Preparation method and application of transition metal sulfide/nitrogen-sulfur co-doped carbon composite fiber electrode material

A nitrogen-sulfur co-doping, transition metal technology, applied in microscopic fiber electrodes, active material electrodes, nanotechnology for materials and surface science, etc. Complex problems, etc., to achieve excellent electrochemical performance, ease volume expansion, and strong applicability.

Active Publication Date: 2021-04-02
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process is complicated and the process is complicated, and it is difficult to realize the controllable preparation of composite materials

Method used

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  • Preparation method and application of transition metal sulfide/nitrogen-sulfur co-doped carbon composite fiber electrode material
  • Preparation method and application of transition metal sulfide/nitrogen-sulfur co-doped carbon composite fiber electrode material
  • Preparation method and application of transition metal sulfide/nitrogen-sulfur co-doped carbon composite fiber electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The first step is the preparation of electrospinning solution, the specific steps are as follows:

[0038] Dissolve 0.253g of manganese acetylacetonate (0.001mol) in 2mL (1.89g) of N,N-dimethylformamide, then add 0.192g (0.006mol) of sulfur powder and stir at 50°C until the reaction is complete, and finally Add 0.12 g of polyacrylonitrile (Mw=150000) and stir until completely dissolved to form a uniform and viscous spinning solution.

[0039] Second step is the preparation of polyacrylonitrile fiber, concrete steps are as follows:

[0040] Take 2mL of the prepared spinning solution and place it in the electrospinning device (Yunfan DP30 basic type), set the spinning voltage to 10kV, the receiving distance to 15cm, the inner diameter of the electrospinning needle to 0.6mm, and the flow rate of the spinning solution to 1mL / h, collect the fiber cloth received on the aluminum foil for later use.

[0041] The third step is the pre-oxidation and carbonization of polyacrylo...

Embodiment 2

[0045] The first step is the preparation of electrospinning solution, the specific steps are as follows:

[0046] Dissolve 0.263g of zinc acetylacetonate in 2mL of N,N-dimethylformamide solution, then add 0.128g of sulfur powder and stir at 50°C until the reaction is complete, and finally add 0.12g of polyacrylonitrile (Mw=150000) Stir until completely dissolved to form a uniform viscous spinning solution.

[0047] Second step is the preparation of polyacrylonitrile fiber, concrete steps are as follows:

[0048] Take 2mL of the prepared spinning solution and place it in the electrospinning device, set the spinning voltage to 10kV, the receiving distance to 15cm, the inner diameter of the electrospinning needle to 0.51mm, and the flow rate of the spinning solution to 1.5mL / h. The received fibers are collected for later use.

[0049] The third step is the pre-oxidation and carbonization of polyacrylonitrile fibers, the specific steps are:

[0050] The obtained polyacrylonitri...

Embodiment 3

[0053] The first step is the preparation of electrospinning solution, the specific steps are as follows:

[0054] Dissolve 0.256g of nickel acetylacetonate in 2mL of N,N-dimethylformamide solution, then add 0.128g of sulfur powder and stir at 50°C until the reaction is complete, and finally add 0.12g of polyacrylonitrile (Mw=150000) Stir until completely dissolved to form a uniform viscous spinning solution.

[0055] Second step is the preparation of polyacrylonitrile fiber, concrete steps are as follows:

[0056] Take 2mL of the prepared spinning solution and place it in the electrospinning device, set the spinning voltage to 10kV, the receiving distance to 15cm, the inner diameter of the electrospinning needle to 0.6mm, and the flow rate of the spinning solution to 1mL / h. The fibers are collected for later use.

[0057] The third step is the pre-oxidation and carbonization of polyacrylonitrile fibers, the specific steps are:

[0058] The obtained polyacrylonitrile fibers ...

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Abstract

The invention relates to a preparation method and application of a transition metal sulfide / nitrogen-sulfur co-doped carbon composite fiber electrode material. The transition metal sulfide / nitrogen-sulfur co-doped carbon composite fiber is prepared by utilizing the bonding effect of acetylacetone metal salt and sulfur in N, N-dimethylformamide, adopting an electrostatic spinning technology to prepare polymer fiber and carrying out air curing and carbonization in an inert atmosphere. The transition metal sulfide nanoparticles in the composite material are uniformly embedded in the nitrogen-sulfur co-doped carbon composite fiber. The preparation method disclosed by the invention is simple and high in applicability, and the obtained transition metal sulfide / nitrogen-sulfur co-doped carbon composite fiber shows good electrochemical performance when being used as a lithium ion battery negative electrode material, and has a very good application prospect.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries and their preparation, and in particular relates to a transition metal sulfide / nitrogen-sulfur co-doped carbon composite fiber, its preparation method and its application in lithium-ion batteries. Background technique [0002] When transition metal sulfides are used as anode materials for lithium-ion batteries, they have high theoretical specific capacity, are environmentally friendly, have abundant resources, and are low in cost. They are considered to be anode materials with great development prospects. However, transition metal sulfides still have problems such as large volume change, poor conductivity, and slow diffusion of lithium ions during the charge-discharge process. Combining with carbon materials with good conductivity and stable structure is an effective way to solve the above problems. [0003] Electrospinning is a simple method to prepare carbon composite electrode ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/58H01M10/0525B82Y30/00D01F1/10D01F9/22
CPCH01M4/5815H01M4/628H01M4/625H01M10/0525B82Y30/00D01F9/22D01F1/10H01M2004/027H01M2004/021H01M2004/022Y02E60/10
Inventor 王亚平王霞林旭光
Owner HEBEI UNIV OF TECH
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