and a preparation method and an application thereof. The composite material is of a pipe sleeving structure, a molybdenum disulfide fiber core is arranged in the composite material and a nitrogen-doped carbon nanofiber shell is arranged outside the composite material; and a gap is arranged between the molybdenum disulfide fiber core and the nitrogen-doped carbon nanofiber shell. The preparation method comprises the steps of dissolving ammonium thiomolybdate and polymethyl methacrylate into a solvent and carrying out electrostatic spinning to obtain a polymethyl methacrylate / ammonium thiomolybdate nanofiber; carrying out drying and surface treatment, immersing the nanofiber into a pyrrole / hydrochloric acid solution, dropwise adding a ferric chloride / hydrochloric acid solution and carrying out in-situ polymerization to obtain the fiber coated with polypyrrole on the surface; and washing and drying the fiber, carrying out high-temperature reduction under the condition of taking an argon / hydrogen mixed gas as a protective atmosphere and then carrying out high-temperature carbonization under an argon condition. The composite material has high specific capacity and good cycle stability, and can be used as an efficient and safe novel negative electrode material of a lithium-ion battery.

Description

technical field [0001] The invention belongs to the technical field of energy storage materials, in particular to a molybdenum disulfide / nitrogen-doped carbon nanofiber composite material and its preparation method and application. Background technique [0002] With the increasingly serious problems of global environmental pollution and energy shortage, the development and utilization of high-efficiency fuel cells and secondary batteries is imminent. Lithium-ion batteries are considered to be one of the high-performance batteries that can best meet the sustainable development requirements of the future society due to their advantages such as large operating voltage window, high specific capacity, good safety, no memory effect, small self-discharge, and no environmental pollution. Lithium-ion batteries are composed of four parts: positive electrode, negative electrode, electrolyte and separator. As one of the key components, the negative electrode material greatly affects th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525
CPCH01M4/366H01M4/5815H01M4/625H01M10/0525Y02E60/10
Inventor 张超周宇刘天西缪月娥伏璀玫
Owner DONGHUA UNIV