Nitrogen-sulfur co-doped VSe2/CNF potassium ion battery cathode material and preparation method thereof

A nitrogen-sulfur co-doping, battery negative electrode technology, applied in battery electrodes, negative electrodes, secondary batteries and other directions, can solve the problems of slow volume expansion of potassium ion de-intercalation kinetics, restrict development and other problems, achieve excellent electrochemical performance, Inexpensive and highly maneuverable effects

Active Publication Date: 2019-08-30
FUJIAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this electrode material is prone to severe volume expansion during cycling and the kinetics of potassium ion deintercalation is relatively slow, which restricts its further development.

Method used

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  • Nitrogen-sulfur co-doped VSe2/CNF potassium ion battery cathode material and preparation method thereof
  • Nitrogen-sulfur co-doped VSe2/CNF potassium ion battery cathode material and preparation method thereof
  • Nitrogen-sulfur co-doped VSe2/CNF potassium ion battery cathode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 1) Weigh 5 g of chicken feathers into a beaker, pour 50 ml of acetone into the beaker, and ultrasonicate for 30 min, then put it in 100 o Dried in the oven of C, cut the chicken feathers (about 5 mm) and pulverized to obtain powder. Then it was dissolved with 3wt% NaOH at 90 o C under microwave hydrothermal digestion reaction for 1 hour. The solution obtained by hydrothermal degradation was placed in a lyophilizer at -40 o C After freeze-drying, use a mortar to grind to obtain a solid powdery polypeptide, which is used as a nitrogen-sulfur precursor for future use.

[0033] 2) Take 0.5 g PAN and 0.5 g VO(acac) 2 , dissolved in 10 mL of N,N-dimethylformamide to form a mixed solution. Take 0.2 g nitrogen-sulfur precursor powder and add 60 o C in warm water, stirred for 30 min, slowly added to the above mixed solution, stirred for 24 h to obtain a spinning solution.

[0034]3) Transfer the spinning solution obtained above into a syringe, set the spinning voltage to 2...

Embodiment 2

[0038] 1) Weigh 5 g of pig hair into a beaker, pour 50 ml of acetone into the beaker, and ultrasonicate for 30 min, then put it in 100 o Dry in the oven of C, cut the pig hair into pieces (about 5 mm) and pulverize to obtain powder. Then with 2wt% NaCO 3 which dissolves at 100 o C under microwave hydrothermal digestion reaction for 1 hour. The solution obtained by hydrothermal digestion was placed in a lyophilizer at -40 o C After freeze-drying, use a mortar to grind to obtain a solid powdery polypeptide, which is used as a nitrogen-sulfur precursor for future use.

[0039] 2) Take 0.5 g PAN and 0.5 g VO(acac) 2 , dissolved in 10 mL of N,N-dimethylformamide to form a mixed solution. Take 0.3 g nitrogen-sulfur precursor powder and add 60 o C in warm water, stirred for 30 min, slowly added to the above mixed solution, and stirred for 24 h to obtain a spinning solution.

[0040] 3) Transfer the spinning solution obtained above to a syringe, set the spinning voltage to 22 k...

Embodiment 3

[0044] 1) Weigh 5 g of human hair fiber into a beaker, pour 50 ml of acetone into a beaker and ultrasonicate for 30 min, then put it in 100 o Dry in the oven of C, cut the human hair fiber into pieces (about 5 mm) and pulverize to obtain powder. Then it was dissolved with 1 mL of 20 wt% concentrated ammonia water at 120 o C under microwave hydrothermal digestion reaction for 0.8 hours. The solution obtained by hydrothermal digestion was placed in a lyophilizer at -40 o C After freeze-drying, grind with a mortar to obtain a solid powdery polypeptide, which is used as a nitrogen-sulfur precursor for future use.

[0045] 2) Take 0.5 g PAN and 0.5 g VO(acac) 2 , dissolved in 10 mL of N,N-dimethylformamide to form a mixed solution. Take 0.5 g nitrogen-sulfur precursor powder and add 60 o C in warm water, stirred for 30 min, slowly added to the above mixed solution, and stirred for 24 h to obtain a spinning solution.

[0046] 3) Transfer the spinning solution obtained above to...

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Abstract

The invention discloses a nitrogen-sulfur co-doped VSe2 / CNF potassium ion battery cathode material and a preparation method thereof. The method is characterized in that keratin is extracted from pig hair, cow hair, wool, poultry feathers or human hair fiber and is doped into PAN / VO(acac)2 compound as a main source of nitrogen and sulfur, and the nitrogen-sulfur co-doped VSe2 / CNF potassium ion battery cathode material is produced through spinning and selenization. The result shows that the potassium ion battery cathode material exhibits superior potassium storage performance. The method is advantaged in that the operation process is simple, conditions are controllable, excellent structural properties of the VSe2 / CNF carbon composites facilitate deintercalation of the potassium ion battery,the animal hairs and the like are utilized as raw materials, green and environmental protection and resource cycle are achieved, high value utilization of waste resources is achieved, co-doping of nitrogen and sulfur provides more active sites for the electrode material itself, the transport of ions and electrons is facilitated, and thereby electrochemical performance is improved.

Description

technical field [0001] The invention belongs to the field of potassium ion battery materials, in particular to a nitrogen-sulfur co-doped VSe 2 / CNF potassium ion battery negative electrode material and preparation method thereof. Background technique [0002] The depletion of fossil energy and its non-renewability have brought about environmental pollution and energy crisis, and there is an urgent need for electrodes with excellent storage capacity and fast kinetics to meet the needs of electrical energy storage devices. However, limited lithium resources cannot meet the needs of energy storage. Potassium, which is in the same main group as lithium, is chemically similar to lithium and has abundant reserves. At the same time, it has a lower standard reduction potential, a wider voltage window, a smaller electronegativity, and a weaker solvent force. , making potassium-ion batteries have better dynamic performance than lithium-ion batteries and sodium-ion batteries, and ha...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/583H01M10/054D01F8/18
CPCD01F8/18H01M4/362H01M4/581H01M4/583H01M10/054H01M2004/027Y02E60/10
Inventor 曾令兴许丽洪罗奋强钱庆荣陈庆华黄宝铨肖荔人刘淑婷陈婷
Owner FUJIAN NORMAL UNIV
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